Granted Patent
Utility
US 4,305,622 · App. 06/156,011
Wire wheels sealing structure
Inventor:
William E. Mitchell
Patented Case
View Patent ↗
Granted: Dec 15, 1981
Filed: Jun 3, 1980
Inventor
William E. Mitchell
Assignee (at issue)
Dunlop GmbH
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.