In the 1908 case of Sand Filtration Corporation of America v. Cowardin, the U.S. Supreme Court dealt with a dispute over patent rights for an invention related to water filtration systems. The plaintiff, Sand Filtration Corporation of America, alleged that the defendant, Cowardin, had infringed on their patent by using and selling their patented system without permission or license from them. However, Cowardin argued that he was not infringing because his system was based on a different principle than what was claimed in the plaintiff's patent and therefore did not fall under its scope. The court ruled in favor of Cowardin stating that there were significant differences between his method and the one described in Sand Filtration’s patents; hence no infringement occurred. The decision emphasized how important it is for inventors to clearly specify what they claim as their invention when applying for a patent since any ambiguity can lead to legal disputes later on.

In the dissenting opinion for the case of Sand Filtration Corporation of America v. Cowardin, it was argued that the majority's decision to uphold a lower court ruling against Sand Filtration Corporation was incorrect. The dissenting justices believed that there were significant errors in how evidence had been interpreted and applied by both the trial court and their fellow Supreme Court Justices. They contended that these mistakes led to an unjust outcome for Sand Filtration Corporation, which they felt had acted within its rights under existing contracts and laws. Furthermore, they disagreed with the majority's interpretation of certain legal principles related to contract law and property rights, arguing instead for a more conservative approach based on established precedent.