Granted Patent
Utility
US 4,276,786 · App. 06/127,997
Boot seal
Inventor:
Joseph G. Langenstein
Patented Case
View Patent ↗
Granted: Jul 7, 1981
Filed: Dec 5, 1979
Inventor
Joseph G. Langenstein
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.