Granted Patent
Utility
US 4,058,349 · App. 05/727,880
Pressure holding valve
Inventor:
John M. Ury
Patented Case
View Patent ↗
Granted: Nov 15, 1977
Filed: Sep 29, 1976
Inventor
John M. Ury
Assignee (at issue)
Wagner Electric 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.