Granted Patent
Utility
US 4,787,204 · App. 07/101,512
Common relief valve
Inventor:
Roger D. Mickelson
Patented Case
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Granted: Nov 29, 1988
Filed: Sep 28, 1987
Inventor
Roger D. Mickelson
Assignee (at issue)
J. I. Case Company
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.