Granted Patent
Utility
US 4,583,596 · App. 06/776,066
Dual metal seal for a well safety valve
Inventor:
Jonathan Paul Davis
Patented Case
View Patent ↗
Granted: Apr 22, 1986
Filed: Sep 13, 1985
Inventor
Jonathan Paul Davis
Assignee (at issue)
Camco 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.