Patent 11575148

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. 2022-12-29 · reel 059914/0833 · Assignment of Assignors Interest

    TAO, XINGHUA; WEI, ZENGBIN; YI, JIANJIAN; ZHANG, XINZHININGDE AMPEREX TECHNOLOGY LIMITED

    Correspondent: LIU, XIAOBING · FUJIAN KAIYUN INTELLECTUAL PROPERTY AGENCY CO.

    Transfer from inventors to original assignee

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

  • Jianjian Yi (Ningde Amperex Technology Ltd)
  • Xinzhi Zhang (Ningde Amperex Technology Ltd)
  • Zengbin Wei (Ningde Amperex Technology Ltd)
  • Xinghua Tao (Ningde Amperex Technology Ltd)

No unusual patterns observed, as all inventors appear to be associated with the original assignee at the time of filing.

Original assignee

Ningde Amperex Technology Ltd. is the entity named on the issued patent. Ningde Amperex Technology Ltd. (CATL) is a major Chinese battery manufacturer, and they ship products embodying the claims, specifically lithium-ion batteries. Their primary line of business is the research, development, manufacturing, and sales of battery systems for new energy vehicles and energy storage systems. Ningde Amperex Technology Ltd. is currently operating.

Assignment timeline

  • 2022-12-29 (executed) / recorded 2022-12-29 — Reel 059914/0833
    • Conveyance: Assignment of Assignors Interest
    • Assignor: TAO, XINGHUA; WEI, ZENGBIN; YI, JIANJIAN; ZHANG, XINZHI
    • Assignee: NINGDE AMPEREX TECHNOLOGY LIMITED
    • Correspondent: LIU, XIAOBING, FUJIAN KAIYUN INTELLECTUAL PROPERTY AGENCY CO., LTD., NO. 136, HONGJI ROAD, JIAOCHENG DISTRICT, NINGDE CITY, FUJIAN PROVINCE, CHINA
    • Context: Transfer from inventors to original assignee

Timeline diagram

timeline
    title Ownership of US 11575148
    2018 : Priority date
    2020 : Application filed
    2022 : Assigned to Ningde Amperex Technology
    2023 : Issued

NPE / troll-pattern signals

  1. Shell-entity transfer — not present. The initial assignment is from the inventors to Ningde Amperex Technology Limited, which is an operating company.
  2. Known asserter in the chain — not present. Ningde Amperex Technology Limited is not identified as a known asserter on public NPE lists.
  3. Repeat correspondent across the chain — unclear. Only one assignment is recorded, so there's no recurrence to observe. The correspondent is LIU, XIAOBING, FUJIAN KAIYUN INTELLECTUAL PROPERTY AGENCY CO., LTD..
  4. Cascading transfers — not present. Only one assignment is recorded.
  5. Pre-litigation transfer — unclear. There's a litigation filed in Texas Eastern District Court (case 2:24-cv-00728) in 2024, but the recorded assignment is from 2022, predating the litigation by more than six months.
  6. Bankruptcy fire-sale — not present. There is no indication that Ningde Amperex Technology Limited has filed for bankruptcy.
  7. Privateering — unclear. No SEC filings or other public reports indicate a privateering arrangement.
  8. Defensive aggregator (anti-NPE) — not present. The patent is currently assigned to an operating company, not a defensive aggregator.

Verdict

Operating-company assertion
The patent is currently assigned to Ningde Amperex Technology Limited, a known operating company that manufactures lithium-ion batteries. The recorded assignment is from the inventors to this operating company. While there is ongoing litigation related to this patent, the current owner is a product-shipping entity, suggesting an assertion by an operating company against competitors.

USPTO Assignment Center search page: https://assignmentcenter.uspto.gov/

Generated 6/27/2026, 12:46:17 AM