New Marshall Engine Co. v. Marshall Engine Co.

Background

A company seeking to enforce a contract (the complainant) sued in a state court to make an inventor, Marshall, carry out his promise to assign an improvement claimed in patent 342,702. The dispute turned on whether later patent 725,349 belonged to the Marshall Engine Company of New Jersey or to the New Marshall Engine Company of Massachusetts. The complainant did not ask the state court to rule on the patent’s validity or seek damages for infringement. Instead it asked for specific performance to get the assignment and recording that would protect the true owner.

Reasoning

The Court considered whether the state court had power to decide ownership and order an assignment, and whether asking for an injunction went beyond that power. The opinion explained that federal courts alone handle cases that truly arise under the patent laws, but state courts may decide questions of title and enforce contracts about patents. Because the bill sought to enforce a contract and establish title, and did not ask the court to construe the patent or declare infringement, the state court properly entered a decree requiring assignment and an injunction as an incident of that relief. The Supreme Court therefore affirmed the state court’s decree.

Real world impact

The decision confirms that when a dispute is about who owns a patent or about enforcing a contract, state courts can resolve it and order transfers or related injunctions. Federal courts remain the proper forum for cases that directly challenge a patent’s validity or claim infringement. This ruling settles the parties’ rights in this case by affirming the state court’s authority to provide equitable relief.