Granted Patent
Utility
US 4,976,144 · App. 07/512,095
Diagnostic apparatus and method for fluid control valves
Inventor:
William V. Fitzgerald
Patented Case
View Patent ↗
Granted: Dec 11, 1990
Filed: Apr 10, 1990
Inventor
William V. Fitzgerald
Assignee (at issue)
Fisher Controls International LLC
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.