Granted Patent
Utility
US 4,862,893 · App. 07/151,394
Ultrasonic transducer
Inventor:
Michael A. Martinelli
Patented Case
View Patent ↗
Granted: Sep 5, 1989
Filed: Feb 2, 1988
Inventor
Michael A. Martinelli
Assignee (at issue)
Intra-Sonix, Inc.
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.