Granted Patent
Utility
US 4,337,814 · App. 06/261,114
Air valve conduit in the track wall of a tire
Inventor:
Charles E. Grawey
Patented Case
View Patent ↗
Granted: Jul 6, 1982
Filed: Sep 22, 1980
Inventor
Charles E. Grawey
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.