LandOfFree - US Patents - Listing for Telephonic communications,Supervisory or control line signaling,Signal reception at substation

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

Device for detecting tones on telephone lines

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

Dial tone detector

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

Dial tone detector

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

Digital composite tone alerting

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

Digitally controlled ring signal generator

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

Digitally controlled ringer signal generation

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

Distinctive ringing and distinctive call-waiting tones in an ISD

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

Distinctive telephone annunciator

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

Dual signal triggered message waiting notification system for in

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

Electronic ring monitoring device for telecommunications line

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

Facsimile apparatus for outputting a melody when receiving a...

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

Facsimile apparatus for outputting a melody when receiving a...

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

Facsimile apparatus for outputting a melody when receiving a...

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

Flexible ring-tone service

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

Flickering device for telephone sets

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

Generation of consistent haptic effects

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

Integrated circuit amplifier and method of adaptive offset

Utility Patent

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

Integrated circuit for generating a melody and ring

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

Integrated ringing circuit and a ring trip circuit for the same