Patent 9363997

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 suggesting inventor departures prior to a portfolio fire-sale are immediately evident from the provided information.

Original assignee

Enviro Tech Chemical Services Inc. is the original assignee. Enviro Tech Chemical Services Inc. is a company that manufactures and supplies peracetic acid and other antimicrobial and disinfectant products, which would embody the claims of US9363997. The company appears to be currently operating.

Assignment timeline

The USPTO Assignment Center search for US Patent 9363997 (US9363997) shows no recorded assignments after issuance.

Timeline diagram

timeline
    title Ownership of US 9363997
    2011 : Priority date
    2015 : Application filed by Enviro Tech Chemical Services Inc
    2016 : Granted to Enviro Tech Chemical Services Inc

NPE / troll-pattern signals

  1. Shell-entity transfer — not present (no recorded assignments)
  2. Known asserter in the chain — not present (no recorded assignments)
  3. Repeat correspondent across the chain — not present (no recorded assignments)
  4. Cascading transfers — not present (no recorded assignments)
  5. Pre-litigation transfer — unclear (While Google Patents indicates litigation, there are no recorded assignments to assess if a transfer occurred within 6 months of the first suit.)
  6. Bankruptcy fire-sale — not present (no recorded assignments or indication of bankruptcy for the original assignee)
  7. Privateering — unclear (no recorded assignments or public information to suggest this)
  8. Defensive aggregator (anti-NPE) — not present (no recorded assignments to such entities)

Verdict

Insufficient data. There are no recorded assignments for US9363997 in the USPTO Assignment Center. Therefore, it is not possible to assess NPE/troll patterns based on assignment records. While Google Patents indicates litigation related to this patent, without assignment records, we cannot determine if the litigation is associated with an NPE.

USPTO Assignment Center search: https://assignmentcenter.uspto.gov/

Generated 5/23/2026, 12:46:21 PM