Granted Patent
Utility
US 4,682,354 · App. 06/677,802
Automatic call coverage for unattended PBX stations
Inventor:
Vincent D. Vanacore
Patented Case
View Patent ↗
Granted: Jul 21, 1987
Filed: Dec 4, 1984
Inventor
Vincent D. Vanacore
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.