Patent 9151557
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 review) on file for U.S. Patent No. 9,151,557 as of today's date. This means the patent has not been challenged in any PTAB proceedings, leaving all claims (1-20) untested by these administrative review mechanisms. For a defendant, this signifies that the patent claims have not been subjected to the scrutiny of an inter partes review before the PTAB, nor have any claims been invalidated, sustained, or settled through such processes. The patent remains unhardened in this respect.
Strategic summary
All twenty claims of U.S. Patent No. 9,151,557 are currently UNTESTED in AIA trial proceedings. There have been no PTAB challenges, meaning no claims have been canceled or confirmed patentable through these administrative reviews. Consequently, there is no estoppel landscape to navigate under 35 U.S.C. § 315(e)(2) from prior PTAB decisions, as no grounds were raised or could have been raised in a completed IPR or PGR.
The absence of PTAB activity is a notable signal. Well-asserted patents often become targets for IPRs or PGRs, especially those that are litigated. The lack of such challenges for U.S. Patent No. 9,151,557 might suggest it has not been extensively asserted, or that potential petitioners have not yet identified strong prior art challenges meeting the PTAB institution thresholds.
Recommended next steps
Since no PTAB activity exists for U.S. Patent No. 9,151,557, a defendant facing assertion of this patent should consider the following:
- Conduct a thorough prior art search: With no prior PTAB proceedings, all prior art grounds (§ 102 and § 103 for IPR; broader grounds including § 101, § 112 for PGR, if eligible) are still available for a potential PTAB challenge.
- Evaluate eligibility for PGR vs. IPR: U.S. Patent No. 9,151,557 was issued on October 6, 2015. A Post-Grant Review (PGR) petition must be filed within nine months of the patent's issue date. As of today, May 15, 2026, the nine-month window for PGR has long passed. Therefore, any future PTAB challenge would need to be an Inter Partes Review (IPR), which is limited to prior art consisting of patents or printed publications under § 102 or § 103.
- Assess potential for IPR petition: If a strong prior art case can be made against the claims, filing an IPR petition could be a viable defensive strategy. This would put the patent's validity before the PTAB in a forum often considered less costly than district court litigation.
Generated 5/15/2026, 6:00:23 PM