Granted Patent
Utility
US 4,977,655 · App. 07/340,383
Method of making a transducer
Inventor:
Michael A. Martinelli
Patented Case
View Patent ↗
Granted: Dec 18, 1990
Filed: Apr 18, 1989
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.