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

Integrated ringer for short telephone lines

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

Interface circuit to quickly establish a loop current

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

Interswitch line circuit

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 – Using line or loop condition detection

Logic signal circuit for a releasing relay

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 – Using line or loop condition detection

Low resistance origination scan circuit

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

Method and apparatus for an improved ring trip detection telepho

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

Method and apparatus for automatic generation of telephone call

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

Method and apparatus for detecting multiple telephone...

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

Method and apparatus for determining when a telephone handset is

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

Method and apparatus for non-disruptive telecommunication...

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

Method and apparatus for non-disruptive telecommunication...

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

Method and apparatus for off-hook detection

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

Method and apparatus for ring again feature for a telephone...

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

Method and apparatus for sensing current