Granted Patent
Utility
US 4,846,212 · App. 06/246,316
Bleed valve assembly for double block and bleed system
Inventors:
William B. Scobie, Daniel P. Kusmer
Patented Case
View Patent ↗
Granted: Jul 11, 1989
Filed: Sep 19, 1988
Inventors
William B. Scobie
Daniel P. Kusmer
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.