Granted Patent
Utility
US 6,439,081 · App. 09/723,689
Harmonic friction drive
Inventor:
David G. Duff
Patented Case
View Patent ↗
Granted: Aug 27, 2002
Filed: Nov 28, 2000
Inventor
David G. Duff
Assignee (at issue)
Xerox Corporation
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.