Granted Patent
Utility
US 4,959,992 · App. 07/338,952
Piezo-electric transducer test apparatus
Inventor:
Robert G. Gentles
Patented Case
View Patent ↗
Granted: Oct 2, 1990
Filed: Apr 17, 1989
Inventor
Robert G. Gentles
Assignee (at issue)
The Marconi Company Limited
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.