Patent 12221638

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. ? · recorded 2022-10-15 · Assignment of Assignors Interest

    BYUN, Minsoo, CHO, Jeong Soo, KIM, JI-SUN, KIM, Kyuwan, NAM, KI SEOK, PARK, Kibum, PARK, SOON JAE, SONG, Hyung Nam, YUN, SANG HOONALTEOGEN INC.

    internal reorg

  2. ? · recorded 2024-09-04 · Corrective Assignment

    BYUN, Minsoo, CHO, Jeong Soo, KIM, JI-SUN, KIM, Kyuwan, NAM, KI SEOK, PARK, Kibum, PARK, SOON JAE, SONG, Hyung Nam, YUN, SANG HOONALTEOGEN INC.

    correction

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

  • Soon Jae Park (Alteogen Inc.)
  • Kyuwan KIM (Alteogen Inc.)
  • Sang Hoon YUN (Alteogen Inc.)
  • Jeong Soo CHO (Alteogen Inc.)
  • Kibum PARK (Alteogen Inc.)
  • Minsoo Byun (Alteogen Inc.)
  • Hyung-Nam Song (Alteogen Inc.)
  • Ji-Sun KIM (Alteogen Inc.)
  • Ki Seok NAM (Alteogen Inc.)

All inventors appear to have been employed by Alteogen Inc. at the time of filing, as indicated by the application being filed by Alteogen Inc. and subsequent assignments of interest from the inventors to Alteogen Inc. There are no unusual patterns suggesting inventor departures or a portfolio fire-sale.

Original assignee

The original assignee on the issued patent is Alteogen Inc..
Alteogen Inc. is a South Korea-based biotechnology company founded in 2008, focused on the research, development, and commercialization of novel biologics, including biobetters and biosimilars, utilizing proprietary platform technologies such as NexP™ Fusion Technology, NexMab™ ADC Technology, and Hybrozyme™ Technology.
Yes, Alteogen Inc. ships products embodying the claims, specifically a recombinant human hyaluronidase (Hybrozyme™ / Tergase®).
Alteogen Inc. is currently operating and active, with a market capitalization of $13 billion as of May 2026.

Assignment timeline

The detailed assignment records including reel/frame and correspondent information from the USPTO Assignment Center were not provided in the prompt and could not be accessed. However, Google Patents legal events indicate the following reassignment events to the original assignee:

  • NOT PROVIDED (executed) / recorded 2022-10-15 — Reel NOT PROVIDED/NOT PROVIDED
    • Conveyance: Assignment of Assignors Interest
    • Assignor: BYUN, Minsoo, CHO, Jeong Soo, KIM, JI-SUN, KIM, Kyuwan, NAM, KI SEOK, PARK, Kibum, PARK, SOON JAE, SONG, Hyung Nam, YUN, SANG HOON (inventors)
    • Assignee: ALTEOGEN INC.
    • Correspondent: NOT PROVIDED
    • Context: Internal assignment from inventors to the original assignee.
  • NOT PROVIDED (executed) / recorded 2024-09-04 — Reel NOT PROVIDED/NOT PROVIDED
    • Conveyance: Corrective Assignment
    • Assignor: BYUN, Minsoo, CHO, Jeong Soo, KIM, JI-SUN, KIM, Kyuwan, NAM, KI SEOK, PARK, Kibum, PARK, SOON JAE, SONG, Hyung-Nam, YUN, SANG HOON (inventors)
    • Assignee: ALTEOGEN INC.
    • Correspondent: NOT PROVIDED
    • Context: Corrective assignment of inventors' interest to the original assignee.

Timeline diagram

timeline
    title Ownership of US 12221638
    2021 : Application filed by Alteogen Inc
    2022 : Inventors assign to Alteogen
    2024 : Corrective assignment to Alteogen
    2025 : Patent granted

NPE / troll-pattern signals

  1. Shell-entity transfer — not present. The assignments are from the inventors to Alteogen Inc., which is an operating company producing and commercializing biopharmaceutical products.
  2. Known asserter in the chain — not present. Alteogen Inc. is not identified as a known NPE.
  3. Repeat correspondent across the chain — unclear. Correspondent information (name, firm, address) for the recorded assignments was not provided in the available data.
  4. Cascading transfers — not present. There are only two assignments recorded, both involving the inventors and the original assignee, Alteogen Inc., and separated by nearly two years. These are not transfers through chained LLCs.
  5. Pre-litigation transfer — not present. There is no indication of litigation for this patent in the provided information, and the assignments are internal from inventors to the company.
  6. Bankruptcy fire-sale — not present. Alteogen Inc. is an active, operating company.
  7. Privateering — not present. There is no evidence of Alteogen Inc. transferring the patent to an NPE for assertion on its behalf.
  8. Defensive aggregator (anti-NPE) — not present. The patent is currently assigned to Alteogen Inc., an operating company.

Verdict

Insufficient data.
While Alteogen Inc. appears to be an operating company, the absence of detailed assignment records including reel/frame numbers and correspondent information prevents a full and confident assessment of NPE patterns, particularly those relying on correspondent identities. The only recorded events are initial and corrective assignments from the inventors to the original assignee.

Verification on USPTO Patent Assignment Search

Generated 5/27/2026, 6:47:04 PM