Granted Patent
Utility
US 5,757,897 · App. 08/350,907
Telephone switch call control unit
Inventors:
Ross J. LaBarbera, Barry W. Barge
Patented Case
View Patent ↗
Granted: May 26, 1998
Filed: Dec 7, 1994
Inventors
Ross J. LaBarbera
Barry W. Barge
Assignee (at issue)
Digital Techniques, Inc.
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.