In the case of Fireball Gas Tank & Illuminating Company v. Commercial Acetylene Company and Prest-O-Lite Company, the U.S Supreme Court in 1915 was tasked with determining whether a patent held by Commercial Acetylene for an acetylene gas generator was valid or not. The plaintiff, Fireball Gas Tank & Illuminating Co., argued that the patent should be invalidated because it lacked novelty as similar devices had been previously patented. However, the defendants contended that their invention included unique features which made it distinct from prior patents. After reviewing evidence presented by both parties, including expert testimony on technical aspects of acetylene generators, the court ruled in favor of Commercial Acetylene and upheld its patent rights.

The dissenting opinion in the case of Fireball Gas Tank & Illuminating Company v. Commercial Acetylene Company and Prest-O-Lite Company argued that the majority's decision to uphold a patent for an acetylene gas tank was incorrect. The dissent contended that the patented design lacked novelty, as it merely combined existing elements without creating anything new or non-obvious. They believed this did not meet the requirements for patentability under U.S law, which requires inventions to be novel and non-obvious. Furthermore, they expressed concern about potential negative impacts on competition and innovation if such patents were granted too easily.