LandOfFree - US Patents - Listing for Telephonic communications

Telephonic communications – With usage measurement – Call charge metering or monitoring

Validation gateway

Telephonic communications – With usage measurement – Call charge metering or monitoring

Validation query based on a supervisory signal

Telephonic communications – With usage measurement – Call charge metering or monitoring

Validation query based on a supervisory signal

Telephonic communications – With usage measurement – Call charge metering or monitoring

Validation query based on a supervisory signal

Telephonic communications – With usage measurement – Call charge metering or monitoring

Valuable cipher information issuing system and issuing...

Telephonic communications – Private or single line system

Vandal proof intercom system for apartment buildings

Telephonic communications – With check operated control – Fraud or interference prevention

Vandal-proof handset for a pay telephone

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Vandal-resistant communications station

Telephonic communications – Supervisory or control line signaling – Substation originated

Vandal-resistant push-button actuator

Telephonic communications – Terminal – Housing or housing component

Variable angle mechanism for desktop telephone

Telephonic communications – Substation or terminal circuitry – Sidetone control or hybrid circuit

Variable bandwidth handsfree telephone using switched capacitor

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

Variable block size adaptation algorithm for noise-robust acoust

Telephonic communications – Supervisory or control line signaling – Substation originated

Variable color display telephone

Telephonic communications – Emergency or alarm communications – Personal monitoring

Variable configuration portable telephone

Telephonic communications – Audio message storage – retrieval – or synthesis – Multilingual system or operation

Variable data compression announcement circuit

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

Variable DC feed characteristic in a subscriber line interface c

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Using portable test set

Variable geometry battery compartment for accommodating differen

Telephonic communications – With usage measurement – Call charge metering or monitoring

Variable length called number screening

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

Variable low frequency offset, differential, OOK, high-speed...