Granted Patent
Utility
US 4,821,731 · App. 07/129,830
Acoustic image system and method
Inventors:
Michael A. Martinelli, Peter von Thuna
Patented Case
View Patent ↗
Granted: Apr 18, 1989
Filed: Dec 8, 1987
Inventors
Michael A. Martinelli
Peter von Thuna
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.