In the Gandy v. Main Belting Company case of 1891, the U.S Supreme Court ruled on a dispute involving patent rights. The plaintiff, Gandy, alleged that he had been granted a patent for an improved method and apparatus for making rubber belting and hose in 1879. He claimed that Main Belting Company infringed upon his patent by using his invention without permission or compensation. However, the defendant argued that they were not infringing because their process was different from what was described in Gandy's patent. The court found in favor of the defendant after examining both processes closely. They concluded that while there might be similarities between them, these did not constitute infringement as they were fundamentally different methods with distinct steps involved. This decision underscored two key principles: firstly, patents are only valid if they describe new inventions clearly and specifically; secondly, even minor differences can distinguish one process from another to avoid infringement claims.

In the dissenting opinion for Gandy v. Main Belting Company, it was argued that the majority's decision to uphold a patent infringement claim against Gandy was incorrect because there wasn't enough evidence to prove that he had infringed on any of Main Belting Company's patents. The dissenting justices believed that the similarities between Gandy's product and those patented by Main Belting were superficial at best and did not constitute an infringement of intellectual property rights. They also took issue with how the lower courts handled this case, arguing they failed to properly apply legal standards in their assessment of whether or not a patent violation occurred. In conclusion, these justices felt strongly that upholding such claims without substantial proof could set a dangerous precedent for future cases involving alleged patent violations.