Granted Patent
Utility
US 4,439,641 · App. 06/298,577
Ultrasonic transducer for use in a vibratory environment
Inventor:
Richard Paglia
Patented Case
View Patent ↗
Granted: Mar 27, 1984
Filed: Sep 2, 1981
Inventor
Richard Paglia
Assignee (at issue)
Polaroid 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.