LandOfFree - US Patents - Listing for Telephonic communications,Substation or terminal circuitry,Conversion of signal form

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Active noise suppression system for telephone handsets and metho

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

Patent

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Adaptive telephone handset interface

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

Patent

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Adaptive telephone interface

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

Patent

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Apparatus and method for determining the presence and polarity o

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

Patent

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Apparatus and method for dual mode phone

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

Reexamination Certificate

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Apparatus for accessing function code in telephone

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

Patent

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Audio interface for satellite user terminals

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

Reexamination Certificate

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Automatic disconnect device with protected ringer

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

Patent

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Automatic hangup apparatus for restoring service to off-hook tel

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

Patent

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Automatically variable circuit of sound level of received voice

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

Patent

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