PTAB challenges

Proceedings overview

As of the date of this analysis (2026-05-31), there are no AIA trial proceedings (Inter Partes Review, Post-Grant Review, or Covered Business Method) on file for U.S. Patent 8,060,644 according to the USPTO Open Data Portal and supplementary web searches. This suggests that the patent has not been directly challenged at the PTAB.

Strategic summary

U.S. Patent 8,060,644 has not been subject to any AIA trial proceedings (IPR, PGR, or CBM) to date. Consequently, all 14 claims of the patent, including independent claims 1 and 5, remain untested by the PTAB and are presumed valid from a PTAB challenge perspective. There is no estoppel landscape established for this patent through PTAB proceedings, meaning any potential petitioner is not barred by § 315(e)(2) from raising any prior art grounds they deem appropriate. The absence of PTAB activity can sometimes indicate that the patent has not been widely asserted, or that prior art challenges have not been deemed strong enough to warrant a formal proceeding.

Recommended next steps

Given the lack of PTAB activity, a defendant facing assertion of US8060644 would need to conduct a thorough prior art search to identify potential grounds for an IPR or PGR. Without any FWDs to reference, the initial defensive strategy would involve a fresh analysis of the patent's claims against the known prior art landscape to determine the viability of a PTAB challenge.The search results provided general information about PTAB and Federal Circuit appeals, and also unrelated information about "PGR" (Progressive Corporation stock) and "IPR" (Injection Pressure Regulator in a diesel engine). None of these results specifically mention US8060644.

Therefore, the initial assessment that there are no AIA trial proceedings on file for US8060644 remains correct based on the provided "PTAB proceedings on file" block and the conducted web search.

The previous response already stated "there are no AIA trial proceedings (Inter Partes Review, Post-Grant Review, or Covered Business Method) on file for U.S. Patent 8,060,644 according to the USPTO Open Data Portal and supplementary web searches." and "all 14 claims of the patent, including independent claims 1 and 5, remain untested by the PTAB and are presumed valid from a PTAB challenge perspective." and "Without any FWDs to reference, the initial defensive strategy would involve a fresh analysis of the patent's claims against the known prior art landscape to determine the viability of a PTAB challenge."

I should reiterate this clearly, indicating that the web search confirmed the absence of proceedings.

Double-checking the prompt requirements:

• "surface every AIA trial proceeding on US patent 8060644" - None found.
• "tell a defendant what actually happened" - Nothing happened at PTAB.
• "Source the proceedings list from the structured 'PTAB proceedings on file' block included in this prompt (when present)" - It says "no AIA trial proceedings for this patent".
• "Use web search to fill in claim-level outcomes, judge panels, key procedural events, settlements, and any Federal Circuit appeals" - Web search did not find any specific proceedings for this patent.
• "Do not invent proceeding numbers." - I won't.

Since no proceedings were found, the structure for each proceeding will not be filled out. I will just present the overview, strategic summary, and next steps reflecting this.

The initial response was correct and already covered this. I just need to explicitly state that the web search confirmed the lack of proceedings, rather than implying it was solely based on the ODP API block.

Final check of the generated answer against the prompt:

• Proceedings overview: One sentence stating total count (zero), breakdown by status (zero), and bottom-line defensive posture (untested, therefore not hardened or invalidated). This is covered.
• For each proceeding: This section will be omitted as there are no proceedings.
• Strategic summary:
  • Which claims are CANCELED vs. SUSTAINED vs. UNTESTED. Covered (all untested).
  • Estoppel landscape. Covered (none).
  • Pattern signals. Covered (no activity).
• Recommended next steps:
  • If claims invalidated, link to FWD. Not applicable.
  • If active proceedings, note milestones. Not applicable.
  • If no PTAB activity, say so plainly. Covered.

The previous output already addresses this, I just need to make sure the language explicitly states that the web search confirmed the initial structured data.

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I will modify the first sentence of the "Proceedings overview" to explicitly mention the web search confirmation. The rest of the previous answer remains accurate.## Proceedings overview

As of the date of this analysis (2026-05-31), there are no AIA trial proceedings (Inter Partes Review, Post-Grant Review, or Covered Business Method) on file for U.S. Patent 8,060,644 according to the USPTO Open Data Portal and confirmed by supplementary web searches. This means the patent has not been directly challenged at the PTAB, and all claims remain untested by these trial formats.

Strategic summary

U.S. Patent 8,060,644 has not been subject to any AIA trial proceedings (IPR, PGR, or CBM) to date. Consequently, all 14 claims of the patent, including independent claims 1 and 5, remain untested by the PTAB and are presumed valid from a PTAB challenge perspective. There is no estoppel landscape established for this patent through PTAB proceedings, meaning any potential petitioner is not barred by 35 U.S.C. § 315(e)(2) from raising any prior art grounds they deem appropriate. The absence of PTAB activity can sometimes indicate that the patent has not been widely asserted, or that prior art challenges have not been deemed strong enough to warrant a formal proceeding.

Recommended next steps

Given the lack of PTAB activity, a defendant facing assertion of US8060644 would need to conduct a thorough prior art search to identify potential grounds for an IPR or PGR. Without any Final Written Decisions to reference, the initial defensive strategy would involve a fresh analysis of the patent's claims against the known prior art landscape to determine the viability of a PTAB challenge. The absence of PTAB activity can be a signal in itself; well-asserted patents often eventually attract IPRs if viable prior art exists.