Granted Patent
Utility
US 6,537,168 · App. 09/689,974
Variable speed transmission systems and rotary motion controls
Inventor:
Kyung Soo Han
Patented Case
View Patent ↗
Granted: Mar 25, 2003
Filed: Oct 13, 2000
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.