Donald B Mcclain

US Patent:

48378194, Jun 6, 1989

Filed:

Dec 8, 1987

Appl. No.:

7/130190

Inventors:

Donald T. McClain - Richardson TX

Assignee:

Northern Telecom Limited - Montreal

International Classification:

H04M 119

US Classification:

379424

Abstract:

A security device for use with a telephone handset having a microphone and an ear transducer is disclosed. It is adapted to prevent eavesdropping while the handset is in an on-hook position. The security device is comprised of switching means disposed in the handset adapted to disable the transducers. The switching means is switched to a first state when the handset is placed within a first predetermined orientation corresponding to a secure mode and is switched to a second state when the handset is placed within a second predetermined orientation corresponding to an operative mode.

US Patent:

49426052, Jul 17, 1990

Filed:

Oct 28, 1988

Appl. No.:

7/264992

Inventors:

Donald T. McClain - Richardson TX

Assignee:

Northern Telecom Limited - Montreal

International Classification:

H04M 119

US Classification:

379424

Abstract:

A security device for use with a telephone handset having a microphone and an ear transducer is disclosed. It is adapted to prevent eavesdropping while the handset is in an on-hook position. The security device is comprised of switching assembly disposed in the handset adapted to disable the transducers. The switching assembly is switched to a first state when the handset is placed within a first predetermined orientation corresponding to a secure mode and is switched to a second state when the handset is placed within a second predetermined orientation corresponding to an operative mode.