Granted Patent
Utility
US 4,290,615 · App. 06/103,499
Butterfly valve
Inventor:
John P. Etcheverry
Patented Case
View Patent ↗
Granted: Sep 22, 1981
Filed: Dec 14, 1979
Inventor
John P. Etcheverry
Assignee (at issue)
International Telephone and Telegraph Corporation
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.