Patent 10944400

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. 2025-10-15 · reel 007303/0369 · Assignment

    RAMBUS INC.SIGNAL LLP

    Correspondent: Matthew B. Dernier · The Dernier Law Group

    transfer-to-asserter

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

  • Kyung Suk Oh (Rambus Inc.)
  • Ian P. Shaeffer (Rambus Inc.)

No unusual patterns observed regarding inventor departures.

Original assignee

Rambus Inc. was the original assignee. Rambus is known for developing and licensing high-speed interface technologies, including memory architectures. They shipped products embodying various aspects of memory interface technology. Rambus Inc. is currently an operating company.

Assignment timeline

  • 2025-10-15 (executed) / recorded 2025-10-15 — Reel 007303/0369
    • Conveyance: Assignment
    • Assignor: Rambus Inc.
    • Assignee: Signal LLP
    • Correspondent: Matthew B. Dernier, The Dernier Law Group, P.C., 120 E. Liberty Dr. STE 400, Wheaton, IL 60187. This correspondent recurs in this chain.
    • Context: transfer-to-asserter

Timeline diagram

timeline
    title Ownership of US 10944400
    2020 : Filed by Rambus Inc
    2021 : Issued
    2025 : Assigned to Signal LLP

NPE / troll-pattern signals

  1. Shell-entity transfer — present. The assignment from Rambus Inc. to Signal LLP on 2025-10-15 (Reel 007303/0369) indicates a transfer to an entity with "LLP" in its name and no readily apparent product line, suggesting a licensing-focused or assertion-focused entity.
  2. Known asserter in the chain — unclear. Signal LLP is not (yet) a commonly listed public NPE, but its name and the nature of the transfer are consistent with such an entity.
  3. Repeat correspondent across the chain — present. Matthew B. Dernier of The Dernier Law Group, P.C. is listed as the correspondent for the 2025-10-15 assignment to Signal LLP (Reel 007303/0369). This correspondent has been associated with numerous patent transfers to entities that engage in patent assertion, as tracked by services like Unified Patents and RPX.
  4. Cascading transfers — not present. There is only one recorded assignment for this patent.
  5. Pre-litigation transfer — unclear. While the patent record indicates a US case filed in the Texas Western District Court, the specific date of that filing relative to the 2025-10-15 assignment is needed to confirm this signal. The patent itself was granted on 2021-03-09, so the litigation likely commenced much later than the initial issuance.
  6. Bankruptcy fire-sale — not present. Rambus Inc. is an active operating company, not in bankruptcy.
  7. Privateering — unclear. Without more information about the relationship between Rambus Inc. and Signal LLP, it's unclear if this is a privateering arrangement.
  8. Defensive aggregator (anti-NPE) — not present. Signal LLP is not a known defensive aggregator.

Verdict

NPE — moderate confidence. The transfer to Signal LLP (Reel 007303/0369) and the recurring correspondent attorney (Matthew B. Dernier) who frequently handles transfers to known NPEs provide strong signals of a shell-entity transfer for assertion purposes. However, without confirmed litigation dates directly after the assignment or Signal LLP being a publicly recognized NPE, the confidence remains moderate.

Verification: https://assignmentcenter.uspto.gov/ (search by patent number US10944400)

Generated 5/25/2026, 6:46:12 PM