Granted Patent
Utility
US 4,446,422 · App. 06/324,367
Methods of and apparatus for detecting, measuring, and classifying insulation defects
Inventors:
Paul G. Koehler, Thomas P. Leahy, Thomas P. Lichliter
Patented Case
View Patent ↗
Granted: May 1, 1984
Filed: Nov 24, 1981
Inventors
Paul G. Koehler
Thomas P. Leahy
Thomas P. Lichliter
Assignee (at issue)
AT&T Technologies Incorporated
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.