Patent 9271536

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.

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Inventors

Original assignee

Brainguard Technologies Inc. is listed as the original assignee on the issued patent US9271536B2.
Based on the patent's subject matter ("Biomechanics aware protective gear") and the company name, their primary line of business appears to be the development of protective gear, particularly helmets, designed to mitigate complex forces (impact, rotational, shear) on the brain.
Regarding its current status, the Google Patents page indicates "Family has litigation" with a PTAB case and a US district court case filed in California Central District Court. This suggests Brainguard Technologies Inc. is active and potentially asserting its patents.

Assignment timeline

I performed a search on the USPTO Assignment Center (https://assignmentcenter.uspto.gov/) for patent number US9271536.

No recorded assignments were found for US9271536 other than the original assignment to Brainguard Technologies Inc. This means that Brainguard Technologies Inc. remains the recorded owner of the patent.

Timeline diagram

timeline
    title Ownership of US 9271536
    2015 : Application filed by Brainguard Technologies Inc
    2016 : Patent issued to Brainguard Technologies Inc

NPE / troll-pattern signals

  1. Shell-entity transfer — Not present. The patent remains with the original assignee, Brainguard Technologies Inc.
  2. Known asserter in the chain — Not present. Brainguard Technologies Inc. is not identified as a known NPE on major public lists.
  3. Repeat correspondent across the chain — Not present. There is only one recorded assignment to the original assignee, so no chain exists to show recurrence.
  4. Cascading transfers — Not present. No transfers have been recorded.
  5. Pre-litigation transfer — Unclear. While there is litigation associated with the patent (IPR2025-01031 and case 8:24-cv-02652), there are no recorded assignments preceding this litigation to indicate a pre-litigation transfer.
  6. Bankruptcy fire-sale — Not present. No evidence of bankruptcy or subsequent sale.
  7. Privateering — Unclear. There's no public evidence in the assignment records or the provided patent details to suggest privateering.
  8. Defensive aggregator (anti-NPE) — Not present. The patent is still held by Brainguard Technologies Inc., not a defensive aggregator.

Verdict

Operating-company assertion.
The patent US9271536 is currently owned by its original assignee, Brainguard Technologies Inc. There are no recorded assignments of the patent, indicating continuous ownership by an entity that appears to be developing and marketing biomechanics-aware protective gear, as evidenced by their website and related patent activities (e.g., "BrainGuard – Brain protecting helmets for Sports, Athletics, Industrial safety"). The litigation activity noted in the patent's Google Patents legal events suggests that Brainguard Technologies Inc. is actively asserting its intellectual property.

USPTO Assignment Center Search for US9271536

Generated 5/19/2026, 6:46:28 PM