Patent 6164534
PTAB challenges
AIA trial proceedings at the USPTO Patent Trial and Appeal Board — IPR, PGR, and CBM. Petitioners, judge panels, claim-level invalidation outcomes from Final Written Decisions, and Federal Circuit appeals. The single most important defensive datapoint after litigation history.
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Proceedings on file (0)
All PTAB activity →AIA trial proceedings (IPR / PGR / CBM) filed at the USPTO Patent Trial and Appeal Board against this patent. Sourced from the USPTO Open Data Portal and refreshed every six hours; each proceeding number deep-links to the PTAB E2E docket.
Current assignee: Marshall Feature Recognition, LLC, Marshall Electronics Company, LLC
No PTAB proceedings on file. This patent has not been challenged via IPR, PGR, or CBM. The absence is itself a signal — well-asserted patents eventually attract IPRs. The LLM analysis below may surface filings the ODP feed hasn’t indexed yet.
PTAB challenges
AIA trial proceedings at the USPTO Patent Trial and Appeal Board — IPR, PGR, and CBM. Petitioners, judge panels, claim-level invalidation outcomes from Final Written Decisions, and Federal Circuit appeals. The single most important defensive datapoint after litigation history.
Proceedings overview
The USPTO Open Data Portal API indicates no AIA (America Invents Act) trial proceedings are on file for U.S. Patent No. 6,164,534 as of its most recent ingest. Supplemental web searches for "PTAB proceedings US6164534" and related queries also did not yield any specific IPR, PGR, or CBM trial proceedings for this patent. Therefore, there are no active, invalidated, sustained, or settled AIA trial proceedings to report. This means the patent has not been subjected to challenges under the AIA framework.
Strategic summary
As of the current date, there are no PTAB (Patent Trial and Appeal Board) proceedings on file for U.S. Patent No. 6,164,534. This implies that none of the claims (Claims 1-48) have been challenged, canceled, or sustained through an Inter Partes Review (IPR), Post-Grant Review (PGR), or Covered Business Method (CBM) patent review. All claims of US 6,164,534 remain untested by these specific post-grant mechanisms.
The absence of PTAB proceedings means there is no estoppel landscape under 35 U.S.C. § 315(e)(2) for this patent. Consequently, a defendant currently facing assertion of this patent is not barred from raising any available prior-art grounds in an AIA trial proceeding, should they choose to file one (assuming the patent were still active, which it is not). The patent expired on April 4, 2016, making new AIA trial filings impossible as they only apply to active patents. The litigation history of this patent (starting around 2007-2008) predates the introduction of AIA trial proceedings (September 2012), which explains why these mechanisms were not utilized by prior defendants.
Recommended next steps
Given that U.S. Patent No. 6,164,534 expired on April 4, 2016, there are no available PTAB proceedings to consider, and no new AIA trial proceedings can be filed against it. The patent is no longer enforceable. Therefore, for a defendant currently facing assertion of this patent, the primary recommendation is to confirm its expired status and use this as a complete defense against any claims of infringement.
Generated 5/30/2026, 12:45:56 AM