4. Telephonic communications
  5. Substation or terminal circuitry
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Unbalanced slic with a built-in ring circuit

Telephonic communications – Substation or terminal circuitry – Power control or detection circuit
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Universal amplified telephone handset

Telephonic communications – Substation or terminal circuitry – Amplifying
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Universal apparatus and method for interfacing signals with...

Telephonic communications – Substation or terminal circuitry – Conversion of signal form
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Universal telephone handset interface

Telephonic communications – Substation or terminal circuitry – Amplifying
Patent

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Use of handset microphone to enhance speakerphone...

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Reexamination Certificate

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User configurable telephone with alarm feature

Telephonic communications – Substation or terminal circuitry – Conversion of signal form
Patent

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User control system for internet phone quality

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0
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