4. Telephonic communications
  5. Supervisory or control line signaling
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Intelligent telephone system and method for determining dialing

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Interface circuit to quickly establish a loop current

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Interference attenuation for acoustic-dialers

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

International call prefix identification and formatting

Telephonic communications – Supervisory or control line signaling – Substation originated
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Interrupted tone converter

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Interswitch line circuit

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Intrinsically safe telephone

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

IP telephone apparatus and IP telephone system

Telephonic communications – Supervisory or control line signaling – Substation originated
Reexamination Certificate

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ISDN interface unit with separate ring generator

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0
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