The United States federal constitution 1787 stipulates that "in order to promote scientific and technological progress, Congress will grant inventors limited exclusive rights for a certain period of time."
1790, based on this constitution, the American patent law was promulgated, which was the most systematic and comprehensive patent law at that time.
1 U.S. patent authorized according to the U.S. Patent Law appeared on1Jul. 3, 9901day, which is about the manufacturing method of potassium carbonate.