Patent 6108329
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.
As a senior PTAB practitioner analyzing US Patent 6,108,329, here is a report on its AIA trial history for a defendant considering their options.
Proceedings overview
There have been zero AIA trial proceedings filed against US patent 6,108,329. This defensive posture means that all claims of the patent remain untested before the PTAB, and a defendant would be the first to challenge its validity in this forum.
Strategic summary
The complete absence of PTAB challenges against US patent 6,108,329 is a significant finding. Here is a breakdown of the strategic landscape for a potential defendant:
Claim Status: All claims of US patent 6,108,329 (including independent claim 1 and dependent claim 2) are legally intact and have not been canceled or amended through any PTAB trial. They are presumed valid.
Estoppel Landscape: Because no inter partes review (IPR) or other AIA trial has ever been instituted, the estoppel provisions of 35 U.S.C. § 315(e) do not apply to any potential petitioner. A defendant is free to file an IPR petition on any ground that could be raised under § 102 (anticipation) or § 103 (obviousness) based on prior art consisting of patents or printed publications.
Pattern Signals: The patent was filed in 1996, issued in 2000, and has been expired since 2016. Its current assignee, Ironworks Patents LLC, is a known patent assertion entity that has engaged in litigation concerning other patents. The lack of PTAB proceedings against this specific patent, especially given its age and the assignee's litigation history with other assets, is unusual. It could suggest that it has not been a central asset in past assertion campaigns, or that past licenses were taken before a PTAB challenge was contemplated.
Recommended next steps
For a defendant facing an assertion of US patent 6,108,329, the path is clear from a PTAB perspective.
No PTAB Activity Exists: A thorough search of the USPTO's PTAB dockets confirms that no IPR, Post-Grant Review (PGR), or Covered Business Method (CBM) proceedings have ever been filed against this patent. A defendant would be writing on a blank slate.
Defensive IPR is an Option: Given that no prior challenges have been filed, a defendant has the full range of prior art patents and printed publications available to construct an IPR petition. The primary focus would be on demonstrating that the limitations of claim 1 were anticipated or would have been obvious at the time of the invention.
Expiration Status: It is crucial to note that this patent expired on December 6, 2016. Any alleged infringement must have occurred before this date. This significantly limits the damages period and may be a primary reason for the lack of recent challenges at the PTAB. Any demand letter citing infringement after this date would be baseless.
Generated 5/11/2026, 12:18:34 AM