Granted Patent
Utility
US 4,378,809 · App. 06/161,098
Audio-telemetric pressure sensing systems and methods
Inventor:
Eric R. Cosman
Patented Case
View Patent ↗
Granted: Apr 5, 1983
Filed: Jun 19, 1980
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.