In the 1917 case Marconi Wireless Telegraph Company of America v. Simon, the U.S. Supreme Court dealt with a patent dispute over wireless telegraphy technology. The plaintiff, Marconi Wireless Telegraph Company of America, claimed that its patents were infringed upon by Simon's use and sale of certain apparatuses and systems for wireless telegraphy. The defendant argued that these patents were invalid due to prior art - previous similar inventions or techniques which predated them - specifically citing Sir Oliver Lodge’s “syntonic” system as an example. The court ruled in favor of Marconi on some claims but not all; it upheld his four-tuned system patent (No. 763,772) while rejecting others based on existing prior art from Nikola Tesla and John Stone Stone among others. This decision was significant because it recognized both the importance of incremental improvements in technological innovation and also set a precedent for considering 'prior art' when assessing patent validity.

In the dissenting opinion for Marconi Wireless Telegraph Company of America v. Simon, Justice Clarke argued that Tesla's patent had priority over Marconi's because it described the complete system that Marconi later claimed as his invention. He contended that Tesla’s earlier patent already contained all elements necessary to send and receive wireless signals, including an adjustable transformer (Tesla coil) used to produce high voltage, high frequency currents - a key component in radio transmission technology. Therefore, according to Justice Clarke, there was no novelty in what Marconi claimed as his own invention since it was essentially a mere application or adaptation of principles fully explained by others before him such as Sir Oliver Lodge and Nikola Tesla. The justice concluded by stating that he could not agree with the majority decision which upheld validity of some claims in Marconi’s patent while invalidating others; instead he believed none should have been held valid due to lack of originality.