In the case of Mergenthaler Linotype Company v. Davis et al., 1919, the U.S. Supreme Court was tasked with determining whether a patent held by Mergenthaler Linotype for its linotype machine had been infringed upon by Davis and his associates. The lower courts ruled in favor of Mergenthaler, finding that their patents were valid and had indeed been violated. However, upon reaching the Supreme Court, this decision was reversed on appeal due to lack of novelty in their invention as required under patent law standards at that time. The court found that although there may have been some minor differences between the machines produced by both parties involved in this dispute, these variations did not amount to any new or novel invention deserving protection under a separate patent right granted to Mergenthaler Linotype Company. This ruling highlighted an important aspect of intellectual property rights - while it is crucial for innovators to be rewarded for their inventions through exclusive rights provided by patents; such protections should not stifle competition or impede progress within an industry simply because one company holds certain patents.

The dissenting opinion in the Mergenthaler Linotype Company v. Davis et al., case argued that the majority's decision to uphold a patent on a machine part was incorrect. The dissent believed that the patented item, an automatic distributor for typesetting machines, did not meet the criteria of novelty and non-obviousness required for patent protection. They contended that similar devices had been used in other industries prior to this invention, making it unoriginal and therefore ineligible for patent rights. Furthermore, they asserted that any skilled mechanic could have easily come up with such an improvement without requiring inventive genius or skill beyond ordinary mechanical ability - thus failing to satisfy the non-obviousness criterion as well. Therefore, according to them, granting a monopoly through a patent under these circumstances would stifle competition rather than promote innovation as intended by patent laws.