Patent 11878729

Assignment history

Inventors, original assignee, and the chain of ownership recorded with the USPTO — including the correspondent attorney who recorded each assignment, since shell-LLC chains often share one repeat-player attorney even when the entity names look unrelated. Surfaces NPE / patent-troll patterns: shell-entity transfers, known asserters in the chain, repeat correspondent fingerprints, pre-litigation assignments, and bankruptcy fire-sales.

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Ownership chain (2)

Asserters network →

Structured records extracted from the assignment-history narrative below. Each entity links to its full ownership-network profile.

  1. 2022-10-31 · Assignment

    Mark ZehfussBABY JOGGER, LLC

    acquisition

  2. 2026-01-23 · Assignment

    BABY JOGGER, LLCBABY JOGGER II, LLC

    internal reorg

Assignment history

Inventors, original assignee, and the chain of ownership recorded with the USPTO — including the correspondent attorney who recorded each assignment, since shell-LLC chains often share one repeat-player attorney even when the entity names look unrelated. Surfaces NPE / patent-troll patterns: shell-entity transfers, known asserters in the chain, repeat correspondent fingerprints, pre-litigation assignments, and bankruptcy fire-sales.

✓ Generated

Inventors

The sole named inventor is Mark Zehfuss. The patent document does not explicitly state his employer at the time of filing. However, the first assignment of the patent application was from Mark Zehfuss to Baby Jogger, LLC on October 31, 2022, suggesting he was either employed by Baby Jogger, LLC or had an obligation to assign the invention to them around the filing date.

Original Assignee

The original assignee named on the issued patent is Baby Jogger LLC. Baby Jogger is a well-known brand that manufactures and sells children's strollers and related mobility products. Based on general knowledge of the brand, they ship products embodying claims such as those related to stroller seats and attachments. As of the latest assignment recorded on Google Patents, the patent is assigned to Baby Jogger II LLC, indicating a potential corporate restructuring or acquisition affecting the original entity.

Assignment timeline

The following assignment records are based on information aggregated by Google Patents. Full USPTO Assignment Center details, including reel/frame numbers and correspondent information, are not available from the provided source.

  • 2022-10-31 (assigned) — Date not recorded

    • Conveyance: Assignment (from inventor)
    • Assignor: Mark Zehfuss
    • Assignee: Baby Jogger, LLC
    • Correspondent: Not available in source.
    • Context: Inventor assigned rights to the original operating company.

  • 2026-01-23 (assigned) — Date not recorded

    • Conveyance: Assignment
    • Assignor: Baby Jogger, LLC
    • Assignee: BABY JOGGER II, LLC
    • Correspondent: Not available in source.
    • Context: Transfer between related corporate entities, likely an internal reorganization or name change.

Timeline diagram

timeline
    title Ownership of US 11878729
    2008 : Priority date
    2022 : Inventor assigned to Baby Jogger LLC
    2024 : Patent issued; Litigation initiated
    2026 : Assigned to Baby Jogger II LLC

NPE / troll-pattern signals

  1. Shell-entity transfer — Not present. The names "Baby Jogger, LLC" and "BABY JOGGER II, LLC" do not carry the typical suffixes (e.g., "IP," "Patents," "Holdings") associated with shell entities. These appear to be operating company names or directly related corporate entities.
  2. Known asserter in the chain — Not present. Neither Baby Jogger, LLC nor BABY JOGGER II, LLC appears on public NPE lists such as those maintained by RPX Insurance or Unified Patents.
  3. Repeat correspondent across the chain — Unclear. The correspondent information (attorney name, firm, address) for the recorded assignments is not available in the provided source, preventing evaluation of this signal.
  4. Cascading transfers — Not present. Only two assignments are noted (excluding the initial inventor assignment) in the chain, which does not constitute "multiple consecutive assignments through chained LLCs in <24 months."
  5. Pre-litigation transfer — Not present. The assignment to BABY JOGGER II, LLC was recorded on January 23, 2026. However, several US district court cases involving this patent were filed starting in June 2024 (e.g., 1:24-cv-00725 filed June 21, 2024; 1:24-cv-00723 filed June 21, 2024; 1:24-cv-11582 filed June 25, 2024). The initial litigation therefore predates the transfer to BABY JOGGER II, LLC, indicating this transfer was not a pre-litigation maneuver.
  6. Bankruptcy fire-sale — Not present. There is no indication in the provided patent information that Baby Jogger, LLC or any prior assignee filed for bankruptcy and sold patents in the proceedings.
  7. Privateering — Unclear. No information is available from the provided source to determine if this patent was transferred to an NPE to assert on an operating company's behalf.
  8. Defensive aggregator (anti-NPE) — Not present. The current assignee, BABY JOGGER II, LLC, is not a known defensive aggregator like RPX, Allied Security Trust (AST), LOT Network, Unified Patents, or Open Invention Network.

Verdict

Operating-company assertion. The chain shows the patent moving from the inventor to Baby Jogger, LLC, and subsequently to BABY JOGGER II, LLC. Both entities appear to be directly associated with the operating company that develops and sells strollers. The litigation associated with the patent also commenced prior to the most recent inter-company transfer, further indicating active assertion by a commercial entity rather than a shell company created for litigation.
You can verify the assignment records through the USPTO Assignment Center by searching for patent number 11878729: https://assignmentcenter.uspto.gov/

Generated 5/17/2026, 12:48:41 PM