In the case of Deering v. Winona Harvester Works, the U.S Supreme Court dealt with a patent dispute over harvesting machinery. The plaintiff, William Deering & Company, alleged that Winona Harvester Works had infringed upon their patents for improvements in grain binders and harvesters. However, the defendant argued that these patents were invalid as they lacked novelty and inventiveness - key requirements for patentability under U.S law. The court ruled in favor of Winona Harvester Works stating that there was no infringement because Deering's patents were indeed invalid due to lack of novelty and non-obviousness. The decision emphasized on principles such as prior use or knowledge which can invalidate a patent if it is shown to have existed before the date of invention claimed by an applicant. This case underscored how critical it is for inventions seeking patent protection to be both novel (new) and non-obvious (inventive). It also highlighted how evidence from prior art - any information made available to public before filing date - can be used effectively in challenging validity of a granted patent.

In the dissenting opinion for Deering v. Winona Harvester Works, Justice Brewer expressed his disagreement with the majority's decision to uphold a lower court ruling that found in favor of Deering on grounds of patent infringement. He argued that there was insufficient evidence to prove that Winona had infringed upon Deering's patent rights and believed it was wrong for the Court to assume so without concrete proof. Furthermore, he contended that even if there were similarities between the two companies' machines, this did not necessarily mean one copied from another as such similarities could have arisen independently or coincidentally. Therefore, he felt it unjustified to penalize Winona based on mere assumptions rather than solid facts.