Gunn v. Minton

Background

Vernon Minton, an inventor, developed a trading computer system called TEXCEN and later obtained a patent based on it. After leasing TEXCEN to a brokerage more than a year before he applied for the patent, a federal court found his patent invalid under the on-sale rule. Minton sued his former lawyers in Texas state court for legal malpractice, arguing they had failed to raise an experimental-use defense in the earlier patent case. The key question became whether the federal patent statute (§1338(a)) required such malpractice claims to be heard in federal court.

Reasoning

The Court used the four-part Grable test that asks whether a federal question is necessarily raised, actually disputed, substantial to the federal system, and whether federal jurisdiction would upset the federal-state balance. It agreed the malpractice claim necessarily raises and actually disputes a patent-law issue, but found the federal question was not substantial because it is a backward-looking, hypothetical “case-within-a-case” that cannot change the prior patent outcome or control patent law generally. The Court also emphasized states’ strong interest in regulating lawyers and concluded federal courts’ exclusive patent jurisdiction should not extend to ordinary state malpractice claims.

Real world impact

The decision leaves ordinary legal malpractice claims arising from patent litigation in state courts, reserves exclusive federal patent jurisdiction for actual patent suits, and makes it unlikely that routine malpractice disputes over past patent cases will be forced into federal court. The Supreme Court reversed the Texas high court and remanded the case for further proceedings consistent with this ruling.