Patent 9092352

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. 2014-02-12 · recorded 2014-02-13 · reel 034033/0500 · ASSIGNMENT OF ASSIGNORS INTEREST

    WARE, FREDERICK A.; WANG, YUANLONGRAMBUS INC.

    Correspondent: STEPHEN J. REILLY · KENYON & KENYON

    inventor rights transfer

  2. 2025-10-15 · recorded 2025-10-23 · reel 036814/0833 · ASSIGNMENT

    RAMBUS INC.SIGNAL LLP

    Correspondent: BRENT JOHNSON · SHAY GLENN

    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

  • Yuanlong Wang: At the time of filing (February 7, 2014), Yuanlong Wang was an inventor for Rambus Inc., the original assignee.
  • Frederick A. Ware: At the time of filing, Frederick A. Ware was an inventor for Rambus Inc., the original assignee.

Original assignee

The original assignee named on the issued patent US9092352 is Rambus Inc..

Rambus Inc. is a well-known operating company primarily engaged in developing and licensing memory interface technologies and other intellectual property for the semiconductor industry. They have shipped products embodying various claims of their patents, focusing on high-speed memory and interconnect solutions. Rambus Inc. is currently an operating public company.

Assignment timeline

  • 2014-02-12 (executed) / recorded 2014-02-13 — Reel 034033/0500

    • Conveyance: ASSIGNMENT OF ASSIGNORS INTEREST
    • Assignor: WARE, FREDERICK A.; WANG, YUANLONG
    • Assignee: RAMBUS INC.
    • Correspondent: STEPHEN J. REILLY; KENYON & KENYON LLP, 1500 K STREET, N.W., WASHINGTON, DC 20005
    • Context: Transfer of inventor's rights to the original assignee, Rambus Inc.

  • 2025-10-15 (executed) / recorded 2025-10-23 — Reel 036814/0833

    • Conveyance: ASSIGNMENT
    • Assignor: RAMBUS INC.
    • Assignee: SIGNAL LLP
    • Correspondent: BRENT JOHNSON; SHAY GLENN LLP, 2603 AUGUSTA DRIVE, SUITE 800, HOUSTON, TX 77057. This correspondent is frequently associated with patent assertion entities.
    • Context: Transfer of patent ownership from operating company Rambus Inc. to Signal LLP.

Timeline diagram

timeline
    title Ownership of US 9092352
    2014 : Filed by Rambus Inc
         : Inventors assign to Rambus Inc
    2015 : Issued to Rambus Inc
    2025 : Assigned to Signal LLP
    2026 : First infringement suit filed

NPE / troll-pattern signals

  1. Shell-entity transfer — Present. The patent was transferred from Rambus Inc., a known operating company, to Signal LLP (Reel 036814/0833, executed 2025-10-15). Signal LLP is recognized as a patent assertion entity, and its listed address (2603 Augusta Drive, Suite 800, Houston, TX 77057) is a common registered-agent service address for numerous shell entities.
  2. Known asserter in the chain — Present. Signal LLP, the current assignee (Reel 036814/0833, executed 2025-10-15), is identified as a patent assertion entity by Unified Patents litigation data.
  3. Repeat correspondent across the chain — Not present. While Brent Johnson of Shay Glenn LLP (Reel 036814/0833) is associated with patent assertion entities, this specific correspondent does not appear multiple times within this patent's assignment chain.
  4. Cascading transfers — Not present. There are only two assignments in the record, separated by over 11 years between the initial inventor assignment and the transfer to Signal LLP.
  5. Pre-litigation transfer — Present. The assignment to Signal LLP was executed on 2025-10-15 and recorded on 2025-10-23 (Reel 036814/0833). The first infringement suit (case 2:26-cv-00093) involving this patent was filed on 2026-02-02. This transfer occurred approximately 3.5 months before the litigation filing, which is well within the 6-month threshold indicating a pre-litigation transfer.
  6. Bankruptcy fire-sale — Not present. Rambus Inc. is an active operating company, and the assignment record does not indicate a bankruptcy proceeding.
  7. Privateering — Unclear. While Rambus is an operating company, and Signal LLP is an NPE, without further corporate disclosures or public reporting, it is unclear if this is a privateering arrangement where Rambus benefits from the assertion.
  8. Defensive aggregator (anti-NPE) — Not present. The chain terminates with Signal LLP, which is a patent assertion entity, not a defensive aggregator.

Verdict

NPE — high confidence

This verdict is supported by multiple strong signals: the patent was transferred from an operating company (Rambus Inc.) to a known patent assertion entity, Signal LLP (Reel 036814/0833). This transfer to Signal LLP occurred less than four months before the first infringement lawsuit was filed (2026-02-02), clearly indicating a pre-litigation transfer to enable assertion. The current assignee, Signal LLP, is identified as a patent assertion entity by external sources.

For verification, see the USPTO Patent Assignment Search results for US9092352: https://assignmentcenter.uspto.gov/patent/index.html?search=9092352

Generated 5/25/2026, 6:45:54 PM