Granted Patent
Utility
US 5,301,246 · App. 07/921,164
Data communications equipment security device using calling party directory number
Inventors:
James L. Archibald, Steven D. Hunt, Richard K. Smith
Patented Case
View Patent ↗
Granted: Apr 5, 1994
Filed: Jul 29, 1992
Inventors
James L. Archibald
Steven D. Hunt
Richard K. Smith
Assignee (at issue)
AT&T Bell Laboratories
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.