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

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

Parallel off hook detector for electronic remote data recorder

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

Parallel phone detection circuit

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

Phone busy circuit

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

Precision FET control loop

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

Process and apparatus for control of a hands-free telephone set

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

Processes and systems for screening work orders

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

Ring trip circuit

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

Ring trip circuit for stopping call signal at different...

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

Ring trip circuit for subscriber telephone

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

Ring trip deciding circuit

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

Ring trip detection circuit

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

Ring trip detection circuit and method for subscriber line...

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

Ring trip detection in a communication system

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

Ring trip detection in telecommunications exchanges

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

Ring trip detector

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

Ring-trip circuit

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

Ringback detection circuit

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

Ringtrip judging circuit

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

Sensor circuit for telephone line