US PATENT SUBCLASS 379 / 56.1
HAVING LIGHT WAVE OR ULTRASONIC LINK FOR SPEECH OR PAGING SIGNAL

Current as of: June, 1999
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379 /   HD   TELEPHONIC COMMUNICATIONS

56.1HAVING LIGHT WAVE OR ULTRASONIC LINK FOR SPEECH OR PAGING SIGNAL {2}
56.2  DF  .~> Including fiber optic link within telephone network
56.3  DF  .~> Including infra-red link with landline telephone network

DEFINITION

Classification: 379/56.1

HAVING LIGHT WAVE OR ULTRASONIC LINK FOR SPEECH OR PAGING SIGNAL:

(under the class definition) Subject matter wherein a telephone circuit connection is made by a transmitted electromagnetic wave group capable of propagating at the velocity of light (about 186,281 miles per second), or which has sonic vibrations above that of audible sound (16,000 Hz).

(1) Note. For classification herein there must be some

connection to a telephone landline, for example, where a connection is made through a telephone operator or exchange.

(2) Note. Optical telephones are classified herein. For subcombinations involving optical communication see the search notes below.

SEE OR SEARCH CLASS

340, Communications: Electrical,

311.1, for a generic paging arrangement.

359, Optics: Systems (Including Communication) and Elements, 109+, for systems and subsystems using an optical carrier.

385, Optical Waveguides, appropriate subclasses for optical conducting elements, per se.