In the case of Dable Grain Shovel Company v. Flint in 1890, the U.S. Supreme Court was tasked with determining whether a patent for an improvement on grain shovels was valid or not. The plaintiff, Dable Grain Shovel Company, held a patent for a particular design of grain shovel and accused the defendant, Flint, of infringing upon this patent by manufacturing similar shovels without permission. However, Flint argued that the patented design was simply an obvious modification to existing designs and therefore should not have been granted protection under patent law. The court sided with Flint in its decision stating that while there were indeed differences between Dable's shovel and previous models; these changes were minor improvements rather than significant innovations deserving of a new patent. The court emphasized that patents are meant to protect truly novel inventions rather than slight modifications or enhancements to existing products. This ruling set precedent emphasizing strict interpretation when it comes to what constitutes as "novelty" under U.S Patent Law - reinforcing that only substantial innovation is worthy of such protections.

In the dissenting opinion for Dable Grain Shovel Company v. Flint, it was argued that the majority's decision to uphold a patent infringement claim against Dable Grain Shovel Company was incorrect. The dissenting justices believed that the patent in question did not meet the necessary criteria of novelty and non-obviousness required for a valid patent under U.S law. They contended that there were prior examples of similar grain shovel designs predating Flint’s patented design, which should have invalidated his claim to originality and invention. Furthermore, they disagreed with the majority's interpretation of what constitutes an 'improvement' in relation to patents, arguing that merely changing materials or proportions does not necessarily constitute an improvement if it doesn't enhance functionality or efficiency significantly enough to be considered novel or non-obvious by someone skilled in relevant art field.