Patent 5602377
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 currently no AIA trial proceedings on file for U.S. Patent 5,602,377 as of May 22, 2026. Therefore, all claims of the patent remain untested by PTAB. This means a defendant facing assertion of this patent will need to develop an initial defensive posture without the benefit of prior PTAB challenges.
Strategic summary
All claims of U.S. Patent 5,602,377 (claims 1-26) are currently untested by PTAB proceedings. No claims have been canceled or sustained in an AIA trial. The estoppel landscape is entirely open, meaning a potential defendant is not barred from raising any ground of invalidity (e.g., prior art under § 102 or § 103) that they deem relevant. There are no patterns of repeated challenges by specific petitioners or aggressive appeals by the patent owner visible in PTAB records for this patent. The absence of PTAB activity suggests that this patent may not have been asserted extensively in recent years or has not been deemed a prime target for IPRs by potential challengers.
Recommended next steps
As there is no PTAB activity on file for U.S. Patent 5,602,377, the recommended next steps for a defendant are to conduct a thorough prior art search to identify potential invalidity grounds for an inter partes review (IPR) or post-grant review (PGR) petition, if applicable. The absence of prior challenges means that the initial burden of establishing unpatentability rests entirely with any new petitioner. This initial search should leverage the prior art cited during prosecution of US 5,602,377 (e.g., U.S. Patent 5,354,977 and U.S. Patent 5,286,960, as discussed in the Obviousness section) as a starting point.
Generated 5/22/2026, 4:30:22 PM