Granted Patent
Utility
US 4,403,513 · App. 06/005,936
Capacitive differential pressure transducer
Inventor:
John Sjolund
Patented Case
View Patent ↗
Granted: Sep 13, 1983
Filed: Jan 24, 1979
Inventor
John Sjolund
Assignee (at issue)
Sundstrand Corporation
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.