Granted Patent
Utility
US 4,604,604 · App. 06/625,988
Vapor emitting wear indicator
Inventor:
Joseph M. Mann
Patented Case
View Patent ↗
Granted: Aug 5, 1986
Filed: Jun 29, 1984
Inventor
Joseph M. Mann
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.