Granted Patent
Utility
US 4,853,503 · App. 07/249,214
Pressure switch apparatus having improved longevity and widened tolerance for location of stationary contact
Inventor:
Carlton E. Sanford
Patented Case
View Patent ↗
Granted: Aug 1, 1989
Filed: Sep 26, 1988
Inventor
Carlton E. Sanford
Assignee (at issue)
Texas Instruments Incorporated
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.