Patent 8271315

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. 2012-06-13 · recorded 2012-08-10 · reel 028769/0019 · Assignment

    KAGIWADA, YOSHIMITSUKEYSOFT, INC.

    Transfer from inventor 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.

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Inventors

  • Yoshimitsu Kagiwada (Keysoft Inc.)

Original assignee

The original assignee is Keysoft Inc. It is unclear from the patent text or general web search whether Keysoft Inc. shipped a product embodying the claims. Their primary line of business, as inferred from the patent, appears to be software development related to personal information utilization systems. Keysoft Inc. is currently an operating company and the plaintiff in ongoing litigation related to this patent.

Assignment timeline

  • 2012-06-13 (executed) / recorded 2012-08-10 — Reel 028769/0019
    • Conveyance: Assignment
    • Assignor: KAGIWADA, YOSHIMITSU
    • Assignee: KEYSOFT, INC.
    • Correspondent: NOT RECORDED.
    • Context: Transfer from inventor to original assignee.

Timeline diagram

timeline
    title Ownership of US 8271315
    2002 : Filed by Keysoft Inc
    2012 : Issued to Keysoft Inc
         : Inventor assigned to Keysoft Inc
    2024 : First infringement suit filed

NPE / troll-pattern signals

  1. Shell-entity transfer — not present. The patent was assigned from the inventor to Keysoft Inc., the original assignee named on the patent. There is no evidence of a subsequent transfer to a shell entity.
  2. Known asserter in the chain — not present. Keysoft Inc. is the current assignee and there is no record of the patent being assigned to a known NPE from public lists.
  3. Repeat correspondent across the chain — not present. The initial assignment from the inventor to Keysoft Inc. does not have a recorded correspondent. There are no subsequent assignments to check for recurring correspondents.
  4. Cascading transfers — not present. Only one assignment from the inventor to the original assignee is recorded.
  5. Pre-litigation transfer — not present. The assignment from the inventor to Keysoft Inc. occurred in 2012, long before the first litigation filing in 2024. There are no recorded transfers immediately preceding the litigation.
  6. Bankruptcy fire-sale — not present. There is no indication that Keysoft Inc. has filed for bankruptcy, and the assignment on record is from the inventor to the company, not as part of bankruptcy proceedings.
  7. Privateering — unclear. While Keysoft Inc. is asserting the patent, it is not clear whether this is on behalf of another operating company or in its own capacity as a direct competitor.
  8. Defensive aggregator (anti-NPE) — not present. The patent is currently owned and being asserted by Keysoft Inc., not a defensive aggregator.

Verdict

Operating-company assertion

The recorded assignment history only shows the transfer from the individual inventor to Keysoft Inc., the original assignee. Keysoft Inc. is currently asserting the patent in litigation, indicating active enforcement by the original patent owner. [cite: https://patents.google.com/patent/[US8271315](/patent/US8271315)/en]

Generated 5/19/2026, 12:01:34 PM