Granted Patent
Utility
US 4,762,592 · App. 06/921,142
Orbital drive evaporator
Inventor:
Yao Li
Patented Case
View Patent ↗
Granted: Aug 9, 1988
Filed: Oct 20, 1986
Inventor
Yao Li
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.