Granted Patent
Utility
US 4,429,576 · App. 06/289,209
Ultrasonic inspection apparatus
Inventor:
James R. Norris
Patented Case
View Patent ↗
Granted: Feb 7, 1984
Filed: Aug 3, 1981
Inventor
James R. Norris
Assignee (at issue)
Dapco Industries, 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.