LandOfFree - US Patents - Listing for Telephonic communications

Telephonic communications – Emergency or alarm communications – Responsive to sensed nonsystem condition

Data transmission apparatus for use with a security system havin

Telephonic communications – Supervisory or control line signaling – Substation originated

Data transmission apparatus having abbreviated dialing function

Telephonic communications – Telephone line or system combined with diverse electrical... – To produce visual-graphic copy

Data transmission arrangement

Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network

Data transmission method and apparatus of mobile radiocommunicat

Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network

Data transmission method and unit

Telephonic communications – Telephone line or system combined with diverse electrical... – To produce visual-graphic copy

Data transmission over a communication line

Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...

Data transmission over an in-use transmission medium

Telephonic communications – Telephone line or system combined with diverse electrical... – Credit authorization

Data transmission over the public switched network

Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...

Data transmission processing machine

Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...

Data transmission system

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage

Data transmission system and method having improved alarm inhibi

Telephonic communications – Multi-line or key substation system with selective switching... – Switching or supervision feature

Data transmission system of key telephone system

Telephonic communications – Multi-line or key substation system with selective switching... – Switching or supervision feature

Data transmission system of key telephone system

Telephonic communications – Plural exchange network or interconnection – Interexchange signalling

Data transmission via a public switched telephone network

Telephonic communications – Subscriber line or transmission line interface – Network interface device

Data transmitter-receiver having echo canceler with data delay

Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...

Data transmitting/receiving apparatus and data communication sys

Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...

Data transmitting/receiving apparatus and data communication sys

Telephonic communications – Telephone line or system combined with diverse electrical...

Data-only telephone service

Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...

Data/facsimile telephone subset apparatus incorporating electrop