Patent 6314420
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.
Based on a review of the USPTO's public records and external search, no AIA trial proceedings (IPR, PGR, or CBM) have been filed against US Patent 6,314,420.
Proceedings Overview
There are zero AIA trial proceedings on file for this patent. This gives a defendant a uniquely strong defensive posture, not due to PTAB activity, but because the patent's key claims were previously invalidated in federal court, rendering subsequent PTAB challenges unnecessary.
Strategic Summary
The claims of US Patent 6,314,420 are effectively CANCELED and UNENFORCEABLE. This is not the result of a PTAB trial, but rather a final, binding decision from the U.S. Court of Appeals for the Federal Circuit. In the case I/P Engine, Inc. v. AOL, Inc., et al., the Federal Circuit reversed a lower court's infringement verdict and held that the asserted claims were invalid for obviousness. This appellate decision is a more powerful defensive tool than a PTAB Final Written Decision, as it is a binding legal precedent.
Because no PTAB proceedings were ever instituted, there is no petitioner estoppel landscape to analyze under 35 U.S.C. § 315(e)(2). The primary defensive shield against any assertion of this patent is the Federal Circuit's judgment of invalidity. Any attempt to assert this patent today would likely be considered frivolous and potentially subject to sanctions, given the clear appellate ruling.
The absence of PTAB activity is a direct signal of the patent's weakness following the court's decision. Once the Federal Circuit invalidated the claims in 2014, potential infringers had no need to spend resources on filing an IPR, as the patent was already rendered unenforceable.
Recommended Next Steps
If you are a defendant facing an assertion of US Patent 6,314,420, your primary response should be to cite its invalidation by the Federal Circuit.
The key document is the opinion from the U.S. Court of Appeals for the Federal Circuit in case number 13-1307, decided on August 15, 2014. The court's disposition states:
"Because we find that the asserted claims of the ’420 patent would have been obvious... we reverse the district court’s denial of JMOL of invalidity."
This decision effectively neutralizes the patent. An immediate motion to dismiss any new infringement complaint would be the standard defensive action, pointing to the binding precedent that has already invalidated the patent's claims.
Generated 5/11/2026, 12:45:56 PM