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Timed telephone silencer. (telephone silencer with timer functio

Telephonic communications – Call or terminal access alarm or control – At substation
Patent

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Timer control for telephone

Telephonic communications – Call or terminal access alarm or control – At substation
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Timing circuit and a secure telephone jack utilizing this circui

Telephonic communications – Call or terminal access alarm or control – At substation
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Toll call restrictor method and apparatus

Telephonic communications – Call or terminal access alarm or control – At substation
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Toll fraud control

Telephonic communications – Call or terminal access alarm or control – Fraud or improper use mitigating or indication
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Toll-free number blocking override indicator

Telephonic communications – Call or terminal access alarm or control – At switching center
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Transparent telephone access system using voice authorization

Telephonic communications – Call or terminal access alarm or control
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Unauthorized call defeat apparatus

Telephonic communications – Call or terminal access alarm or control – At substation
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Universal outgoing call restriction circuit

Telephonic communications – Call or terminal access alarm or control – At substation
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Virtual private switched telecommunications network

Telephonic communications – Call or terminal access alarm or control – Fraud or improper use mitigating or indication
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Virtual private switched telephone network

Telephonic communications – Call or terminal access alarm or control – Fraud or improper use mitigating or indication
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Voice network access system

Telephonic communications – Call or terminal access alarm or control – At switching center
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0
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