Ono těch soudních sporů kolem žárovky bylo docela hodně. Měl jsem na mysli tuto
Wikipedie:
The United States Patent Office gave a ruling October 8, 1883, that Edison's patents were based on the prior art of William Sawyer and were invalid. Litigation continued for a number of years. Eventually on October 6, 1889, a judge ruled that Edison's electric light improvement claim for "a filament of carbon of high resistance" was valid.
Příp. http://en.wikipedia.org/wiki/Heinrich_Göbel
Jinak to ale dost připomíná dnešní patentové spory.