Patent 10578818

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. 2018-10-10 · reel 046897/0050 · ASSIGNMENT OF ASSIGNORS INTEREST

    CHEN, YU; SHIU, HSUAN-CHEN; YEH, CHE-SHOUPRIME WORLD INTERNATIONAL HOLDINGS LTD.

    Correspondent: BAEK, SEONG WON

    acquisition

  2. 2024-11-14 · recorded 2024-11-20 · reel 061001/0572 · ASSIGNMENT OF ASSIGNORS INTEREST

    PRIME WORLD INTERNATIONAL HOLDINGS LTD.APPLIED OPTOELECTRONICS, INC.

    Correspondent: BAUM, MARC S

    acquisition

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

  • Yu Chen
  • Hsuan-Chen Shiu
  • Che-Shou Yeh

No information is available regarding their employer at the time of filing or any unusual departure patterns.

Original assignee

The original assignee on the issued patent was Prime World International Holdings Ltd. There is no readily available public information detailing whether Prime World International Holdings Ltd shipped a product embodying the claims or their primary line of business. Their current status (operating, acquired, dissolved, in bankruptcy) is not determinable from the provided information.

Assignment timeline

  • 2018-10-10 (executed) / recorded 2018-10-10 — Reel 046897/0050

    • Conveyance: ASSIGNMENT OF ASSIGNORS INTEREST
    • Assignor: CHEN, YU; SHIU, HSUAN-CHEN; YEH, CHE-SHOU
    • Assignee: PRIME WORLD INTERNATIONAL HOLDINGS LTD.
    • Correspondent: BAEK, SEONG WON; SUITE 168, 1400 E TOUHY AVE, DES PLAINES, IL 60018
    • Context: Original assignment from inventors to the initial assignee.

  • 2024-11-14 (executed) / recorded 2024-11-20 — Reel 061001/0572

    • Conveyance: ASSIGNMENT OF ASSIGNORS INTEREST
    • Assignor: PRIME WORLD INTERNATIONAL HOLDINGS LTD.
    • Assignee: APPLIED OPTOELECTRONICS, INC.
    • Correspondent: BAUM, MARC S; APPLIED OPTOELECTRONICS, INC., 13115 JESSICA DRIVE, SUGAR LAND, TX 77478
    • Context: Transfer of patent ownership from the original assignee to the current assignee, Applied Optoelectronics, Inc.

Timeline diagram

timeline
    title Ownership of US 10578818
    2018 : Filed by Prime World International Holdings Ltd
         : Assigned from inventors to Prime World
    2020 : Issued
    2024 : Assigned to Applied Optoelectronics Inc

NPE / troll-pattern signals

  1. Shell-entity transfer — unclear. Prime World International Holdings Ltd's primary business and product shipments are not determinable from the provided information. The transfer to Applied Optoelectronics, Inc. (an operating company) does not, by itself, indicate a shell-entity transfer.

  2. Known asserter in the chain — not present. Neither Prime World International Holdings Ltd nor Applied Optoelectronics Inc. are on the provided lists of known NPEs. However, Applied Optoelectronics, Inc. is a publicly traded company that manufactures and sells optical transceivers, fiber-optic components, and HFC networking products.

  3. Repeat correspondent across the chain — not present. The correspondent for the first assignment (Baek, Seong Won) is different from the correspondent for the second assignment (Baum, Marc S.). No recurrence of either correspondent is observed in this chain.

  4. Cascading transfers — not present. There are only two assignments recorded, spaced more than six years apart, which does not constitute cascading transfers.

  5. Pre-litigation transfer — unclear. While there is litigation associated with this patent (PTAB case IPR2026-00094 and US cases 5:24-cv-08165 and 3:24-cv-08165 in the California Northern District Court), the dates of the assignments (2018 and 2024) are not within six months of the reported litigation filings (2024 and 2026).

  6. Bankruptcy fire-sale — not present. There is no information to suggest that either assignor in the chain underwent bankruptcy proceedings.

  7. Privateering — not present. There is no evidence from the provided information suggesting that Prime World International Holdings Ltd transferred the patent to an NPE to assert on its behalf, nor are there SEC filings or other reports indicating such an arrangement. Applied Optoelectronics, Inc. is an operating company.

  8. Defensive aggregator (anti-NPE) — not present. The chain terminates with Applied Optoelectronics, Inc., which is an operating company, not a defensive aggregator.

Verdict

Operating-company assertion
The patent was initially assigned from the inventors to Prime World International Holdings Ltd. and subsequently transferred to Applied Optoelectronics, Inc., a known operating company that manufactures and sells optical transceivers. There are no strong signals of NPE activity, such as shell-entity transfers, known asserters in the chain, cascading transfers, or privateering.

USPTO Assignment Center Search for US10578818

Generated 5/26/2026, 6:48:10 AM