Patent 5803215

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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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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Inventors

  • Christopher P. Henze: Schott Power Systems Inc.
  • Kenneth E. Nicholls: Schott Power Systems Inc.

Original assignee

The original assignee on the issued patent is Schott Power Systems Inc. Schott Power Systems Inc. was a company involved in power conversion and related technologies. Based on publicly available information, it appears that Schott Power Systems Inc. was acquired by Alpha Technologies in 2000, which later became part of EnerSys. Therefore, Schott Power Systems Inc. is no longer an independent operating entity.

Assignment timeline

No assignments for US Patent 5803215 were found on the USPTO Assignment Center.

Timeline diagram

timeline
    title Ownership of US 5803215
    1997 : Filed by Schott Power Systems Inc
    1998 : Issued to Schott Power Systems Inc
    2000 : Acquired by Alpha Technologies (not a patent assignment)
    2017 : Patent expired

NPE / troll-pattern signals

  1. Shell-entity transfer — not present. No assignment records indicate a transfer to a shell entity.
  2. Known asserter in the chain — not present. No assignment records indicate ownership by a known asserter.
  3. Repeat correspondent across the chain — not present. No assignment records are available to assess this.
  4. Cascading transfers — not present. No assignment records are available to assess this.
  5. Pre-litigation transfer — not present. No assignment records are available to assess this.
  6. Bankruptcy fire-sale — not present. No assignment records indicate a transfer due to bankruptcy.
  7. Privateering — not present. No assignment records or other information suggest privateering.
  8. Defensive aggregator (anti-NPE) — not present. No assignment records indicate transfer to a defensive aggregator.

Verdict

Insufficient data. There are no recorded assignments for US Patent 5803215 in the USPTO Assignment Center. Therefore, there is insufficient data to determine if this patent has been involved in any NPE or patent-troll patterns. The current legal status is "Expired - Fee Related," indicating the patent is no longer in force.

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

Generated 6/9/2026, 12:45:32 AM