Granted Patent
Utility
US 4,653,085 · App. 06/654,885
Telephone switching system adjunct call processing arrangement
Inventors:
Norman C. Chan, Leif Pederson
Patented Case
View Patent ↗
Granted: Mar 24, 1987
Filed: Sep 27, 1984
Inventors
Norman C. Chan
Leif Pederson
Assignees (at issue)
AT&T CORP.
AT&T Information Systems 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.