Granted Patent
Utility
US 4,558,844 · App. 06/722,170
Direct acting valve assembly
Inventor:
William Donahue
Patented Case
View Patent ↗
Granted: Dec 17, 1985
Filed: Apr 11, 1985
Inventor
William Donahue
Assignee (at issue)
Appliance Valves 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.