Perplexity Solved Solutions, Inc. v. Perplexity AI, Inc.; Perplexity AI, Inc. v. Perplexity Solved Solutions, Inc.

CourtDistrict Court, N.D. California
DecidedJanuary 23, 2026
Docket3:25-cv-00989
StatusUnknown

This text of Perplexity Solved Solutions, Inc. v. Perplexity AI, Inc.; Perplexity AI, Inc. v. Perplexity Solved Solutions, Inc. (Perplexity Solved Solutions, Inc. v. Perplexity AI, Inc.; Perplexity AI, Inc. v. Perplexity Solved Solutions, Inc.) is published on Counsel Stack Legal Research, covering District Court, N.D. California primary law. Counsel Stack provides free access to over 12 million legal documents including statutes, case law, regulations, and constitutions.

Bluebook
Perplexity Solved Solutions, Inc. v. Perplexity AI, Inc.; Perplexity AI, Inc. v. Perplexity Solved Solutions, Inc., (N.D. Cal. 2026).

Opinion

1 2 3 4 UNITED STATES DISTRICT COURT 5 NORTHERN DISTRICT OF CALIFORNIA 6 7 PERPLEXITY SOLVED SOLUTIONS, Case No. 25-cv-00989-JSC INC., 8 Plaintiff, ORDER RE: DEFAULT JUDGMENT 9 v. Re: Dkt. No. 75 10 PERPLEXITY AI, INC., 11 Defendant.

12 13 PERPLEXITY AI, INC., Counterclaimant-Plaintiff, 14 v. 15 PERPLEXITY SOLVED SOLUTIONS, INC., 16 Counterclaim-Defendant. 17 18 Perplexity Solved Solutions, Inc. (“PSSI”) sues Perplexity AI, Inc. (“Perplexity”) for 19 trademark infringement, and Perplexity counterclaims for cancellation of PSSI’s trademark 20 registration. (Dkt. Nos. 1, 23.)1 The Court previously granted Perplexity’s motions to strike 21 PSSI’s answer to its counterclaims and enter default, and to dismiss PSSI’s claims with prejudice. 22 (Dkt. No. 70.) Perplexity now moves for default judgment on its counterclaims. (Dkt. No. 75.) 23 Although PSSI has not responded, the Court has carefully considered Perplexity’s submission, 24 concludes oral argument is not required, see N.D. Cal. Civ. L.R. 7-1(b), and GRANTS 25 Perplexity’s motion. Six of seven Eitel factors weigh in favor of entering default judgment against 26 27 1 PSSI on Perplexity’s counterclaims. Perplexity has also alleged cancellation of U.S. Trademark 2 Registration 6,906,290 is proper. 3 BACKGROUND 4 I. PROCEDURAL HISTORY 5 In January 2025, PSSI sued Perplexity for (1) trademark infringement under Lanham Act § 6 32(1), 15 U.S.C. § 1114(1); (2) unfair competition and false design of origin under Lanham Act § 7 43(a), 15 U.S.C. § 1125(a); (3) cybersquatting under Lanham Act § 43(d), 15 U.S.C. § 1125(d); 8 (4) unfair business practices under the California Unfair Competition Law, Cal. Bus. & Prof. Code 9 § 17200; (5) common law trademark infringement and unfair competition; and (6) declaratory 10 judgment under Lanham Act § 2(d), 15 U.S.C. § 1052(d). (Dkt. No. 1.) PSSI alleged its owner 11 Dawn Gallman Mobley “has worked tirelessly to build a successful business and brand under the 12 name PERPLEXITY and variations thereof (collectively, ‘the PERPLEXITY Mark’),” which it 13 registered with the U.S. Patent and Trademark Office (“USPTO”) in 2022. (Id. ¶ 2.) However, 14 according to PSSI, Perplexity has been “using the PERPLEXITY Mark in connection with highly 15 similar software-related goods and services.” (Id. ¶ 3.) 16 Perplexity first moved to dismiss PSSI’s cybersquatting claim, and the Court granted 17 Perplexity’s motion. (Dkt. Nos. 18, 42.) Perplexity also answered PSSI’s complaint and 18 counterclaimed for cancellation of U.S. Trademark Registration No. 6,906,290 (the “’290 19 Registration”) for PSSI’s leaf logo based on (1) fraud on the USPTO under 15 U.S.C. §§ 20 1115(b)(1) and 1119, and (2) for abandonment under 15 U.S.C. §§ 1064(3) and 1119. (Dkt. No. 21 23.) PSSI answered the counterclaims. (Dkt. Nos. 34, 40.) 22 However, on July 18, 2025, Mitchell Silberberg & Knupp LLP and its individual attorneys 23 Eleanor M. Lackman and Marissa B. Lewis moved to withdraw as PSSI’s counsel. (Dkt. No. 50.) 24 Ms. Lewis declared because “there ha[d] been an irreparable breakdown in the attorney-client 25 relationship and that [her] firm [could not] continue to effectively represent [PSSI],” “professional 26 considerations require[d] termination of the representation and the situation [wa]s one in which 27 withdrawal is appropriate.” (Dkt. No. 50-1 ¶ 5.) She also attested that on June 20, 2025, she 1 itself in federal court. (Id. ¶ 3.) 2 On August 5, 2025, the Court granted the motion to withdraw “‘subject to the condition 3 that papers may continue to be served on counsel for forwarding purposes’ until [PSSI] retain[ed] 4 new counsel.” (Dkt. No. 53 at 2 (quoting N.D. Cal. Civ. L.R. 11-5(b)).) The Court warned PSSI 5 because it is a corporation, which “‘may appear in the federal courts only through licensed 6 counsel,’” “failure to retain substitute counsel may result in the entry of default judgment on 7 counterclaims against it . . . and dismissal of its action against [Perplexity].” (Id. at 2-3 (quoting 8 Rowland v. California Men’s Colony, Unit II Men’s Advisory Council, 506 U.S. 194, 202 (1993)).) 9 So, the Court granted PSSI “an additional 30 days to acquire new counsel” and ordered PSSI’s 10 new counsel to “make an appearance by September 5, 2025.” (Id. at 3.) Because no attorney had 11 made an appearance for PSSI by September 11, 2025, the Court continued its September 17, 2025 12 case management conference. (Dkt. No. 57.) In its continuance order, the Court again explained 13 “[PSSI] is a corporation” and cannot appear without licensed counsel, and noted “[Perplexity] may 14 take whatever steps it deems appropriate.” (Id. at 1-2.) In addition, on October 9, 2025, the Court 15 denied Dawn Gallman Mobley’s request for a continuance of court proceedings because she had 16 not yet obtained counsel for PSSI. (Dkt. No. 66.) The Court reiterated its prior warning “if no 17 new counsel appeared in this action, [PSSI’s] claims would have to be dismissed, and [PSSI’s] 18 default could be entered on [Perplexity’s] counterclaims.” (Id. at 1.) 19 Perplexity then moved to strike PSSI’s answer to its counterclaims and direct entry of 20 default, and to dismiss PSSI’s claims with prejudice. (Dkt. Nos. 60, 61.) The Court granted both 21 motions. (Dkt. No. 70.) Perplexity now moves for default judgment on its counterclaims. (Dkt. 22 No. 75.) 23 II. COUNTERCOMPLAINT ALLEGATIONS 24 On October 25, 2021, PSSI applied to the USPTO to register its “Leaf Logo” for “Software 25 as a service (SAAS) services featuring software for data analytics and UI Testing.” (Dkt. No. 23 26 at 20.) Because PSSI filed its application based on actual use under 15 U.S.C. § 1051(a), PSSI 27 submitted a declaration attesting the Leaf Logo was presently in use in commerce, as well as a 1 20-22.) The USPTO granted PSSI’s application and issued the ’290 Registration. (Id. at 22.) 2 However, PSSI’s declaration “the Leaf Logo ‘is in use in commerce and was in use in 3 commerce as of the filing date of the application on or in connection with the goods/services in the 4 application’” was false. (Id.) PSSI’s submitted specimen was also “fraudulent” because it “did 5 not show the mark being used with any actual goods or services—let alone the applied-for services 6 in the application.” (Id.

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Bluebook (online)
Perplexity Solved Solutions, Inc. v. Perplexity AI, Inc.; Perplexity AI, Inc. v. Perplexity Solved Solutions, Inc., Counsel Stack Legal Research, https://law.counselstack.com/opinion/perplexity-solved-solutions-inc-v-perplexity-ai-inc-perplexity-ai-cand-2026.