Patent 9730443

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.

✓ Generated

Inventors

No unusual patterns were determinable from the provided information regarding inventor departures.

Original assignee

The original assignee named on the issued patent is Enviro Tech Chemical Services Inc. Enviro Tech Chemical Services Inc. is an operating company whose primary line of business appears to be the development and sale of antimicrobial, disinfectant, and other chemical solutions, including peracetic acid products. Based on available information, Enviro Tech Chemical Services Inc. is currently operating.

Assignment timeline

The USPTO Patent Assignment Search at https://assignmentcenter.uspto.gov/ was checked for US Patent 9,730,443. There are no recorded assignments for US Patent 9,730,443 subsequent to its original assignment to Enviro Tech Chemical Services Inc. This indicates that Enviro Tech Chemical Services Inc. remains the current owner of the patent.

Timeline diagram

timeline
    title Ownership of US 9730443
    2016 : Filed by Enviro Tech Chemical Services Inc
    2017 : Issued to Enviro Tech Chemical Services Inc

NPE / troll-pattern signals

  1. Shell-entity transfer — not present. The patent remains with the original operating company, Enviro Tech Chemical Services Inc.
  2. Known asserter in the chain — not present. Enviro Tech Chemical Services Inc. is not identified as a known NPE.
  3. Repeat correspondent across the chain — not present. There are no recorded assignments to show recurrence.
  4. Cascading transfers — not present. There are no recorded assignments.
  5. Pre-litigation transfer — not present. There are no recorded assignments.
  6. Bankruptcy fire-sale — not present. There are no recorded assignments indicating a transfer due to bankruptcy.
  7. Privateering — unclear. While Enviro Tech Chemical Services Inc. is an operating company, without further SEC filings or specific reporting, it is unclear if any assertion is being done on its behalf by a third party.
  8. Defensive aggregator (anti-NPE) — not present. The patent is not currently assigned to a defensive aggregator.

Verdict

Operating-company assertion.
The patent remains with its original assignee, Enviro Tech Chemical Services Inc., which is an operating company known to produce chemical solutions, including those related to peracetic acid. The ongoing litigation in the Western District of Texas (Case 1:24-cv-01313) indicates that Enviro Tech Chemical Services Inc. is asserting this patent, along with others, in a competitive context.

USPTO Assignment Center Search for US9730443

Generated 5/22/2026, 12:47:08 PM