Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Automatic call coverage for unattended PBX stations

Automatic call coverage for unattended PBX stations

US Patent 4682354 · Granted Jul 21, 1987

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Call-load-control arrangement for an emergency-call-answering center1993
Arrangement for obtaining information about abandoned calls1990
PBX integrity arrangement for maintaining the functional integrity of PBX commun1987
PBX security system for monitoring security guard tours1987
Methods and apparatus for providing enhanced announcements in a telephone system1984