Granted Patent
Utility
US 5,381,383 · App. 08/160,311
Sonar transducer calibration apparatus and method
Inventor:
Karl L. Burfeindt
Patented Case
View Patent ↗
Granted: Jan 10, 1995
Filed: Dec 2, 1993
Inventor
Karl L. Burfeindt
Assignee (at issue)
Unisys 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.