Granted Patent
Utility
US 4,305,348 · App. 05/953,476
Seal for an internal combustion engine
Inventor:
Jon W. Martin
Patented Case
View Patent ↗
Granted: Dec 15, 1981
Filed: Oct 23, 1978
Inventor
Jon W. Martin
Assignee (at issue)
Ramsey Foundation
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.