Granted Patent
Utility
US 5,009,104 · App. 07/443,637
Ultrasonic cure monitoring of advanced composites
Inventor:
Delwin O. Johnson
Patented Case
View Patent ↗
Granted: Apr 23, 1991
Filed: Nov 30, 1989
Inventor
Delwin O. Johnson
Assignee (at issue)
General Dynamics 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.