Granted Patent
Utility
US 4,764,907 · App. 06/860,361
Underwater transducer
Inventors:
David K. Dahlstrom, Merrill E. Fife, Charles R. Judy
Patented Case
View Patent ↗
Granted: Aug 16, 1988
Filed: Apr 30, 1986
Inventors
David K. Dahlstrom
Merrill E. Fife
Charles R. Judy
Assignee (at issue)
ALLIED CONSULTING, 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.