Granted Patent
Utility
US 4,333,552 · App. 06/153,130
Hydraulic pressure relief valve
Inventor:
Paul E. Lamarche
Patented Case
View Patent ↗
Granted: Jun 8, 1982
Filed: May 27, 1980
Inventor
Paul E. Lamarche
Assignee (at issue)
BorgWarner Inc.
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.