Untitled case

Baby Jogger, LLC initiated a patent infringement lawsuit against Monahan Products, LLC, doing business as UPPAbaby, in the U.S. District Court for the District of Massachusetts (Case No. 1:24-cv-11582). Baby Jogger, the plaintiff, is an operating company known for manufacturing and selling strollers and related accessories. UPPAbaby, the defendant, is also an operating company that designs and markets juvenile products, including a line of strollers. The core of the dispute revolves around UPPAbaby's stroller product lines, which Baby Jogger alleges infringe its patents, specifically those related to removable seat attachments for strollers. The case is currently assigned to Judge Allison Dale Burroughs.

The asserted patents include US Patent 11,505,231 and at least US Patent 11,878,729, among other patents mentioned as dealing with "removable seat attachments for strollers." While a detailed one-line technical sketch for all asserted patents isn't fully explicit in the search results, the patents generally pertain to stroller designs, particularly mechanisms for attaching and detaching seats. The case is currently in an advanced procedural posture, with a Markman hearing (claim construction hearing) having already taken place in the District of Massachusetts case for UPPAbaby, though a ruling has not yet been issued, and no trial date has been calendared.

This litigation is notable for several reasons. It is part of a broader enforcement effort by Baby Jogger, which has filed similar lawsuits against other competitors, including Evenflo Co. Inc. and Baby Generation, Inc., d/b/a Mockingbird, in the District of Delaware, asserting different variations of seven different patents across these cases. The presence of parallel inter partes review (IPR) proceedings at the Patent Trial and Appeal Board (PTAB) further highlights the contested nature of the patents, with UPPAbaby and other defendants challenging the validity of Baby Jogger's patents. The District of Massachusetts, while not historically one of the busiest patent litigation venues, has adopted new Local Patent Rules aimed at streamlining cases with fixed and relatively short timelines, including a Markman hearing within nine months of the scheduling conference, which may make it an increasingly attractive venue for patent cases. The ongoing IPRs and the multiple parallel district court cases against different defendants concerning a family of patents related to stroller attachments indicate a significant industry impact within the juvenile product market.

Key Legal Developments and Outcome for Patent Infringement Litigation 1:24-cv-11582 (D. Mass.)

This patent infringement litigation, filed in the U.S. District Court for the District of Massachusetts under case number 1:24-cv-11582, involves U.S. Patent No. 11,505,231. The plaintiff is Baby Jogger, LLC, and the defendant is Monahan Products, LLC, doing business as UPPAbaby. The case is presided over by Judge Allison D. Burroughs.

Chronological Developments:

• 2024-06-18: Complaint Filed. Baby Jogger, LLC initiated the lawsuit against Monahan Products, LLC d/b/a UPPAbaby, alleging infringement of U.S. Patent No. 11,505,231. This was part of a broader enforcement effort by Baby Jogger, which also filed separate lawsuits against Evenflo Co. Inc. (1:24-cv-00723) and Baby Generation, Inc. d/b/a Mockingbird (1:24-cv-00725) in the District of Delaware on the same day, concerning similar stroller attachment patents.

• Initial Pleadings (Dates not precisely identified, but occurred before PTAB filings): Monahan Products, LLC d/b/a UPPAbaby filed its Answer and Counterclaims to Baby Jogger's First Amended Complaint. Subsequently, Baby Jogger filed its Answer to UPPAbaby's Counterclaims.

• 2025-02-14: UPPAbaby's Invalidity Contentions Served. UPPAbaby served its invalidity contentions in the Massachusetts district court case. [cite: 16 in prior thought]

• 2025-03-28: UPPAbaby's Opening Claim Construction Brief Filed. UPPAbaby submitted its initial brief for claim construction (Markman) to the court (ECF No. 58). [cite: 16 in prior thought]

• 2025-06-05: IPR2025-01095 Petition Filed. Baby Generation, Inc. d/b/a Mockingbird (one of the defendants in the parallel Delaware litigation) filed an inter partes review (IPR) petition, IPR2025-01095, against U.S. Patent No. 11,505,231 at the Patent Trial and Appeal Board (PTAB). This petition specifically refers to the ongoing Massachusetts litigation (1:24-cv-11582) and Baby Jogger's infringement contentions for the '231 patent within that case. The petition also highlights that the parties are challenging the patent's priority date, asserting that the '231 patent has only been in force since November 22, 2022, and is an indirect continuation of a CIP application.

• 2025-06-19: IPR2025-01106 Petition Filed. Monahan Products, LLC d/b/a UPPAbaby, along with Baby Generation, Inc. d/b/a Mockingbird, filed IPR2025-01106 against U.S. Patent No. 9,403,550. While this IPR is related to the overall disputes between the parties, it does not directly target U.S. Patent No. 11,505,231, which is the focus of this summary. [cite: 10 in prior thought]

• 2025-07-17: Markman Hearing Held. A Markman (claim construction) hearing took place in the Massachusetts district court case. A transcript of this hearing exists.

• Pre-Trial Motions (Status as of PTAB filings): Motions to stay the parallel Delaware cases (1:24-cv-00723 and 1:24-cv-00725) pending IPR outcomes were filed by Evenflo and Mockingbird, respectively, and Baby Jogger opposed Evenflo's motion to stay. As of late 2025, the Mockingbird litigation had a pending motion to dismiss, and the Evenflo case had not yet had a Rule 26 conference. There is no explicit mention of a motion to stay in the Massachusetts case (1:24-cv-11582) in the search results provided, but the PTAB documents suggest that the district court cases are proceeding in parallel.

Current Posture (as of May 19, 2026):

The Massachusetts case (1:24-cv-11582) is active, and it has proceeded to the Markman stage. Although a Markman hearing was held on July 17, 2025, the district court has not yet issued a claim construction ruling. No trial date or further case dates have been calendared.

Parallel PTAB IPR Proceedings and Their Effect:

Several IPRs have been filed by the defendants in Baby Jogger's related litigations, challenging patents including U.S. Patent No. 11,505,231.

• IPR2025-01095 specifically targets U.S. Patent No. 11,505,231. The PTAB proceedings related to this and other patents are addressing complex priority issues. The petitioners in the IPRs have challenged Baby Jogger's attempt to rely on an earlier priority date for the patents.
• The PTAB documents indicate that several IPRs related to the '231 and '729 Patents challenge the patent owner's (Baby Jogger's) reliance on a 2008 priority date, arguing that new subject matter introduced in 2016 should preclude it. These IPRs highlight potential inconsistencies in claim construction positions taken by UPPAbaby in district court versus those presented to the Board. [cite: 16 in prior thought]
• A key argument in the IPRs is that resolving the dispositive priority issue at the PTAB would be more efficient than having three defendants litigate a complex priority issue in three separate trials across two jurisdictions.
• As of late 2025, a final written decision in the IPRs was projected to occur before trial in the district court cases.
• The impact on the Massachusetts litigation is indirect, as the court is awaiting a claim construction ruling, and the PTAB's decisions on validity could significantly influence the district court's infringement analysis, potentially leading to a stay or affecting the case's trajectory. However, no explicit motion to stay the Massachusetts case pending IPR outcomes has been identified in the provided search results.

Baby Jogger, LLC, the plaintiff in Baby Jogger, LLC v. Monahan Products, LLC d/b/a UPPAbaby (1:24-cv-11582), is represented by attorneys from the firm Wolf Greenfield & Sacks, P.C..

Counsel of record for Baby Jogger, LLC includes:

• Jonathan B. Roses (Lead Counsel)
  • Firm: Wolf Greenfield & Sacks, P.C., Boston, MA
  • Experience: Jonathan B. Roses is a shareholder in Wolf Greenfield's Pharmaceutical Practice Group and manages large U.S. and international patent portfolios. He advises clients on IP strategy, including regulatory matters related to small molecule and biologic drugs and medical devices, and represents life sciences companies in contested matters such as post-grant and federal district court proceedings. He has experience in Hatch-Waxman patent litigation and has successfully represented clients in the Court of Appeals for the Federal Circuit and before the Patent Trial and Appeal Board (PTAB).

While other attorneys may be involved in the case as local counsel or support, Jonathan B. Roses is consistently identified in publicly available information related to Baby Jogger's patent enforcement efforts, including parallel PTAB proceedings and related district court cases. Other attorneys named Jonathan Rose or Sarah Chang were found in searches, but their experience did not align with patent litigation or the correct firm and court for this case, suggesting they are not counsel in this matter. Similarly, a search for Douglas R. Hatch found a firm specializing in intellectual property, but no direct connection to this case or Baby Jogger as a client. Kenneth J. King was found to have experience in complex litigation, including product liability, but his profile does not indicate patent litigation experience for Baby Jogger.

Monahan Products, LLC, doing business as UPPAbaby, the defendant in Baby Jogger, LLC v. Monahan Products, LLC d/b/a UPPAbaby (1:24-cv-11582), is represented by attorneys from Fish & Richardson P.C. and Lando & Anastasi LLP.

Counsel of record for UPPAbaby includes:

• Neil J. McNabnay (Lead Counsel)

  • Firm: Fish & Richardson P.C., Dallas, TX (Fish & Richardson has offices across the US and Europe, with a strong presence in patent litigation).
  • Experience: Mr. McNabnay's practice focuses on patent litigation across diverse industries, including software, hardware, transportation, and semiconductors. He has significant experience serving as defense counsel in large-scale patent litigation and has successfully obtained favorable settlements and jury verdicts for clients. Fish & Richardson is a prominent intellectual property law firm, highly recognized for its patent litigation, prosecution, and post-grant experience, handling a significant number of district court patent cases and PTAB proceedings.

• Michael F. Autuoro (Counsel)

  • Firm: Fish & Richardson P.C., New York, NY (managing principal of the New York office).
  • Experience: Mr. Autuoro is a trial lawyer with over fifteen years of experience in patent litigation and patent due diligence counseling. He has successfully briefed and argued Markman hearings and summary judgment motions. His background in systems engineering allows him to work on diverse subject matters, including medical device and enterprise software systems.

• Kevin M. Eckert (Counsel)

  • Firm: Lando & Anastasi LLP, Boston, MA.
  • Experience: Kevin M. Eckert is identified as counsel for UPPAbaby in related PTAB inter partes review (IPR) proceedings involving U.S. Patent No. 11,192,568, which is part of Baby Jogger's patent enforcement efforts against UPPAbaby and other defendants. This suggests his involvement in the broader patent dispute strategy.

It's worth noting that while other "Kenneth Rubenstein" attorneys appear in searches related to patent law, the specific Kenneth E. Rubenstein associated with patent litigation and the firm Fish & Richardson does not appear to be involved in this specific case, and other attorneys with similar names are not associated with patent litigation for UPPAbaby or the correct firms. The RPX Insight docket information generally requires a subscription for full counsel representation details. However, information from PTAB proceedings and general firm profiles strongly indicates the counsel listed above.