IP Library › Granted Patent US 5,530,737
Granted Patent Utility
US 5,530,737 · App. 08/034,086

Secure access telephone extension system and method

Inventors: David Bartholomew, A. Ray Ivie, Alma K. Schurig
Patented Case View Patent ↗
Granted: Jun 25, 1996 Filed: Mar 22, 1993
Inventors
David Bartholomew
A. Ray Ivie
Alma K. Schurig
Assignee (at issue)
Phonex Corporation

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Quick Facts
Patent No.
US 5,530,737
App. No.
08/034,086
Filed
1993-03-22
Granted
1996-06-25
Kind
A