Granted Patent
Utility
US 4,322,975 · App. 06/126,304
Ultrasonic scanner
Inventors:
Robert Schmidt, Ewell E. Stevens
Patented Case
View Patent ↗
Granted: Apr 6, 1982
Filed: Feb 2, 1980
Inventors
Robert Schmidt
Ewell E. Stevens
Assignee (at issue)
Northrop 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.