Patent 8546449

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. 2011-07-15 · reel 026778/0268 · Assignment

    Michael S. Harvey and Jonathan N. HowarthENVIRO TECH CHEMICAL SERVICES, INC.

    Correspondent: Jeffrey D. Myers

    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.

✓ Generated

Inventors

No unusual patterns noted regarding inventor departure.

Original assignee

Enviro Tech Chemical Services Inc. is an operating company primarily in the business of manufacturing and distributing EPA and FDA registered antimicrobial products, including peracetic acid and bromine technologies. They ship products embodying the claims, specifically compositions and methods for generating peracetic acid. Enviro Tech Chemical Services Inc. is currently operating.

Assignment timeline

  • 2011-07-15 (executed) / recorded 2011-07-15 — Reel 026778/0268
    • Conveyance: Assignment
    • Assignor: Michael S. Harvey and Jonathan N. Howarth
    • Assignee: ENVIRO TECH CHEMICAL SERVICES, INC.
    • Correspondent: Jeffrey D. Myers, 1855 First Street, Suite 210, Napa, CA 94559.
    • Context: Transfer from inventors to original operating company assignee.

Timeline diagram

timeline
    title Ownership of US 8546449
    2011 : Inventors assigned to Enviro Tech
    2013 : Issued to Enviro Tech Chemical Services

NPE / troll-pattern signals

  1. Shell-entity transfer — not present. The patent remains with the original operating company assignee, Enviro Tech Chemical Services Inc., a known producer of chemical solutions.
  2. Known asserter in the chain — not present. No known NPEs or patent trolls are identified in the assignment record.
  3. Repeat correspondent across the chain — not present. Only one assignment from the inventors to the original assignee is recorded, and the correspondent, Jeffrey D. Myers, has not recurred in other tracked patents on this site (based on the provided context).
  4. Cascading transfers — not present. There is only one recorded assignment in the chain.
  5. Pre-litigation transfer — unclear. While there is litigation associated with this patent (IPR2025-01472 and a US case filed in Texas Western District Court), the only recorded assignment occurred in 2011, well before the documented litigation in 2024 and 2025. Without specific dates for the first infringement suit, it's unclear if any transfers were pre-litigation.
  6. Bankruptcy fire-sale — not present. Enviro Tech Chemical Services Inc. is an active operating company.
  7. Privateering — not present. There is no evidence of a transfer to an NPE to assert on behalf of an operating company.
  8. Defensive aggregator (anti-NPE) — not present. The chain does not terminate at a known defensive aggregator.

Verdict

Insufficient data. Only the initial assignment from the inventors to the original operating company assignee, Enviro Tech Chemical Services Inc., is recorded with the USPTO. While there is current litigation activity for this patent, there are no subsequent assignment records to indicate a transfer to a shell entity, a known NPE, or any other patterns typically associated with NPE assertion.

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

Generated 5/23/2026, 6:47:54 PM