BruMate v. Frost Buddy: Patent Infringement Case Dismissed With Prejudice
BruMate, Inc. asserted US11772873B2 — covering insulated drinkware technology — against Frost Buddy LLC’s Universal Buddy and Universal Buddy XL products. After 400 days of litigation in the Southern District of Illinois, the parties filed a Joint Stipulation of Dismissal with Prejudice, ending the dispute with each side bearing its own fees and costs.
Drinkware patent dispute ends in mutual dismissal after 400 days
BruMate, Inc., a Colorado-based insulated drinkware brand, filed suit against Frost Buddy LLC on August 26, 2024, in the U.S. District Court for the Southern District of Illinois before Judge Nancy J. Rosenstengel. BruMate asserted US11772873B2, a utility patent directed to insulated drinkware holder technology, alleging that Frost Buddy’s Universal Buddy and Universal Buddy XL products infringed that patent. BruMate was represented by Reichel Stohry Dean LLP, while Frost Buddy retained Lewis Rice LLC.
The case closed on September 30, 2025, following the filing of a Joint Stipulation of Dismissal with Prejudice on September 26, 2025 (Doc. 36), entered under Federal Rule of Civil Procedure 41(a)(1)(A)(ii). The dismissal with prejudice bars BruMate from reasserting the same claims against Frost Buddy on the same patent. Notably, the order specifies that each party bears its own fees and costs, suggesting the resolution was negotiated rather than litigated to judgment.
A 400-day lifespan from filing to dismissal is consistent with a case resolved prior to trial — potentially through a licensing agreement, design-around, or commercial settlement — though the public record does not confirm the specific terms. The mutual fee arrangement and joint nature of the stipulation suggest neither party conceded liability publicly. What drove the resolution — whether commercial pressure, claim scope negotiations, or a licensing deal — remains undisclosed.
Filing to Dismissed with Prejudice in 400 days
400 days from filing to dismissal — consistent with pre-trial settlement or negotiated resolution in district court IP disputes
Dismissed with prejudice: what the joint stipulation means for both parties
Rule 41(a)(1)(A)(ii): dismissal by joint stipulation
Under FRCP 41(a)(1)(A)(ii), parties may dismiss an action by filing a signed stipulation without requiring court approval. Dismissal ‘with prejudice’ is the parties’ own choice here — it operates as a final adjudication on the merits, permanently barring BruMate from re-filing the same infringement claims against Frost Buddy on US11772873B2 in any federal court.
Res judicata effect appliesBruMate’s rights: enforcement window on this claim closes permanently
By agreeing to dismissal with prejudice, BruMate permanently forfeits the right to re-litigate these specific infringement claims against Frost Buddy. However, BruMate retains ownership of US11772873B2 and may still assert it against other alleged infringers. The with-prejudice designation likely reflects a negotiated resolution rather than a concession that no infringement occurred.
Patent remains enforceable vs. third partiesFrost Buddy gains permanent protection from this specific lawsuit
Frost Buddy secures a res judicata bar against BruMate re-asserting the same US11772873B2 claims over the Universal Buddy and Universal Buddy XL products. Whether Frost Buddy agreed to modify its products, took a licence, or simply negotiated a clean exit is not disclosed. The each-side-bears-costs structure suggests Frost Buddy avoided any damages or fee exposure in the public record.
No damages recorded on public docketDrinkware IP landscape: US11772873B2 remains a live competitive threat
The dismissal resolves this dispute but does not invalidate US11772873B2. Competitors in the universal-fit insulated drinkware segment — particularly those selling products that adapt to multiple cup sizes — should treat this patent as an active enforcement risk. BruMate’s willingness to litigate for 400 days signals ongoing commercial interest in protecting the technology, even where individual disputes resolve privately.
Patent active — monitor for new filingsFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Brumate, Inc. | Company | Insulated drinkware brand — holder of US11772873B2 covering universal-fit drinkware insulatorsSearch in Eureka ↗ |
| Defendant | Frost Buddy LLC | Company | Drinkware accessories brand — maker of the Universal Buddy and Universal Buddy XL insulator productsSearch in Eureka ↗ |
| Plaintiff counsel | Bradley Mark Stohry | Attorney | Counsel for Brumate, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Mark Reichel | Attorney | Counsel for Brumate, Inc.Search in Eureka ↗ |
| Plaintiff law firm | Reichel Stohry Dean LLP | Law Firm | Representing Brumate, Inc.Search in Eureka ↗ |
| Defendant counsel | Michael J Hartley | Attorney | Counsel for Frost Buddy LLCSearch in Eureka ↗ |
| Defendant counsel | Michael J. Hickey | Attorney | Counsel for Frost Buddy LLCSearch in Eureka ↗ |
| Defendant counsel | Michael L. Jente | Attorney | Counsel for Frost Buddy LLCSearch in Eureka ↗ |
| Defendant law firm | Lewis Rice LLC | Law Firm | Representing Frost Buddy LLCSearch in Eureka ↗ |
| Defendant law firm | Lewis Rice LLC (St Louis) | Law Firm | Representing Frost Buddy LLCSearch in Eureka ↗ |
| Presiding judge | Judge Nancy J. Rosenstengel | Judge | Illinois Southern District CourtSearch in Eureka ↗ |
Official order — verbatim text
The court’s order is ministerial in form, entered pursuant to the parties’ Joint Stipulation rather than after judicial fact-finding. The operative phrase — ‘DISMISSED with prejudice’ — carries significant legal weight despite the non-adversarial mechanism: it constitutes a final judgment on the merits for res judicata purposes. The each-party-bears-own-costs clause indicates no Rule 54(d) cost-shifting was sought or awarded, which is consistent with a privately negotiated resolution where neither side wished to litigate the fee question.
US11772873B2 — Universal-fit insulated drinkware holder technology
US11772873B2, filed under application number US17/984840, protects technology relating to insulated drinkware holders designed to accommodate a range of vessel sizes — the core capability marketed in BruMate’s ONYX LEOPARD® product line. The patent’s relatively recent priority date means it carries a substantial remaining term, making it a durable competitive moat in the fast-growing premium insulated accessories segment.
For competitors developing universal-fit can and cup coolers, this patent represents a meaningful clearance risk. The enforcement action against Frost Buddy’s Universal Buddy line — a direct competing SKU — signals that BruMate is actively monitoring the market. Given the broad commercial appeal of multi-size adaptability in drinkware accessories, any brand engineering similar functionality should assess claim scope before committing to a product design.
Should you run an FTO analysis against US11772873B2?
Any brand developing or sourcing universal-fit insulated drinkware products — including can coolers, tumbler holders, or multi-size adapters — should treat US11772873B2 as a priority clearance target. BruMate has demonstrated willingness to litigate, and the patent’s active status with substantial term remaining means exposure is not theoretical. Retailers, OEM manufacturers, and private-label brands are all potentially within scope.
PatSnap Eureka’s FTO Search Agent enables product and IP teams to map US11772873B2’s claim language against your specific product design, identify prior art that may constrain enforceability, and surface related BruMate filings in the same family. Run a full claim-chart analysis before your next drinkware SKU launch to avoid costly post-launch pivots.
Run a freedom-to-operate analysis on US11772873B2 to assess your product’s exposure
Run FTO in Eureka →Similar drinkware and consumer goods patent infringement cases
Explore related patent infringement actions involving insulated drinkware and consumer accessories filed in Illinois and comparable federal district courts.
What this case signals for the insulated drinkware IP landscape
BruMate’s enforcement action against Frost Buddy highlights growing IP assertiveness in the premium drinkware accessories sector.
US11772873B2 is an active enforcement asset — not a paper patent
BruMate filed suit within months of Frost Buddy’s product launch, suggesting active patent monitoring and a low tolerance for perceived infringement. Drinkware accessory brands offering universal-fit or multi-size insulator products should conduct FTO analysis against this patent before launch.
Joint dismissal with prejudice typically signals a private resolution
The combination of with-prejudice dismissal and mutual fee-bearing is a hallmark of negotiated exits — licensing, design-around agreements, or market-exit arrangements. Neither party’s public filing discloses terms, but the structure is inconsistent with a pure capitulation by either side.
Brumate v Frost — key questions answered
The case was dismissed with prejudice on September 30, 2025, pursuant to a Joint Stipulation filed by both parties on September 26, 2025. Each party bears its own attorneys’ fees and costs. The dismissal with prejudice permanently bars BruMate from re-filing the same infringement claims against Frost Buddy on US11772873B2.
BruMate asserted US11772873B2 (application number US17/984840), a utility patent covering universal-fit insulated drinkware holder technology. The accused products were Frost Buddy’s Universal Buddy and Universal Buddy XL — multi-size can and cup insulator products.
A dismissal with prejudice operates as a final judgment on the merits. It permanently prevents BruMate from re-asserting the same infringement claims against Frost Buddy on US11772873B2 in any federal court. BruMate retains ownership of the patent and may still enforce it against other parties.
The public record shows a Joint Stipulation of Dismissal with Prejudice with each party bearing its own costs — a structure commonly associated with a negotiated resolution such as a licence or commercial agreement. However, the specific terms of any underlying agreement are not disclosed in the public court filings.
Yes. The dismissal resolves only BruMate’s claims against Frost Buddy. It does not invalidate or limit the enforceability of US11772873B2 against other parties. The patent remains active with substantial term remaining, and BruMate’s enforcement history suggests it continues to monitor the drinkware accessories market for potential infringers.
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