Granted Patent
Utility
US 4,644,818 · App. 06/665,969
Differential apparatus with side-gear-centered center cam
Inventors:
Alvin A. Choma, Timothy R. Edwards
Patented Case
View Patent ↗
Granted: Feb 24, 1987
Filed: Oct 29, 1984
Inventors
Alvin A. Choma
Timothy R. Edwards
Assignee (at issue)
Tractech Inc.
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.