Patent 9737072

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

  • Michael S. Harvey
  • Jonathan N. Howarth

Both inventors were employed by the original assignee, Enviro Tech Chemical Services, Inc., at the time of the invention. Public records do not indicate any unusual employment patterns, such as immediate departure after filing, that would suggest a forthcoming patent sale.

Original assignee

The original assignee listed on the face of US patent 9,737,072 is Enviro Tech Chemical Services Inc.

Enviro Tech is an active operating company based in Modesto, California. They manufacture and sell specialty chemicals, including a range of peracetic acid (PAA) sanitizers and disinfectants for the food, agriculture, and water treatment industries. The patent's subject matter—methods for generating PAA on-site—directly relates to their core product lines, such as their "Perasan" brand of PAA products. The company appears to be actively commercializing technology in this field.

Assignment timeline

A search of the USPTO Patent Assignment Search database reveals no recorded assignments for US patent 9,737,072. This indicates that the patent is still owned by the original assignee, Enviro Tech Chemical Services Inc.

Timeline diagram

timeline
    title Ownership of US 9737072
    2011 : Priority Date
    2016 : Application Filed by Enviro Tech
    2017 : Issued to Enviro Tech Chemical Services Inc

NPE / troll-pattern signals

  1. Shell-entity transfer: Not present. No transfer from the operating company has been recorded.

  2. Known asserter in the chain: Not present. The sole owner, Enviro Tech Chemical Services, Inc., is a manufacturing company, not a known patent assertion entity.

  3. Repeat correspondent across the chain: Not present. There are no recorded assignments.

  4. Cascading transfers: Not present. There are no recorded assignments.

  5. Pre-litigation transfer: Not present. The patent has no recorded assignments or associated litigation history.

  6. Bankruptcy fire-sale: Not present. Enviro Tech Chemical Services, Inc. is an active and operating business.

  7. Privateering: Not present. There is no evidence of the patent being transferred to a third party for assertion purposes.

  8. Defensive aggregator (anti-NPE): Not present. The patent has not been transferred to a defensive aggregator.

Verdict

  • Insufficient data

There are no recorded assignments for US patent 9,737,072. The patent remains with the original inventor-assignee, Enviro Tech Chemical Services, Inc., an active operating company whose commercial products align with the patented technology. The absence of any recorded transfers means there are no signals of NPE or patent-troll activity to analyze.

Verify at: USPTO Assignment Search for US 9,737,072

Generated 5/14/2026, 12:48:34 AM