Granted Patent
Utility
US 4,333,028 · App. 06/243,490
Damped acoustic transducers with piezoelectric drivers
Inventor:
Stanley Panton
Patented Case
View Patent ↗
Granted: Jun 1, 1982
Filed: Mar 13, 1981
Inventor
Stanley Panton
Assignee (at issue)
Milltronics Ltd.
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.