Granted Patent
Utility
US 4,458,706 · App. 06/351,948
Block and bleed valve system
Inventor:
Alan Morris Scholes
Patented Case
View Patent ↗
Granted: Jul 10, 1984
Filed: Feb 24, 1982
Inventor
Alan Morris Scholes
Assignee (at issue)
Keystone International
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.