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

District Court, N.D. California·Decided January 23, 2026·No. 3:25-cv-00989·Unknown

Opinion

PERPLEXITY SOLVED SOLUTIONS, Case No. 25-cv-00989-JSC INC., Plaintiff, ORDER RE: DEFAULT JUDGMENT v. Re: Dkt. No. 75 PERPLEXITY AI, INC., Defendant.

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

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

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.) — published by Counsel Stack Legal Research, free access to 12M+ legal documents.

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