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.

Assignment history

Inventors

Diane D. Harrison
Elizabeth C. Hsia
Lee-Lian Kim
Kim Hung Lo

The patent document does not specify the employers of the inventors at the time of filing.

Original assignee

The original assignee named on the issued patent is Janssen Biotech Inc.. Janssen Biotech Inc. is a pharmaceutical company focused on developing and commercializing biopharmaceutical products. They are part of the Janssen Pharmaceutical Companies of Johnson & Johnson and ship products embodying biological claims. Janssen Biotech Inc. is currently operating.

Assignment timeline

No assignments are recorded for US patent 12291566 in the USPTO Assignment Center as of 2026-05-29.

Timeline diagram

timeline
    title Ownership of US 12291566
    2021 : Application filed by Janssen Biotech Inc
    2025 : Application granted, issued to Janssen Biotech Inc

NPE / troll-pattern signals

Shell-entity transfer — not present
Known asserter in the chain — not present
Repeat correspondent across the chain — not present
Cascading transfers — not present
Pre-litigation transfer — not present
Bankruptcy fire-sale — not present
Privateering — not present
Defensive aggregator (anti-NPE) — not present

Verdict

Insufficient data. As of 2026-05-29, there are no assignment records for US12291566 on the USPTO Assignment Center. The patent was granted to the original assignee, Janssen Biotech Inc., and no subsequent transfers have been recorded.

https://patents.google.com/patent/US12291566/en
https://assignmentcenter.uspto.gov/patents/12291566