Granted Patent
Utility
US 5,552,897 · App. 08/206,710
Secure communication apparatus and method
Inventors:
Richard Mandelbaum, B. Waring Partridge, III
Patented Case
View Patent ↗
Granted: Sep 3, 1996
Filed: Mar 7, 1994
Inventors
Richard Mandelbaum
B. Waring Partridge, III
Assignee (at issue)
AT&T CORP.
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.