Granted Patent
Utility
US 4,331,039 · App. 06/135,814
Gear changer
Inventor:
William G. Ruge
Patented Case
View Patent ↗
Granted: May 25, 1982
Filed: Mar 31, 1980
Inventor
William G. Ruge
Assignee (at issue)
Sperry Corp.
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.