Granted Patent
Utility
US 4,628,753 · App. 06/676,739
Lightweight ring gear for a differential
Inventors:
Charles F. Heine, Richard L. Pifer
Patented Case
View Patent ↗
Granted: Dec 16, 1986
Filed: Nov 29, 1984
Inventors
Charles F. Heine
Richard L. Pifer
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.