Granted Patent
Utility
US 4,739,664 · App. 07/017,291
Absolute fluid pressure sensor
Inventor:
Robert E. Hetrick
Patented Case
View Patent ↗
Granted: Apr 26, 1988
Filed: Feb 20, 1987
Inventor
Robert E. Hetrick
Assignee (at issue)
Ford Motor 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.