Granted Patent
Utility
US 4,680,972 · App. 06/689,385
Pressure transducer
Inventor:
William Wareham
Patented Case
View Patent ↗
Granted: Jul 21, 1987
Filed: Jan 7, 1985
Inventor
William Wareham
Assignee (at issue)
Dynisco, 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.