The U.S. Supreme Court case Cincinnati Siemens-Lungren Gas Illuminating Company v. Western Siemens-Lungren Company in 1893 revolved around a patent dispute between the two companies over gas lighting technology. The Cincinnati company had purchased patents from an inventor, Lungren, who later developed improvements on his original invention and sold these improved patents to the Western company. The court was asked to determine whether the sale of the initial patents included any future improvements made by Lungren or if they were separate entities that could be independently sold and owned. In its decision, the Supreme Court ruled that when a patent is sold without explicit conditions regarding future developments or enhancements, it does not automatically include those subsequent inventions unless specifically stated in their agreement at time of purchase. Therefore, Lungren's improved designs were considered distinct from his original patented invention and he retained rights to them until selling them separately to another entity - in this case being Western Siemens-Lungren Company.

In the dissenting opinion for Cincinnati Siemens-Lungren Gas Illuminating Company v. Western Siemens-Lungren Company, the justice argued that there was a lack of evidence to support the majority's decision. The dissent focused on whether or not an infringement had occurred and questioned if it could be proven beyond reasonable doubt. It was pointed out that there were significant differences between the patent in question and what was being used by Cincinnati Siemens-Lungren Gas Illuminating Company, which should have been enough to dismiss any claims of infringement. Furthermore, they disagreed with how much weight was given to expert testimonies during trial proceedings as these opinions did not provide concrete proof of wrongdoing but rather subjective interpretations of complex technical matters.