Granted Patent
Utility
US 4,281,667 · App. 05/895,954
Single diaphragm telemetric differential pressure sensing system
Inventor:
Eric R. Cosman
Patented Case
View Patent ↗
Granted: Aug 4, 1981
Filed: Apr 13, 1978
Inventor
Eric R. Cosman
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.