Granted Patent
Utility
US 4,872,148 · App. 06/587,706
Ultrasonic transducer for use in a corrosive/abrasive environment
Inventors:
John P. Kirby, Richard Paglia
Patented Case
View Patent ↗
Granted: Oct 3, 1989
Filed: Mar 8, 1984
Inventors
John P. Kirby
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.