Granted Patent
Utility
US 4,243,089 · App. 06/055,778
Plugs composed of two rubbers having different moduli of extension used for repairing pneumatic tires
Inventor:
Michael J. Kenney
Patented Case
View Patent ↗
Granted: Jan 6, 1981
Filed: Jul 9, 1979
Inventor
Michael J. Kenney
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.