Granted Patent
Utility
US 4,991,440 · App. 07/474,898
Method of ultrasonically measuring thickness and characteristics of zirconium liner coextruded with zirconium tube
Inventors:
Michael J. Pleinis, David Allen
Patented Case
View Patent ↗
Granted: Feb 12, 1991
Filed: Feb 5, 1990
Inventors
Michael J. Pleinis
David Allen
Assignee (at issue)
Westinghouse Electric Company LLC
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.