Granted Patent
Utility
US 5,116,292 · App. 07/739,229
Variable drive transmission
Inventor:
Kyung Soo Han
Patented Case
View Patent ↗
Granted: May 26, 1992
Filed: Aug 1, 1991
Inventor
Kyung Soo Han
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.