In the case of George A. Ohl & Co. v. A.L Smith Iron Works, the U.S Supreme Court ruled in favor of A.L Smith Iron Works, affirming a lower court's decision that George A. Ohl & Co had infringed on their patent rights for an iron-working machine part known as a 'die'. The dispute centered around whether or not Ohl's design was sufficiently different from Smith's to avoid infringement and if it constituted a new invention altogether. The Supreme Court held that while there were differences between the two designs, they did not amount to significant changes in function or operation which would warrant classifying them as separate inventions. It was determined that both designs performed essentially the same work in substantially similar ways and therefore fell under the scope of Smith’s patent protection. This ruling reinforced principles regarding what constitutes sufficient novelty for patentability and clarified standards for determining when an alleged improvement upon an existing patented device is actually just an infringing imitation.

In the dissenting opinion for George A. Ohl & Co. v. A.L Smith Iron Works, it was argued that the majority's decision to uphold a lower court ruling in favor of Smith Iron Works undermined principles of fairness and justice by allowing an unjust enrichment at the expense of George A. Ohl & Co., who had performed work under a contract but were denied payment due to technicalities related to bankruptcy proceedings and jurisdictional issues between state and federal courts. The dissent emphasized that while legal procedures are important, they should not be used as tools for denying rightful claims or promoting inequitable outcomes; rather, they should serve as means for achieving substantive justice based on merits of cases.