IP Library › Granted Patent US 4,672,654
Granted Patent Utility
US 4,672,654 · App. 06/680,932

PBX security system for monitoring security guard tours

Inventor: Vincent D. Vanacore
Patented Case View Patent ↗
Granted: Jun 9, 1987 Filed: Dec 12, 1984
Inventor
Vincent D. Vanacore
Assignees (at issue)
AT&T CORP.
AT&T Information Systems Inc.

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Quick Facts
Patent No.
US 4,672,654
App. No.
06/680,932
Filed
1984-12-12
Granted
1987-06-09
Kind
A