Granted Patent
Utility
US 4,889,158 · App. 07/237,503
Pressure/flow compensated direct acting pressure regulator
Inventors:
Donald D. Rice, James C. Hawkins, Stanley D. Hall
Patented Case
View Patent ↗
Granted: Dec 26, 1989
Filed: Aug 26, 1988
Inventors
Donald D. Rice
James C. Hawkins
Stanley D. Hall
Assignee (at issue)
Fisher Controls International LLC
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.