Granted Patent
Utility
US 4,354,526 · App. 06/177,387
Control valves
Inventor:
Robert F. Hodgson
Patented Case
View Patent ↗
Granted: Oct 19, 1982
Filed: Aug 12, 1980
Inventor
Robert F. Hodgson
Assignee (at issue)
Commercial Shearing, Inc.
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.