Patent 5115326
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.
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
A comprehensive search of the USPTO's Open Data Portal and general web searches for Patent Trial and Appeal Board (PTAB) proceedings concerning U.S. Patent 5,115,326 have yielded no results. As of 2026-05-30, there are no active, concluded, or settled AIA trial proceedings (Inter Partes Review, Post-Grant Review, or Covered Business Method review) on file for this patent. This indicates that the patent's claims remain untested by the PTAB.
Strategic summary
As there are no PTAB proceedings on file, all claims of U.S. Patent 5,115,326 (claims 1-10) remain untested and fully intact. There is no estoppel landscape to consider from prior PTAB challenges, as none have occurred. The absence of PTAB activity is a notable signal, as patents that are actively asserted or of significant commercial interest often become targets for IPRs or other AIA trials.
Recommended next steps
Since no PTAB activity exists for U.S. Patent 5,115,326, there are no specific Final Written Decisions or institutional decisions to cite. For a potential defendant facing assertion of this patent today, the primary defensive strategies would lie outside the PTAB, such as in district court litigation challenging validity or non-infringement, or exploring licensing options. The lack of PTAB challenges could suggest either that the patent has not been widely asserted, or that prior art challenges were not considered viable enough to warrant a PTAB petition.
Generated 5/30/2026, 12:45:47 AM