Granted Patent
Utility
US 4,958,520 · App. 07/431,366
Digital piezoresistive pressure transducer
Inventors:
Craig Stephen Trommler, Mark Finefrock
Patented Case
View Patent ↗
Granted: Sep 25, 1990
Filed: Nov 1, 1989
Inventors
Craig Stephen Trommler
Mark Finefrock
Assignee (at issue)
Bourns Instruments, Inc.
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.