Patent 12031894

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. 2023-11-30 · reel 059952/0130 · Assignment of Assignors Interest

    O'RIORDAN, CATHERINE; BURNHAM, BRENDAGENZYME CORPORATION

    Correspondent: Bjoern Staschen · Sanofi

    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

  • Catherine R. O'Riordan (Genzyme Corp)
  • Brenda BURNHAM (Genzyme Corp)

No unusual patterns detected based on the provided information.

Original assignee

Genzyme Corp. is the original assignee. Genzyme Corp. is a biotechnology company that develops and manufactures products for rare diseases. While the patent describes methods for characterizing recombinant viral particles, it is unclear from the patent text alone whether Genzyme Corp. directly shipped a product embodying the claims (i.e., a commercial product for performing analytical ultracentrifugation for viral particle characterization). Their primary line of business is biotechnology, focusing on therapeutics for rare diseases. Genzyme Corp. was acquired by Sanofi in 2011 and operates as a subsidiary.

Assignment timeline

  • 2023-11-30 (executed) / recorded 2023-11-30 — Reel 059952/0130
    • Conveyance: Assignment of Assignors Interest
    • Assignor: O'RIORDAN, CATHERINE; BURNHAM, BRENDA
    • Assignee: GENZYME CORPORATION
    • Correspondent: Bjoern Staschen, Sanofi, 50 Binney Street, Cambridge, MA 02142
    • Context: Internal transfer from inventors to corporate assignee

Timeline diagram

timeline
    title Ownership of US 12031894
    2015 : Priority date
    2023 : Application filed
    2023 : Inventors assign to Genzyme Corp
    2024 : Granted

NPE / troll-pattern signals

  1. Shell-entity transfer — not present. The transfer is from individual inventors to Genzyme Corporation, a known operating company.
  2. Known asserter in the chain — not present. Genzyme Corporation is not a known NPE.
  3. Repeat correspondent across the chain — not present. Only one assignment is recorded, so no recurrence can be observed. The correspondent, Bjoern Staschen from Sanofi, is associated with the operating company Genzyme Corp.
  4. Cascading transfers — not present. Only one assignment is recorded.
  5. Pre-litigation transfer — unclear. While there is litigation mentioned in Google Patents ("Family has litigation," "PTAB case IPR2026-00150 filed (Pending)"), the specific filing date for the first infringement suit is not provided in the patent text or immediate search results. The only assignment record (2023-11-30) precedes the patent grant (2024-07-09).
  6. Bankruptcy fire-sale — not present. Genzyme Corp. was acquired by Sanofi, not dissolved or in bankruptcy.
  7. Privateering — not present. No evidence of an operating company transferring to an NPE for assertion.
  8. Defensive aggregator (anti-NPE) — not present. The current assignee is Genzyme Corp., an operating company.

Verdict

Insufficient data. Only one assignment from the inventors to the original assignee (Genzyme Corporation) is recorded at the USPTO Assignment Center. This is a standard initial assignment and does not provide enough information to identify NPE or patent-troll patterns.

Verification: https://assignmentcenter.uspto.gov/ (Search for patent number 12031894).

Generated 5/27/2026, 6:45:32 AM