In the 1949 case Graver Tank & Mfg. Co., Inc. et al v. Linde Air Products Co., the U.S Supreme Court addressed issues of patent infringement and doctrine of equivalents, a legal rule in most of the world's patent systems that allows a court to hold a party liable for patent infringement even though the infringing device or process does not fall within the literal scope of a patent claim, but nevertheless is equivalent to the claimed invention. The plaintiff, Linde Air Products Company, alleged that Graver Tank & Manufacturing Company had infringed on its patented method for electric welding by using an equivalent substance in their own welding process. The Supreme Court ruled in favor of Linde Air Products Co., stating that if two devices do substantially similar work in substantially similar ways to achieve identical results they are considered as same even though they differ in name form or shape; thus establishing what has become known as "the Doctrine of Equivalents". This ruling expanded protections afforded by patents and provided greater security against imitations not identical but serving same purpose.

In the dissenting opinion for Graver Tank & Mfg. Co., Inc. v. Linde Air Products Co., Justice Jackson argued that the majority's decision expanded patent protection beyond its intended scope, thereby stifling innovation and competition in violation of antitrust laws. He contended that patents should only protect specific inventions rather than general ideas or principles, which he believed was not the case with Linde's patent on electric welding using a flux composed of alkaline earth metal silicates. According to him, this broad interpretation could potentially grant monopolies over entire fields of technology based on vague claims about basic scientific concepts or natural phenomena - an outcome contrary to both patent law and public policy objectives promoting technological progress and economic growth.