Wilbur-Ellis Co. v. Kuther

Background

The dispute involved the owner of a patent on a combination fish‑canning machine and a second‑hand buyer who purchased four used machines. The machines had been manufactured and sold under the patentee’s authorization, and the patentee had received royalties when they were originally sold. Several machines were corroded and inoperative. The buyer hired a repairer to clean, sandblast, and resize six of the 35 unpatented parts so the machines would pack smaller 5‑ounce cans instead of the original 1‑pound cans. One heavily corroded part was ground down to make it usable. The patentee sued for infringement and the lower courts ruled for the patentee.

Reasoning

The central question was whether the buyer’s work was lawful repair or unlawful reconstruction that would require making a new patented machine. The Court examined precedent and concluded these machines were not spent and had remaining useful life. The resized parts were unpatented and the size of the cans was not claimed as the invention. Because the machines had been sold outright without restrictions, the buyer could adapt and refurbish them. The Court held that resizing and replacing unpatented elements to restore or adapt the machine was repair, not reconstruction, so there was no patent infringement and the lower courts’ rulings were reversed.

Real world impact

The decision means purchasers and repair shops may refurbish and adapt lawfully bought patented machines by replacing or resizing unpatented parts to serve related uses without automatically facing infringement claims. It also confirms that an unrestricted sale conveys the right to use and adapt the machine.

Dissents or concurrances

Justice Harlan would have affirmed the lower court’s judgment, adopting the Court of Appeals’ reasoning.