Granted Patent
Utility
US 4,885,831 · App. 07/249,382
Method for forming a contour hardened gear
Inventor:
Gregory A. Fett
Patented Case
View Patent ↗
Granted: Dec 12, 1989
Filed: Sep 26, 1988
Inventor
Gregory A. Fett
Assignee (at issue)
DANA LIMITED
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.