Granted Patent
Utility
US 4,324,383 · App. 06/186,290
Seat centerline operated butterfly valve
Inventor:
Anthony J. Ferro
Patented Case
View Patent ↗
Granted: Apr 13, 1982
Filed: Sep 11, 1980
Inventor
Anthony J. Ferro
Assignee (at issue)
Allis-Chalmers 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.