Granted Patent
Utility
US 4,537,346 · App. 06/542,522
Fail-safe oil flow control apparatus
Inventor:
Wayne R. Duprez
Patented Case
View Patent ↗
Granted: Aug 27, 1985
Filed: Oct 17, 1983
Inventor
Wayne R. Duprez
Assignee (at issue)
Standard-Thomson Corporation
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.