Granted Patent
Utility
US 4,632,360 · App. 06/292,997
Butterfly type valve seal
Inventor:
Dennis W. DeSalve
Patented Case
View Patent ↗
Granted: Dec 30, 1986
Filed: Aug 14, 1981
Inventor
Dennis W. DeSalve
Assignee (at issue)
United Aircraft Products, Inc.
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.