Granted Patent
Utility
US 4,385,639 · App. 06/214,354
Self-cycling valve
Inventor:
Peter A. Holborow
Patented Case
View Patent ↗
Granted: May 31, 1983
Filed: Dec 8, 1980
Inventor
Peter A. Holborow
Assignee (at issue)
Automatic Switch 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.