Patent 8379538
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
There are no AIA trial proceedings (Inter Partes Review, Post-Grant Review, or Covered Business Method) currently on file for US Patent 8379538. This indicates that the patent has not been subjected to PTAB challenges to date.
Strategic summary
As of May 23, 2026, all claims (1-21) of US8379538 are UNTESTED by any AIA trial proceeding at the PTAB. This means that no independent or dependent claims have been challenged or invalidated through IPR, PGR, or CBM trials.
The absence of PTAB proceedings means there is no estoppel landscape established under § 315(e)(2) for this patent. Any prior art grounds (under § 102 or § 103) that could be raised against the patent claims in an AIA trial are still available to a potential petitioner. There is no public record of the same petitioner filing multiple IPRs, nor any indication of aggressive PTAB appeals by the patent owner, or involvement of defensive aggregators.
Recommended next steps
Since no PTAB activity exists for US8379538, for a potential defendant facing assertion of this patent, the following is recommended:
- Prior Art Search: Conduct a thorough prior art search to identify potential grounds for an AIA trial (IPR or PGR, depending on the claims and filing date, though IPR is more common). The patent's priority date is June 22, 2005.
- Validity Analysis: Perform a detailed validity analysis of all asserted claims against any newly found or existing prior art, focusing on anticipation (§ 102) and obviousness (§ 103) grounds.
- Consider Petition Filing: If strong prior art grounds are identified, consider filing an IPR or PGR petition, especially if facing litigation. The absence of prior PTAB challenges means this avenue remains open without the burden of estoppel from previous proceedings.
Generated 5/23/2026, 12:45:35 AM