LandOfFree - US Patents - Listing for Telephonic communications,Supervisory or control line signaling,Using line or loop condition detection

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Adaptive no balance DX signalling circuit

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

Patent

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Apparatus and method for a highly efficient low power driver...

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

Reexamination Certificate

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Apparatus and method for determining the state of a telephone li

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

Patent

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Apparatus and method for providing a telephone user with control

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

Patent

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Apparatus and method to detect telephony signaling states

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

Patent

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Apparatus for automatically recovering speech path of telephone

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

Patent

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Apparatus for remotely determining hook status conditions

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

Patent

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Apparatus for telephone extension control

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

Patent

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Apparatus for transmitting and/or receiving balanced signals on

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

Patent

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Arrangement for determining switch port status at an adjunct pro

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

Patent

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Audible signaling device for informing when a telephone line is

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

Patent

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Auxiliary attenuator arrangement for use in voice-switched speak

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

Patent

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