BrowserKey v. Comerica: Infringement Suit Dismissed With Prejudice in 22 Days
BrowserKey, LLC filed suit in the Eastern District of Texas asserting US7249262B2 against Comerica’s Mobile Banking Application. The case closed just 22 days later when BrowserKey voluntarily dismissed with prejudice — extinguishing its own claims permanently and with each party bearing its own costs.
A 22-Day Infringement Suit That Ended on the Plaintiff’s Own Terms
On April 28, 2025, BrowserKey, LLC filed a patent infringement action against Comerica in the Eastern District of Texas, Case No. 2:25-cv-00444. The suit asserted US7249262B2 — a patent covering browser-based authentication technology — against the Comerica Mobile Banking Application. BrowserKey was represented by Fabricant LLP, a firm well known for asserting patents in the Eastern District of Texas.
On May 20, 2025 — just 22 days after filing — BrowserKey filed a Notice of Voluntary Dismissal with prejudice under Rule 41(a)(1)(A)(i). The court accepted and acknowledged the notice, dismissed all claims with prejudice, denied all pending relief as moot, and directed each party to bear its own costs, expenses, and attorneys’ fees. A dismissal with prejudice means BrowserKey cannot refile the same claims against Comerica on US7249262B2.
A resolution within 22 days strongly suggests the parties reached an agreement — whether a licence, a covenant not to sue, or a settlement — before any substantive litigation activity occurred. No defendant counsel of record appears in the public docket, which is consistent with pre-answer resolution. The precise commercial terms, if any, remain unknown from the public record.
Filing to Voluntary dismissal in 22 days
22 days — well below the median district court patent case duration of 2+ years
Dismissed with prejudice: what the voluntary exit means for both parties
Rule 41(a)(1)(A)(i): plaintiff’s right to unilateral dismissal
Under Rule 41(a)(1)(A)(i), a plaintiff may voluntarily dismiss an action without a court order by filing a notice before the defendant serves an answer or a motion for summary judgment. Here, BrowserKey exercised that right but elected dismissal with prejudice — an unusual choice that permanently bars refiling the same claims against Comerica on this patent.
Plaintiff-initiated, pre-answer exitWith prejudice bars any future assertion of this patent against Comerica
A dismissal with prejudice operates as a final adjudication on the merits. BrowserKey cannot refile infringement claims against Comerica based on US7249262B2. This is meaningfully different from a without-prejudice dismissal, which would leave the door open for future suits. The public record confirms the with-prejudice designation explicitly in the court’s order.
Claims permanently extinguishedComerica exits without admitting liability and bears its own costs
Comerica faces no finding of infringement, no injunction, and no damages award. The court’s order that each party bear its own costs means Comerica received no fee award despite the case’s swift resolution. Comerica retains no exposure to BrowserKey on US7249262B2 going forward, though other patents in BrowserKey’s portfolio are not addressed by this dismissal.
No liability, no fee recoverySwift resolution signals likely pre-litigation agreement
Resolution in 22 days with no defendant counsel of record is consistent with the parties reaching a licence or settlement shortly after filing. For financial institutions operating mobile banking platforms, this case illustrates the speed at which patent assertion entities can extract resolution. The absence of a fee award to Comerica may suggest the outcome involved some form of commercial consideration rather than pure abandonment.
Probable pre-answer resolutionFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | BrowserKey, LLC | Company | Patent assertion entity — holder of US7249262B2 covering browser authenticationSearch in Eureka ↗ |
| Defendant | Comerica | Individual | Comerica — major U.S. commercial bank, operator of the Comerica Mobile Banking ApplicationSearch in Eureka ↗ |
| Plaintiff counsel | Alfred Ross Fabricant | Attorney | Counsel for BrowserKey, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Jacob Daniel Ostling | Attorney | Counsel for BrowserKey, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Peter Lambrianakos | Attorney | Counsel for BrowserKey, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Vincent J. Rubino , III | Attorney | Counsel for BrowserKey, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Fabricant LLP | Law Firm | Representing BrowserKey, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Fabricant LLP (NY) | Law Firm | Representing BrowserKey, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Fabricant LLP (Rye) | Law Firm | Representing BrowserKey, LLCSearch in Eureka ↗ |
| Presiding judge | Judge N/A | Judge | Texas Eastern District CourtSearch in Eureka ↗ |
Official order — verbatim text
The court’s order tracks the statutory language of Rule 41(a)(1)(A)(i) closely, accepting BrowserKey’s notice without requiring judicial adjudication of the merits. The explicit ‘with prejudice’ designation — volunteered by the plaintiff, not imposed by the court — is the operative legal fact. It functions as a merits bar, meaning Comerica holds a permanent shield against re-assertion of US7249262B2 by BrowserKey. The ‘own costs’ directive forecloses any fee-shifting claim by either party under 35 U.S.C. § 285.
US7249262B2 — Browser-based authentication technology for mobile banking
US7249262B2 was filed under application number US10/139924 and covers browser-based authentication technology — specifically methods and systems for managing secure user sessions via a browser interface. This category of technology is foundational to web and mobile banking applications, where session integrity and authentication reliability are core security requirements. The patent’s claims are likely directed to the logical flow of credential verification and session token handling rather than hardware-specific implementations.
For financial institutions, US7249262B2 represents the type of broadly applicable authentication patent that can be asserted against a wide range of mobile and web banking platforms. The Comerica Mobile Banking Application was the named product in this case, but similar assertion logic could apply to any bank or fintech operating app-based login flows. Patent assertion entities targeting financial services infrastructure frequently deploy authentication patents because the underlying methods are deeply embedded in standard development stacks and difficult to design around without architectural changes.
Should your mobile banking team run an FTO against US7249262B2?
Any bank, credit union, or fintech operating a mobile application with browser-based or token-based authentication should treat US7249262B2 as a live FTO concern. The fact that BrowserKey filed against a major commercial bank — and resolved the case before any substantive defence was mounted — suggests the patent’s claim scope is either genuinely broad or perceived as sufficiently credible to warrant licensing discussions. R&D and product teams implementing login, session management, or credential flows should document their design choices against the patent’s independent claims.
PatSnap Eureka’s FTO Search Agent can map the claims of US7249262B2 against your product’s authentication architecture, identify prior art that may support invalidity arguments, and surface parallel litigation involving the same patent or Fabricant LLP-associated entities. This equips your legal team to assess exposure before a demand letter arrives rather than after.
Run a freedom-to-operate analysis on US7249262B2 to assess your product’s exposure
Run FTO in Eureka →Similar patent infringement cases: mobile banking and browser authentication
Explore related patent infringement actions in the Eastern District of Texas involving browser authentication, mobile banking applications, and financial services technology.
What this case signals for the mobile banking and fintech IP landscape
A 22-day patent suit in the Eastern District of Texas involving mobile banking authentication warrants scrutiny from any financial institution running app-based services.
Eastern District of Texas remains a preferred venue for PAE filings against banks
BrowserKey, represented by Fabricant LLP, chose the Eastern District of Texas — a historically plaintiff-friendly forum. Financial institutions with no established Texas presence should assess their venue exposure when operating mobile applications accessible in that district.
Pre-answer resolution extinguishes claims but not broader portfolio risk
A with-prejudice dismissal on US7249262B2 protects Comerica from this specific patent. But BrowserKey’s broader portfolio remains unaddressed. Any bank or fintech that has received a demand letter citing similar authentication patents should conduct an FTO before assuming resolution of one suit closes all exposure.
BrowserKey v Comerica — key questions answered
In BrowserKey v. Comerica (2:25-cv-00444), the dismissal with prejudice means BrowserKey permanently extinguished its own infringement claims against Comerica based on US7249262B2. BrowserKey cannot refile the same claims. The court accepted the notice under Rule 41(a)(1)(A)(i) and directed each party to bear its own costs.
BrowserKey asserted US7249262B2 (application no. US10/139924), a patent covering browser-based authentication technology. The accused product was the Comerica Mobile Banking Application. The case was filed in the Eastern District of Texas on April 28, 2025 and closed May 20, 2025.
The public record does not disclose the reason for the rapid resolution. However, a 22-day timeline with no defendant counsel of record is consistent with pre-answer settlement, a licence agreement, or a covenant not to sue reached shortly after filing. The with-prejudice nature of the dismissal suggests a negotiated exit rather than pure case abandonment.
No. The dismissal with prejudice protects only Comerica from future assertion of US7249262B2 by BrowserKey. Other financial institutions or fintech companies have no preclusive benefit from this order. They remain exposed to potential assertion of US7249262B2 or related patents and should conduct their own FTO analysis.
BrowserKey was represented by Fabricant LLP, with attorneys of record including Alfred Ross Fabricant, Jacob Daniel Ostling, Peter Lambrianakos, and Vincent J. Rubino III. Fabricant LLP is a patent litigation firm frequently associated with Eastern District of Texas infringement actions on behalf of patent assertion entities.
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