Sinclair Refining Co. v. Jenkins Petroleum Process Co.

Background

A petroleum process company loaned an experimental cracking still to a refining company under an agreement that any improvements discovered would belong to the lender. An engineer employed by the refiner later obtained a patent and assigned it to his employer. The lender sued, claiming the patent was an improvement that belonged to it. After an equity suit for specific performance was dismissed, the lender amended to seek damages at law and filed a bill asking to inspect the refiner’s records about how many stills were built, when they ran, and how much gasoline they produced.

Reasoning

The Court addressed whether a bill of discovery (a request to inspect documents before trial) can be used to prove damages. It said discovery is an appropriate auxiliary tool when proving damages would otherwise be clumsy or wasteful. The Court emphasized flexibility: discovery should be limited to what is reasonably necessary, guarded by the court’s discretion, and protected against oppressive or irrelevant intrusions. The Court approved the appellate court’s approach that at first only general facts be disclosed, with fuller inspection later if the trial shows a need.

Real world impact

Companies suing for breach, especially in patent or technical cases, may obtain limited pretrial access to a defendant’s business records when needed to prove damages. The ruling does not decide who owns the patent; it only permits carefully scoped discovery to aid a later trial on ownership or damages. Courts retain discretion to deny or limit requests that are abusive or unnecessary.