News & Analysis as of

Patent Validity Assignor Estoppel Patent Invalidity

McDonnell Boehnen Hulbert & Berghoff LLP

Oral Argument in Minerva Surgical Inc. v. Hologic, Inc.

The Supreme Court heard oral argument last week in Minerva Surgical Inc. v. Hologic, Inc. over the issue of assignor estoppel. As a reminder, the case arose in an infringement suit over U.S. Patent Nos. 6,782,183 and...more

Mintz - Intellectual Property Viewpoints

Doctrine of Assignor Estoppel to be Reviewed by U.S. Supreme Court

On January 8, 2021, the U.S. Supreme Court agreed to hear a case calling for it to abolish or limit the doctrine of assignor estoppel. See Minerva Surgical, Inc. v. Hologic, Inc., et al., No. 20-440, 2021 WL 77248 (U.S. Jan....more

Knobbe Martens

Assignor Estoppel Does Not Preclude Reliance on Invalidity Decision

Knobbe Martens on

HOLOGIC, INC. v. MINERVA SURGICAL, INC. Before Wallach, Clevenger, and Stoll. Appeals from the United States District Court District of Delaware. Summary: The doctrine of assignor estoppel precludes an assignor from...more

Sterne, Kessler, Goldstein & Fox P.L.L.C.

2019 Report: Federal Circuit Appeals from the PTAB - Summaries of Key 2018 Decisions: Arista Networks, Inc. v. Cisco Sys., Inc.,...

The inventor on the patent, Dr. Cheriton, was employed by Cisco as a technical advisor and chief product architect at the time he filed the application that led to the patent. Dr. Cheriton assigned all rights to the...more

Knobbe Martens

Perhaps Assignor Estoppel Survives at the PTAB…via the District Court

Knobbe Martens on

A preliminary decision in the District Court of Delaware introduces the possibility that a patentee’s victory on assignor estoppel in the district court could quash a co-pending IPR proceeding at the PTAB. Assignor estoppel...more

Mintz - Intellectual Property Viewpoints

PTAB Invalidates Two Cisco Patents Found Valid and Infringed at the ITC

The Patent Trial and Appeal Board (“PTAB”) issued Final Written Decisions regarding Cisco’s U.S. Patent Nos. 6,377,577 (the “’577 Patent”) and 7,023,853 (the “’853 Patent”) on May 25, 2017 and U.S. Patent No. 7,224,668 (the...more

Mintz - Intellectual Property Viewpoints

CAFC’s Husky Decision Makes Sledding Tougher for Patent Owners in PTAB Appeals

The Federal Circuit recently determined that it lacked jurisdiction to review the Patent Trial and Appeal Board’s determination that assignor estoppel has no affect in an inter partes review (“IPR”). The majority’s decision...more

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