Patent 5852810
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 is no PTAB activity on file for US Patent 5852810. This indicates that the patent has not been subjected to any inter partes review (IPR), post-grant review (PGR), or covered business method (CBM) patent proceedings at the USPTO.
Strategic summary
As of today, 2026-05-16, all claims of US Patent 5852810 remain untested by any AIA trial proceeding before the PTAB. This means there are no claims that have been canceled or sustained in such proceedings. The patent expired on 2016-01-29 due to fee-related issues.
The absence of PTAB proceedings suggests a few possibilities:
- The patent may not have been asserted aggressively in litigation, thus not prompting challenges.
- The claims might be considered sufficiently robust against common prior art challenges under AIA standards, or potential challengers did not find it economically viable to pursue PTAB trials, particularly given the patent's expired status.
- The patent's focus on "geographic specific housing information" and its filing date in 1996 might place it in a technological area where earlier art was less comprehensively digitized or accessible for IPR challenges, or the specific features claimed were not easily challenged under the Alice/Mayo framework for patent eligibility (though the patent predates much of this jurisprudence's impact on CBMs and PGRs).
There is no estoppel landscape to consider as no PTAB trials have occurred.
Recommended next steps
If you are a defendant facing assertion of US Patent 5852810, the absence of PTAB activity means that all claims are currently considered valid as issued by the USPTO, without any re-examination or challenge in an AIA trial. Therefore, any prior-art grounds against this patent remain available for assertion in district court litigation or other venues, subject to the usual procedural rules and statutory bars (e.g., 35 U.S.C. § 102, 103).
Given the patent's expired status (2016-01-29), any potential infringement would be limited to activities occurring before that date. This significantly limits the scope of damages in any new litigation.
Generated 5/16/2026, 12:45:46 AM