Granted Patent
Utility
US 5,463,683 · App. 08/174,116
Blocked call notification system
Inventors:
Cynthia B. Collins, Young-Sang Lee, Daniel D. Tagatac
Patented Case
View Patent ↗
Granted: Oct 31, 1995
Filed: Dec 28, 1993
Inventors
Cynthia B. Collins
Young-Sang Lee
Daniel D. Tagatac
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.