Granted Patent
Utility
US 5,196,343 · App. 07/592,678
Ultrasonic calibration material and method
Inventors:
Moustafa Zerhouni, Mohammed Rachedine
Patented Case
View Patent ↗
Granted: Mar 23, 1993
Filed: Oct 4, 1990
Inventors
Moustafa Zerhouni
Mohammed Rachedine
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.