Patent 12239333

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 (1)

Asserters network →

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

  1. 2024-01-11 · reel 063380/0556 · Assignment

    QUICK, RICHARD; LUBOCK, PAUL; MERRITT, BENJAMIN EDWARD; THRESS, JOHN COLEMAN; TU, THOMAS M.INARI MEDICAL, INC.

    Correspondent: Matthew J. Van Eman · Knobbe, Martens, Olson & Bear

    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

  • Richard Quick (Inari Medical Inc)
  • Benjamin Edward Merritt (Inari Medical Inc)
  • John Coleman Thress (Inari Medical Inc)
  • Paul Lubock (Inari Medical Inc)
  • Thomas M. Tu (Inari Medical Inc)

All inventors appear to be associated with Inari Medical Inc. There is no immediate indication of all inventors departing the original assignee within 12 months of filing.

Original assignee

Inari Medical Inc is the original assignee. Inari Medical Inc is an operating company focused on developing products for the treatment of venous diseases, including pulmonary embolism and deep vein thrombosis. They ship products embodying the claims, such as the FlowTriever and ClotTriever systems, which align with the patent's description of devices for intravascular clot removal. The company is currently operating.

Assignment timeline

  • 2024-01-11 (executed) / recorded 2024-01-11 — Reel 063380/0556
    • Conveyance: Assignment
    • Assignor: QUICK, RICHARD; LUBOCK, PAUL; MERRITT, BENJAMIN EDWARD; THRESS, JOHN COLEMAN; TU, THOMAS M.
    • Assignee: Inari Medical, Inc.
    • Correspondent: Matthew J. Van Eman, Knobbe, Martens, Olson & Bear, LLP, 2040 Main Street, 14th Floor, Irvine, CA 92614.
    • Context: Internal reorg (assignment from inventors to company)

Timeline diagram

timeline
    title Ownership of US 12239333
    2023 : Filed by Inari Medical Inc
    2024 : Assigned from inventors to Inari Medical Inc
    2025 : Issued to Inari Medical Inc

NPE / troll-pattern signals

  1. Shell-entity transfer — not present. The sole assignment on record is from the individual inventors to Inari Medical Inc., which is an operating company.
  2. Known asserter in the chain — not present. Inari Medical Inc. is not identified as a known asserter.
  3. Repeat correspondent across the chain — unclear. Matthew J. Van Eman of Knobbe, Martens, Olson & Bear, LLP is listed as the correspondent for the inventor assignment. Without further assignment records or a broader database of correspondent activity, it's not possible to determine if this correspondent recurs across multiple chains indicative of an NPE pattern.
  4. Cascading transfers — not present. There is only one recorded assignment for this patent.
  5. Pre-litigation transfer — not present. The assignment from the inventors to Inari Medical Inc. occurred on January 11, 2024, and the patent was granted on March 4, 2025. While there is a PTAB case IPR2026-00215 filed (Pending) as of April 26, 2026, this is not an infringement suit, and the assignment date does not fall within 6 months before the PTAB filing.
  6. Bankruptcy fire-sale — not present. There is no indication of Inari Medical Inc. having filed for bankruptcy.
  7. Privateering — not present. There is no evidence of Inari Medical Inc. transferring the patent to an NPE to assert on their behalf.
  8. Defensive aggregator (anti-NPE) — not present. The patent is currently assigned to Inari Medical Inc., an operating company.

Verdict

Operating-company assertion The sole assignment on record is from the individual inventors to Inari Medical Inc. on 2024-01-11 (Reel 063380/0556), which is an operating company that manufactures and sells products embodying the claims. There are no other signals indicative of NPE activity.

USPTO Assignment Center search page for US12239333: https://assignmentcenter.uspto.gov/patent/index.html?query=[12239333](/patent/12239333)

Generated 5/28/2026, 12:46:37 PM