Granted Patent
Utility
US 4,502,506 · App. 06/452,123
Valve
Inventor:
Kenneth J. Fisher
Patented Case
View Patent ↗
Granted: Mar 5, 1985
Filed: Dec 22, 1982
Inventor
Kenneth J. Fisher
Assignee (at issue)
American Sterilizer Company
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.