Granted Patent
Utility
US 4,173,129 · App. 05/895,889
Universal joint structure with improved seal
Inventor:
Donald F. Durham
Patented Case
View Patent ↗
Granted: Nov 6, 1979
Filed: Apr 13, 1978
Inventor
Donald F. Durham
Assignee (at issue)
Caterpillar Tractor Co.
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.