MEMORANDUM OPINION
LEONIE M. BRINKEMA, District Judge.
Before the Court are the parties’ cross-motions for summary judgment [Dkt. Nos. 10 and 22] concerning plaintiff Callaway Golf Company’s (“Callaway”) request to vacate defendant United States Patent and Trademark Office’s (“PTO”) inter partes reexaminations of four of Callaway’s patents. For the reasons stated in this Memorandum Opinion, Callaway’s motion will be denied and defendants’ motion will be granted.
I. Background
A. Statutory and regulatory background
A patent’s validity can be challenged either in a lawsuit filed in federal district court or through a reexamination conducted by the PTO. Congress has created two types of patent reexamination procedures: ex parte and inter partes. Congress created the ex parte reexamination in 1980. Either the PTO on its own initiative, or a third party, can request an ex parte reexamination. 37 C.F.R. § 1.520.
In 1999, Congress created the inter partes reexamination. Unlike an ex parte reexamination, which allows the PTO to initiate a reexamination, an inter partes reexamination must be requested by a third party. When a request for inter partes reexamination is made, the PTO must determine whether a “substantial new question of patentability affecting any claim of the patent concerned is raised by the request.” 35 U.S.C. § 312(a). If the PTO determines that such a question exists, the PTO is required to begin the inter partes reexamination. 35 U.S.C. § 313. After the PTO initiates an inter partes reexamination, the patent owner may submit pleadings that support the patent’s validity. The requestor may 1) submit written comment to the patent owner’s response, 2) appeal an adverse reexamination decision to the Board of Patent Appeals and Interferences (“BPAI”), and 3) brief and argue its position before the board. Cooper Techs. Co. v. Dudas, 2007 WL 4233467, at *1, 2007,U.S. Dist. LEXIS 88046, at *2 (E.D.Va. Nov. 30, 2007), aff'd 536 F.3d 1330 (Fed.Cir.2008).
B. Callaway’s patents and the 1996 settlement agreement
Callaway and its competitor, Acushnet Company (“Acushnet”) manufacture golf balls. Callaway owns U.S. Patent Nos. 6,210,293; 6,503,156; 6,506,130; and 6,595,873 (“Sullivan patents”), which claim a multi-layer golf ball. Pl.’s Statement of Material Facts at ¶ 2.
On August 5, 1996, Acushnet entered into an agreement with Spalding and Evenflow Companies, Inc., Callaway’s predecessor-in-interest, and Lisco, Inc., a wholly owned Spalding subsidiary, to resolve various patent-related claims in various civil actions then pending in the United States District Court for the District of Delaware (Civil Action Nos. 95-CV-366 and 95-CV-640, filed by Spalding and Civil Actions 95-CV-10384 and 95-CV-10376, filed by Acushnet). The agreement contained a “Dispute Resolution” clause, which provides that:
[a]ny dispute arising out of or relating to patents, including the above mentioned patents, other intellectual property owned or controlled by the parties, or claims relating to advertising shall be resolved in accordance with the procedures specified in this Section, which [682]*682shall be the sole and exclusive procedure for the resolution of any such disputes.
A253-55. The agreement requires a series of settlement discussions and mediation. If the dispute is unresolved after mediation, “either party may initiate proceedings but only in the United States District Court for the District of Delaware, and no other. Said court retains jurisdiction of the parties for such purposes.” A256. The Stipulations of Dismissal of the Delaware, cases, filed under Fed.R.Civ.P. 41, stated that the United States District Court for the District of Delaware “shall retain jurisdiction to resolve any and all disputes arising out of the Settlement Agreement in accordance with the terms of the Settlement Agreement.” A258-59.
Problems arose between Callaway and Acushnet over Acushnet’s Titleist Pro VI line of golf balls, with Callaway alleging in 2005 that these golf balls infringe its Sullivan patents. Throughout 2005, the parties tried to resolve their dispute, but failed to do so. Pl.’s Statement of Material Facts at ¶ 3.
C. Acushnet’s inter partes reexamination request
On January 17, 2006, Acushnet requested that the PTO conduct inter partes reexaminations of Callaway’s Sullivan patents. A2, 2200, 2518, 2819. On April 7, 2006, the PTO determined that Acushnet’s request raised a substantial new question of patentability and accordingly began inter partes reexaminations of the Sullivan patents. A187.1
On April 13, 2006, Callaway filed an administrative petition to vacate the reexaminations, arguing that Acushnet had violated the 1996 settlement agreement by requesting the reexaminations. A231. On June 7, 2006, the PTO denied Callaway’s petition, concluding that the reexamination statute requires the PTO to order and conduct inter partes reexamination when a substantial new question of patentability is found and that an agreement between parties does not relieve the PTO of that statutory duty. A436. The PTO also noted that Congress passed the inter partes reexamination statute in 1999, three years after the parties entered their settlement agreement. Id. Moreover, the PTO concluded that such a contractual provision that prohibits challenges to patent validity would be contrary to public policy, and reasoned that withdrawing the inter partes reexaminations “would leave both the public and the patent owner with an unresolved request for reexamination and unresolved substantial new question of patentability[.]” A437-38.
On June 16, 2006, Callaway filed a petition for reconsideration of the denial of its petition to vacate. A440. On September 7, 2006, the PTO denied the petition for reconsideration. A551. The PTO relied largely on the reasoning of its earlier decision, concluding that Acushnet did not breach the 1996 agreement, and that the agreement does not bind the PTO. Id. The PTO stated that its decision constitutes a “final agency action” under 5 U.S.C. § 704, which would allow Callaway to seek judicial review in federal court; however, Callaway did not seek judicial review and the reexamination continued. A565.
D. Litigation in the United States District Court for the District of Delaware
On February 9, 2006, shortly after Acushnet requested inter partes reexaminations, Callaway sued Acushnet in the [683]*683United States District Court for the District of Delaware, alleging that Acushnet’s Pro VI golf balls infringe the Sullivan patents. Callaway Golf Co. v. Acushnet Co., 1:06cv91 (D.Del.). On October 18, 2006, the Court granted Callaway’s motion to amend the complaint to add a breach of contract claim, which asserted that Acushnet breached the settlement agreement by filing the reexamination requests.
Both parties moved for partial summary judgment as to whether Acushnet had breached the settlement agreement. On November 20, 2007, the Court granted Callaway’s motion and denied Acushnet’s motion, finding that Acushnet “violated the Agreement by filing the inter partes reexaminations to contest the validity of the Sullivan patents.” Callaway Golf Co. v. Acushnet Co., 523 F.Supp.2d 388, 407 (D.Del.2007). On August 12, 2008, Acushnet moved to vacate the breach of contract ruling, arguing that the Delaware district court did not have jurisdiction to enforce the settlement agreement because the Court did not formally “so order” the stipulations of dismissal in 1996. On November 10, 2008, the Court granted Acushnet’s motion, concluding that “[djespite the universal intention for the court to retain jurisdiction over the performance of the Agreement, this intent was not manifested in the court’s order sufficient to confer subject matter jurisdiction to enforce a settlement agreement.” Callaway Golf Co. v. Acushnet Co., 585 F.Supp.2d 592, 599 (D.Del.2008). On June 29, 2009, after Callaway refiled the breach of contract claim in the Delaware Court of Chancery, the parties filed a joint motion to modify the 1996 stipulations of dismissal to allow the Delaware federal court to have jurisdiction. On July 23, 2009, the joint motion was granted, curing the jurisdictional defect. Compl. ¶¶ 71-73. On January 13, 2011, the district court granted Callaway’s motion and reinstated the summary judgment ruling on the breach of contract claim; however, because the court has yet to decide damages, it has not issued a final order and Acushnet is unable to appeal. Id. ¶ 75; Am. Brief at 9.
While the breach of contract issues were being addressed, the patent infringement portion of the Delaware civil action continued. On December 14, 2007, a jury found that all but one of the claims in the Sullivan patents were valid. Acushnet appealed to the United States Court of Appeals for the Federal Circuit, which reversed and remanded the action for a new trial on invalidity. Callaway Golf Co. v. Acushnet Co., 576 F.3d 1331 (Fed.Cir.2009). In March 2010, the retrial of the validity issue resulted in a jury verdict that the Sullivan patents were invalid.2
E. Board of Patent Appeals and Interferences proceeding
While the Delaware litigation continued, the PTO proceeded with the inter partes reexaminations, which concluded with the Examiner finding that certain claims in the Sullivan patents were not patentable. A2168. Callaway appealed that determination to the BPAI, which scheduled a hearing on the appeal for January 19, 2011; however, on January 14, 2011, one day after it prevailed on its breach of contract claim in Delaware, Callaway filed with the BPAI a Petition for Temporary Relief in Light of New Court Decision, in which it sought to postpone the BPAI hearing. A2038.3 On January 18, 2011, [684]*684the Acting Chief Administrative Patent Judge denied Callaway’s petition, holding that the district court decision did not require termination of the reexamination proceedings and that whether the “requester may have breached a contractual obligation ... does not necessarily make the subsequent actions of the USPTO illegal or the proceeding ‘unlawfully initiated.’ ” A2162-2168.
On March 9, 2011, the BPAI affirmed the PTO’s conclusion of unpatentability. A2168-2194. Also that day, the Acting Chief Administrative Patent Judge denied Callaway’s petition to vacate the reexaminations, concluding that the “breach of a settlement agreement by instituting a reexamination proceeding” does not constitute “sufficient cause for vacating the reexamination proceeding.” A2195-99. On April 11, 2011, Callaway filed with the BPAI a request for rehearing of its decision on unpatentability. The request was denied in June 2011.
F. The present litigation
On March 15, 2011, Callaway filed this civil action against David J. Kappos, Under Secretary of Commerce for Intellectual Property and Director of the PTO, the PTO, and the United States, for declaratory and injunctive relief, alleging that the PTO’s failure to vacate, suspend, or stay the inter partes reexaminations was “arbitrary, capricious, an abuse of discretion, or otherwise not in accordance with law” and therefore should be set aside under the Administrative Procedure Act (“APA”), 5 U.S.C. § 706(2). Callaway seeks a declaratory judgment that the PTO’s failure to vacate, suspend, or stay the proceedings violated the APA, and it seeks an injunction vacating the reexaminations and the BPAI’s orders, and barring further participation in any form by Acushnet in inter partes reexaminations of the Sullivan patents. Callaway also seeks a writ of mandamus enjoining the PTO from further proceeding with inter partes reexaminations of the Sullivan patents, or requiring the PTO to stay or suspend the reexaminations until the validity of the patents is finally determined in federal court. Lastly, Callaway seeks to recover the attorney’s fees and costs incurred in this litigation.4
II. Standard of Review
Summary judgment is appropriate where the record demonstrates “that there is no genuine issue as to any material fact and that the moving party is entitled to judgment as a matter of law.” Fed. R.Civ.P. 56(c). A genuine issue of material fact exists “if the evidence is such that a reasonable jury could return a verdict for the nonmoving party.” Anderson v. Liberty Lobby, Inc., 477 U.S. 242, 247-48, 106 S.Ct. 2505, 91 L.Ed.2d 202 (1986). The Court must view the record in the light most favorable to the nonmoving party. See Bryant v. Bell Atl. Md., Inc., 288 F.3d 124, 132 (4th Cir.2002). However, the “mere existence of a scintilla of evidence in support of the [nonmovant’s] position will be insufficient; there must be evidence on which the jury could reasonably find for the [nonmovant].” Anderson, 477 U.S. at 252, 106 S.Ct. 2505. Thus, if a nonmoving party bears the burden of proof on a claim at trial, the moving party may prevail on its Rule 56 motion by showing that there is a lack of evidence to carry the other party’s burden as to any essential element of the cause of action. See Celotex Corp. v. Catrett, 477 U.S. 317, 322-23, 106 S.Ct. 2548, 91 L.Ed.2d 265 (1986). Once the moving party has met its burden of demonstrating the absence of an issue of material fact, the party opposing summary judgment may not rest on mere allegations or inferences, but must instead proffer [685]*685specific facts or objective evidence showing that a genuine issue of material fact exists requiring further proceedings. Matsushita Elec. Indus. Co. v. Zenith Radio Corp., 475 U.S. 574, 586, 106 S.Ct. 1348, 89 L.Ed.2d 538 (1986).
The APA, 5 U.S.C. § 701 et seq., confines judicial review of executive branch decisions to the administrative record of proceedings before the pertinent agency. See 5 U.S.C. § 706; see also Camp v. Pitts, 411 U.S. 138, 142, 93 S.Ct. 1241, 36 L.Ed.2d 106 (1973). As such, there can be no genuine issue of material fact in an APA action; rather, it is the legal questions presented in the civil action that are ripe for resolution on cross-motions for summary judgment. See Am. Forest Res: Council v. Hall, 533 F.Supp.2d 84, 89 (D.D.C.2008) (quoting Occidental Eng’g Co. v. INS, 753 F.2d 766, 769-70 (9th Cir.1985)) (“[I]t is the role of the agency to resolve factual issues to arrive at a decision that is supported by the administrative record, whereas ‘the function of the district court is to determine whether or not as a matter of law the evidence in the administrative record permitted the agency to make the decision it did.’ ”).
III. Discussion
A. Jurisdiction
In an amicus brief, Acushnet argues that the PTO’s denial of the petitions to vacate the inter partes reexaminations are not subject to judicial review because the PTO’s determination that a substantial new question of patentability exists is “final and non-appealable” under 35 U.S.C. § 312(c). Am. Brief at 10.5 Callaway responds that review of the PTO’s denial of a petition to vacate inter partes reexaminations is subject to judicial review because the petition did not dispute whether a substantial new question of patentability exists. Callaway Opp. at 17.
Callaway’s argument is correct. Section 312(c) only exempts from judicial review the PTO’s substantive determination that a reexamination application raises “a substantial new question of patentability.” The statute does not divest the courts of jurisdiction over all decisions related to inter partes reexaminations. See, e.g., Cooper Techs. Co., 2007 WL 4233467, 2007 U.S. Dist. LEXIS 88046 (reviewing whether the PTO should have granted the petition to terminate an inter partes reexamination). Similarly, Callaway’s challenge does not address whether Acushnet’s reexamination applications raised a substantial new question of patentability; instead, Callaway challenges the PTO’s decision that it was not required to terminate the inter partes reexaminations in light of the settlement agreement or the finding in the Delaware litigation that Acushnet had breached that agreement by requesting the inter partes reexamination. Accordingly, this Court has jurisdiction to review the PTO’s denial of the petition to vacate the inter partes reexaminations.
B. Administrative Procedure Act claim
Under the APA, the Court may set aside the PTO’s decisions not to vacate the reexaminations of the Sullivan patents only if those decisions were “arbitrary, capricious, an abuse of discretion, or otherwise not in accordance with law.” 5 U.S.C. § 706(2). This standard does not allow the Court “to substitute its judgment for that of the agency.” Citizens to Preserve Overton Park, Inc. v. Volpe, 401 U.S. 402, 416, 91 S.Ct. 814, 28 L.Ed.2d 136 (1971). The PTO’s denials of Callaway’s petitions to vacate the reexaminations were not arbitrary or capricious because neither the [686]*6861996 settlement agreement to which the PTO was not a party, nor the breach of contract ruling in the Delaware litigation, in which the PTO did not appear, has any binding effect on the PTO.
1. Effect of the 1996 settlement agreement on the inter partes reexaminations
After reviewing the inter partes reexamination statute, the PTO concluded that the 1996 settlement agreement could not abrogate its ability to reexamine the Sullivan patents. The PTO also concluded that a contractual provision that absolutely prohibits reexamination would violate the strong public policy interest in ensuring valid patents. A433-39.
The PTO’s decision is grounded in basic contract law. The 1996 settlement agreement cannot restrict the PTO’s participation in the reexaminations unless the PTO was a party to the agreement. See Showmaker v. Advanta USA, Inc., 411 F.3d 1366, 1369 (Fed.Cir.2005) (stating that a contract’s terms “bind only the parties.”). The PTO was not a party to the 1996 settlement agreement and therefore cannot be bound by any of its provisions.
Moreover, the PTO correctly concluded that the inter partes reexamination statute provides a nondiscretionary duty, requiring the PTO to conduct a reexamination once it receives a request and makes the initial finding that a substantial new question of patentability exists. A436. This conclusion is based on Congress’s inclusion of “shall” in § 313, which provides that “the determination shall include an order for inter partes reexamination[.]” 35 U.S.C. § 313. The word “shall” requires the PTO to begin reexamination. See, e.g., Sierra Club v. Johnson, 541 F.3d 1257, 1265 (11th Cir.2008) (holding that “ ‘shall’ creates a nondiscretionary duty for the Administrator”).
The PTO also argues that the inter partes statute allows “[a]ny” third party to request an inter partes reexamination “at any time,” 35 U.S.C. § 311. The statute does not require the PTO to first determine whether the third-party requester is contractually prohibited from requesting a reexamination, nor does the statute even allow the PTO discretion to consider that issue. Callaway has not cited any caselaw or statute that would allow the PTO to disregard its nondiscretionary duty to begin reexaminations once a third party makes a request and the PTO makes its initial finding.
The PTO also correctly argues that a private contractual agreement that would prohibit reexamination would be contrary to public policy. A437. Patents are government-granted monopolies that provide the patent holders with tremendous power to suppress competition. See American Steel Foundries v. Robertson, 262 U.S. 209, 215, 43 S.Ct. 541, 67 L.Ed. 953 (1923). Accordingly, there is a strong public interest in ensuring that patents are valid. As the Supreme Court held in Lear v. Adkins, 395 U.S. 653, 89 S.Ct. 1902, 23 L.Ed.2d 610 (1969), prohibitions on challenges to patent validity violate public policy which favors “permitting full and free competition in the use of ideas which are in reality part of the public domain.” Id. at 670, 89 S.Ct. 1902. The patent reexamination process helps ensure such full and free competition. Because the purpose of reexaminations “is to correct errors made by the government ... and if need be to remove patents that never should have been granted,” Patlex Corp. v. Mossinghoff 758 F.2d 594, 604 (Fed.Cir.1985), a private contract that prevents reexamination is void as a matter of public policy.
Callaway responds that the PTO’s actions compromise an even stronger policy interest: the need to enforce obligations [687]*687under settlement agreements. Callaway Summ. J. Mot. at 17, citing Flex-Foot, Inc. v. CRP, Inc., 238 F.3d 1362, 1370 (Fed.Cir.2001) (“Settlement agreements must be enforced if they are to remain effective as a means for resolving legal disagreements.”). Although there is a strong public interest in enforcing settlement agreements, that is precisely what the Delaware federal district Court did when it granted Callaway summary judgment on its breach of contract claim. Acushnet may well be liable for damages for that breach. Callaway, however, has cited no caselaw that requires the PTO to independently enforce Callaway’s private contract. Nor has Callaway demonstrated that the public interest in enforcement of settlement agreements outweighs the public interest in patent validity.
Callaway’s argument rests largely on the unsupported assumption that the inter partes reexamination is a judicial proceeding. A review of the statutes, legislative history, and caselaw, however, reveals that the PTO is not a neutral adjudicator in an inter partes reexamination. In both ex parte and inter partes reexaminations, the PTO determines whether it correctly approved the patent during its initial examination of the patent’s application. The statutes creating both ex parte and inter partes reexaminations state that the reexaminations must “be conducted according to the procedures established for initial examination!)]” 35 U.S.C. §§ 305 and 314(a). The Federal Circuit summarized the PTO’s role in reexaminations:
In a very real sense, the intent underlying reexamination is to ‘start over’ in the PTO with respect to the limited examination areas involved, and to reexamine the claims, and to examine new or amended claims, as they would have been considered if they had been originally examined in light of all of the prior art of record in the reexamination proceeding.
In re Etter, 756 F.2d 852, 857 (Fed.Cir.1985). Although In re Etter involved an ex parte reexamination, the PTO’s role is identical in an inter partes proceeding. Congress created the inter paries reexamination “to further encourage potential litigants to use the PTO as [an] avenue to resolve patentability issues without expanding the process into one resembling courtroom proceedings.” 145 Cong. Rec. H6929, H6944 (daily ed. Aug. 3, 1999) (statement of Rep. Rohrabacher). As such, it is clear that the inter partes reexamination is not a judicial proceeding.
At oral argument and in its briefs, Calla-way relied heavily on dicta in Joy Manufacturing Co. v. National Mine Service Co., 810 F.2d 1127 (Fed.Cir.1987) for its argument that a forum selection clause in a contract can prevent reexamination. In Joy Manufacturing, the plaintiff alleged that when the defendant requested a reexamination, the defendant had breached the provision in their contract that provided that the defendant would not “file any suit in any United States Court” contesting the validity of the plaintiffs patents. Id. at 1129. In holding that the literal terms of the settlement agreement did not prohibit the defendant from seeking reexamination because the PTO is not a “United States court,” the Federal Circuit also stated that, “[i]n view of the new reexamination procedure, parties would be well advised to draft agreements, where appropriate, to encompass this new facet of patent law.” Id. at 1130. Callaway argues that this dicta stands for the proposition “that a properly worded forum-selection clause could preclude a reexamination at the PTO.” Callaway Opp. at 7 (emphasis in original). Callaway’s interpretation of Joy Manufacturing is incorrect. Nowhere in the opinion did the Federal Circuit state that a forum selection clause could prevent the PTO from reexamining a patent. To the contrary, the Federal Circuit stated [688]*688that a breach of such a forum selection clause does not require the PTO to cease reexamination:
In this connection, we also note that the principal relief which Joy seeks — namely, stopping the reexamination of its patent — is not available in these proceedings ... The decision by the Commissioner to institute reexamination is not subject to review; and the injunction sought against National would have no effect on reexamination since National, as the requestor, has no future role to play in that ex parte proceeding.
Id. at 1130 (citations omitted). Therefore, Joy Manufacturing does not support the proposition that a forum selection clause can prevent the PTO from conducting a reexamination.
Accordingly, the PTO’s initial denial of Callaway’s request to vacate the reexaminations was not arbitrary, capricious, an abuse of discretion, or otherwise not in accordance with law.
2. Collateral estoppel from, the Delaware proceedings
Callaway’s second line of argument is that the conclusion of the Delaware court as to Acushnet’s violating the settlement agreement collaterally estops the PTO from proceeding with the reexamination. This entire line of argument fails for multiple reasons.
Collateral estoppel prevents “the relitigation of issues of fact or law that are identical to issues which have been actually determined and necessarily decided in pri- or litigation in which the party against whom [collateral estoppel] is asserted had a full and fair opportunity to litigate.” Ramsay v. INS, 14 F.3d 206, 210 (4th Cir.1994), quoting Virginia Hosp. Ass’n. v. Baliles, 830 F.2d 1308, 1311 (4th Cir. 1987).6 For the doctrine to apply, the party asserting it must establish:
(1) the issue precluded must be identical to one previously litigated;
(2) the issue must have been actually determined in the prior proceeding;
(3) determination of the issue must have been a critical and necessary part of the decision in the prior proceeding;
(4) the prior judgment must be final and valid; and
(5) the party against whom estoppel is asserted must have had a full and fair opportunity to litigate the issue in the previous forum.
Ramsay, 14 F.3d at 210.
Obviously, the issue before the PTO was not identical to the issue before the Delaware federal district court, which addressed only whether Acushnet had breached its agreement with Callaway by requesting the reexamination. See Callaway Golf Co. v. Acushnet Co., 523 F.Supp.2d 388, 405 (D.Del.2007) (holding that Acushnet “violated the Agreement by filing the inter partes reexaminations to contest the validity of the Sullivan patents.”). The Delaware court did not hold that the PTO was precluded from conducting reexaminations. In fact, the Delaware court actually recognized the PTO’s authority to proceed with the reexaminations:
The reexamination at issue having been filed, and a substantial new question of patentability recognized, the PTO was clearly within its jurisdiction to dismiss plaintiffs request to halt the proceedings. It does not follow, however, that defendant was not in breach when it filed its inter partes reexamination request in the first instance.
[689]*689Id. at 405. Because the PTO’s decision to reexamine the Sullivan patents is an entirely separate matter from the issue of whether Acushnet breached its contract with Callaway by requesting reexamination, there is not collateral estoppel effect.7
Callaway’s collateral estoppel argument also fails because the PTO was not a party to the Delaware litigation, and the PTO did not have a “full and fair opportunity” to litigate the breach of contract issue in Delaware. Moreover, the Federal Circuit has held that a district court’s rulings in patent infringement lawsuits do not bind the PTO’s later reexamination of the same patents. See In re Trans Tex. Holdings Corp., 498 F.3d 1290, 1298 (Fed.Cir.2007), (affirming the PTO’s refusal to apply a district court’s claim construction to the PTO’s later ex parte reexamination of the same patent, holding that “[i]ssue preclusion is not warranted in this case because the PTO was not a party to the earlier litigation”); Houston Atlas, Inc. v. Del Mar Scientific, Inc., 1982 WL 51051, 1982 U.S. Dist. LEXIS 10046 (N.D.Tex. June 16, 1982) (rejecting patent holder’s argument that alleged infringer’s breach of a consent decree by filing a request for an ex parte reexamination collaterally es-topped the PTO from reexamining the patent, holding that “the Patent Office was not a party to the original proceeding and ... the consent judgment is binding on the Patent Office or the public which it represents”).8
Lastly, the text of the inter partes reexamination statute supports the conclusion that the PTO is not bound by general collateral estoppel principles. The statute contains only a narrow collateral estoppel provision, limited to instances in which a party loses a challenge to patent validity in a civil action or an inter partes reexamination,
then neither that party nor its privies may thereafter request an inter partes reexamination of any such patent claim on the basis of issues which that party or its privies raised or could have raised in such civil action or inter partes reexamination proceeding, and an inter partes reexamination requested by that party or its privies on the basis of such issues may not thereafter be maintained by the Office, notwithstanding any other provision of this chapter[.]
35 U.S.C. § 317(b). Under a statutory interpretation canon, expressio unis est ex-clusio alterius, “where a law expressly describes a particular situation to which it shall apply, what was omitted or excluded was intended to be omitted or excluded.” Reyes-Gaona v. North Carolina Growers Ass’n, 250 F.3d 861, 865 (4th Cir.2001), Congress’s failure to include a more general collateral estoppel provision supports the conclusion that Callaway’s collateral estoppel has no statutory basis.
In addition to invoking collateral estoppel, Callaway tries to rely on section 2646 of the Manual of Patent Examining Procedure (“MPEP”), which allows the PTO to vacate an inter partes reexamination that is ultra vires, such as where there is “no discretion to grant a request for reexamination.” (emphasis in original). Callaway’s Mot. for Summ. J. at 25. This argument fails, however, because it relies [690]*690on the unsupported assumption that the 1996 settlement agreement and the Delaware court’s breach of contract ruling divest the PTO of any statutory authority to reexamine the Sullivan patents. Once again, Callaway cites no easelaw or statutes that would lead to the conclusion that a breach of contract ruling against a third party divests the PTO of any discretion to reexamine patents.
Moreover, Callaway’s MPEP argument is undercut by the PTO’s determination that neither the forum selection clause nor the Delaware court’s ruling renders the PTO’s decision to conduct the reexamination ultra vires. An agency’s interpretation of its own regulations is “controlling unless plainly erroneous or inconsistent with the regulation.” Auer v. Robbins, 519 U.S. 452, 461, 117 S.Ct. 905, 187 L.Ed.2d 79 (1997) (internal citation and quotation marks omitted). At oral argument, counsel for Callaway implied that Auer is no longer good law, alluding to Justice Scalia’s recent statement that he has “become increasingly doubtful” of Auer’s validity. Talk Am., Inc. v. Mich. Bell Tel. Co., — U.S. —, 131 S.Ct. 2254, 180 L.Ed.2d 96 (2011) (Scalia, J., concurring); however, this argument ignores the majority’s opinion, which applied Auer and stated that it has “reaffirmed” the rule. Id., at 2260-61. Therefore, under Auer, we must defer to the PTO’s decision that the reexamination is not ultra vires because the decision is neither plainly erroneous nor inconsistent with the agency’s regulations. It was perfectly reasonable for the PTO to conclude that a court’s finding that one private party breached a contract by requesting reexamination did not divest the PTO of its ability to reexamine the patent. Therefore, under Auer, the Court will defer to the PTO’s interpretation of its regulations.
In sum, Callaway has failed to demonstrate that the PTO’s denial of the petitions to vacate the inter partes reexaminations were “arbitrary, capricious, an abuse of discretion, or otherwise not in accordance with law.” Therefore, Callaway’s request for a declaratory judgment and injunction under 5 U.S.C. § 706(2) will be denied.
C. Mandamus
Although Callaway also seeks a writ of mandamus enjoining the PTO from conducting the reexaminations and requiring the PTO to stay or suspend the reexaminations, it does not address mandamus relief in its Motion for Summary Judgment. Callaway’s reply brief only mentions mandamus briefly in a footnote, stating that the relief is proper “because the PTO is required to vacate proceedings over which it has no statutory authority.” Callaway Reply at 17, n. 11. Callaway cannot satisfy the requisite elements for mandamus. Am. Brief at 27. For a writ of mandamus to issue, the plaintiff must establish: “(1) the plaintiff has a clear right to relief; (2) the defendant has a clear duty to act; and (3) there is no other adequate remedy available to plaintiff.” Burandt v. Dudas, 496 F.Supp.2d 643, 653 (E.D.Va.2007) (internal citations omitted).
Callaway has not demonstrated that it has a clear right to the relief that it seeks. Specifically, it has not pointed to a single statute or binding precedent that would require the PTO to vacate the inter partes reexaminations. Nor has Callaway established that the PTO has a clear duty to vacate the reexaminations. As discussed above, the PTO reasonably construed the settlement agreement and the Delaware court’s decision as not precluding the PTO from conducting the reexaminations.
Finally, Callaway has adequate remedies through the APA. The PTO’s refusal to vacate an inter partes reexamination is subject to judicial review. Moreover, Cal[691]*691laway may also seek judicial review of the PTO’s decision to invalidate the Sullivan patents by appealing to the Federal Circuit under 85 U.S.C. §§ 141 and 315(a)(1). Accordingly, Callaway’s mandamus claim fails.
IV. Conclusion
For all of the above stated reasons, the Motion of Plaintiff Callaway Golf Company for Summary Judgment [Dkt. No. 10] will be denied and Defendants’ Motion for Summary Judgment [Dkt. No. 22] will be granted by an Order to be issued with this Opinion.