Patent RE50399

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. 2010-05-20 · recorded 2010-05-27 · reel 024450/0148 · Assignment

    CLARK, ANDREW C. and TOPHAM, DAVID W.SENSORTECH CORPORATION

    Correspondent: · BALLARD SPAHR

    acquisition

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

A direct fetch of the patent RE50399 claims and specification failed. However, a USPTO assignment record for US patent RE50399 (associated with application number 61321734) lists the following assignors for an assignment to SENSORTECH CORPORATION:

  • CLARK, ANDREW C.
  • TOPHAM, DAVID W.

The employer of the inventors at the time of filing is not determinable from the provided assignment record.

Original assignee

Based on the USPTO assignment record, the original assignee appears to be SENSORTECH CORPORATION.

Information regarding whether SENSORTECH CORPORATION shipped a product embodying the claims, their primary line of business, or their current status (operating, acquired, dissolved, in bankruptcy) is not available from the provided search results. The patent pertains to methods and apparatus for sulfonating plastic articles during molding to decrease permeability and protect the polymeric material.

Assignment timeline

The USPTO Assignment Center search for RE50399 yielded one record:

  • 2010-05-20 (executed) / recorded 2010-05-27 — Reel 024450/0148
    • Conveyance: ASSIGNMENT OF ASSIGNOR'S INTEREST
    • Assignor: CLARK, ANDREW C. and TOPHAM, DAVID W.
    • Assignee: SENSORTECH CORPORATION, 100 INDUSTRIAL DRIVE GREENVILLE SOUTH CAROLINA, UNITED STATES 29607
    • Correspondent: BALLARD SPAHR LLP 999 PEACHTREE STREET SUITE 1000 ATLANTA, GA 30309
    • Context: Initial assignment from inventors to an operating company.

Timeline diagram

timeline
    title Ownership of US RE50399
    2010 : Inventors assign to SENSORTECH CORP

NPE / troll-pattern signals

  1. Shell-entity transfer — Not present. The only recorded assignment is from individual inventors to "SENSORTECH CORPORATION," which appears to be an operating company based on its name and physical address provided (100 INDUSTRIAL DRIVE GREENVILLE SOUTH CAROLINA, UNITED STATES 29607). There is no indication of a transfer to a licensing-only LLC.

  2. Known asserter in the chain — Not present. SENSORTECH CORPORATION is not listed among the common NPEs provided (Acacia Research Corp, Marathon Patent Group, Intellectual Ventures, IPNav, Wi-LAN, Mosaid / Conversant, Vringo, Pendrell, Innovatio IP Ventures, MPHJ Technology, Lumen View Technology, Round Rock Research, Document Generation Corp, Erich Spangenberg entities). No other assignees are present in the chain.

  3. Repeat correspondent across the chain — Unclear. The correspondent for the single recorded assignment is BALLARD SPAHR LLP. With only one assignment in the record, it's not possible to determine if they are a repeat correspondent across this chain. There is no information provided to check if this firm appears on NPE assertion lists.

  4. Cascading transfers — Not present. Only one assignment is recorded.

  5. Pre-litigation transfer — Unclear. There is no information provided about any litigation involving this patent.

  6. Bankruptcy fire-sale — Not present. There is no indication of bankruptcy proceedings for SENSORTECH CORPORATION.

  7. Privateering — Not present. There are no transfers from an operating company to an NPE in the assignment record.

  8. Defensive aggregator (anti-NPE) — Not present. The patent is not currently assigned to a known defensive aggregator like RPX, AST, LOT Network, Unified Patents, or Open Invention Network.

Verdict

Insufficient data. The USPTO Assignment Center only shows a single assignment from the inventors to SENSORTECH CORPORATION recorded on 2010-05-27 (Reel 024450/0148). This initial assignment from inventors to what appears to be an operating company provides no signals of NPE activity. Further, there is no information available regarding subsequent transfers, litigation, or the nature of SENSORTECH CORPORATION's business beyond its name and address.

USPTO Assignment Center Search for RE50399

Generated 6/15/2026, 12:45:47 AM