Granted Patent
Utility
US 4,409,441 · App. 06/279,722
Ultrasonic transducer for use in a vibratory environment
Inventors:
Joseph E. Murray, Jr., Paul J. Sylvester
Patented Case
View Patent ↗
Granted: Oct 11, 1983
Filed: Jul 2, 1981
Inventors
Joseph E. Murray, Jr.
Paul J. Sylvester
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.