Granted Patent
Utility
US 5,509,075 · App. 08/230,993
Method of detecting unauthorized use of a communication unit in a secure communication system
Inventors:
Gary W. Grube, Timothy W. Markison, Susan L. Lukasik
Patented Case
View Patent ↗
Granted: Apr 16, 1996
Filed: Apr 21, 1994
Inventors
Gary W. Grube
Timothy W. Markison
Susan L. Lukasik
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.