Granted Patent
Utility
US 4,950,211 · App. 07/422,024
Track drive sprocket wheel for snow grooming vehicle
Inventor:
M. Elmer James
Patented Case
View Patent ↗
Granted: Aug 21, 1990
Filed: Oct 16, 1989
Inventor
M. Elmer James
Assignee (at issue)
Logan Manufacturing 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.