Granted Patent
Utility
US 4,308,931 · App. 06/114,437
Guard for drive shaft in an articulated tractor
Inventor:
Jagdish C. Khanna
Patented Case
View Patent ↗
Granted: Jan 5, 1982
Filed: Jan 22, 1980
Inventor
Jagdish C. Khanna
Assignee (at issue)
International Harvester Company
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.