In the case of Spencer v. Duplan Silk Company (1903), the United States Supreme Court addressed a patent dispute. The plaintiff, Charles F. Spencer, alleged that his patented invention for an improved method and apparatus for winding silk was infringed upon by Duplan Silk Company. However, the defendant argued that they had not violated any rights as their machinery did not use or embody any novel features claimed in Spencer's patent but rather used older technology already known in the industry. The lower court ruled in favor of Duplan Silk Co., stating that there was no infringement because their machines were based on prior art and thus didn't violate Spencer's patents which only covered new inventions or improvements thereof. On appeal to the Supreme Court, it upheld this decision agreeing with lower courts' findings that although similar in operation and result achieved, differences existed between mechanisms described under plaintiff’s patent claim and those employed by defendants’ machines; hence no direct infringement occurred.

In the dissenting opinion for Spencer v. Duplan Silk Company, it was argued that the patent in question should not be invalidated due to lack of novelty or non-obviousness. The dissenting justices believed that the patented invention did indeed involve an inventive step and was not merely an obvious improvement on existing technology. They also disagreed with the majority's interpretation of prior art references, arguing that these did not disclose all elements of the claimed invention and thus could not render it unpatentable. Furthermore, they contended that even if some elements were known in the prior art, their combination in this particular manner constituted a new and useful result deserving patent protection.