The U.S. Supreme Court case Timken Roller Bearing Company v. Pennsylvania Railroad Company in 1926 revolved around a dispute over the patent rights of roller bearings used in railroad cars. The Timken Roller Bearing Company claimed that the Pennsylvania Railroad had infringed upon their patented design, and sought damages for this alleged infringement. However, the court ruled against Timken, stating that they could not claim exclusive rights to a product simply because it was an improvement on existing designs or technology; rather, they needed to demonstrate that their product was novel and non-obvious compared to what already existed at the time of invention. Furthermore, even if such novelty were proven, any patent would only cover those specific improvements made by them and not extend broadly over all uses of roller bearings in railroads.

The dissenting opinion in the case of Timken Roller Bearing Company v. Pennsylvania Railroad Company argued that the majority's decision to uphold a lower court ruling, which found Timken liable for damages caused by defective roller bearings supplied to Pennsylvania Railroad, was incorrect. The dissent contended that there was insufficient evidence presented at trial proving that the defects were due to negligence on part of Timken and not simply wear and tear or misuse by Pennsylvania Railroad. Furthermore, it disagreed with the majority's interpretation of contract law principles applied in this case; specifically, they believed that as per their agreement, liability should only arise if negligence could be proven beyond reasonable doubt - a standard they felt had not been met during proceedings. They also expressed concern about potential implications this ruling might have on future cases involving supplier-customer disputes over product quality issues.