LandOfFree - US Patents - Listing for Telephonic communications,Supervisory or control line signaling

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

Light controlled telephone ringer

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

Light emitting diode message waiting lamp circuit

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

Line circuit for driving a ringer and a service indicating lamp

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

Line in-use indicator for a telephone set and facsimile machine

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

Line status indicator for use with telephones sharing a single l

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

Line-powered detection of call progress tones

Telephonic communications – Supervisory or control line signaling – Substation originated

Liquid crystal display driver and power supply

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

Logic signal circuit for a releasing relay

Telephonic communications – Supervisory or control line signaling – Substation originated

Long distance telephonic access assembly and method for...

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

Loop current monitor circuitry and method for a...

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

Loudspeaking telephone with a variable gain circuit

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

Low insertion loss current sense circuit

Telephonic communications – Supervisory or control line signaling – Signal receiver

Low power signal detection

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

Low resistance origination scan circuit

Telephonic communications – Supervisory or control line signaling – Signal receiver

Low-frequency alternating current signal detector, in particular

Telephonic communications – Supervisory or control line signaling – Signal receiver

LPC-based DTMF receiver for secondary signalling