H04Level 2

ELECTRIC COMMUNICATION TECHNIQUE

This class covers electrical communication systems with propagation paths employing light (optical communication), infrared, ultrasonic, sonic, or infrasonic waves.

GET/api/v1/systems/patent_cpc/nodes/H04

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H04BTRANSMISSION

H04HBROADCAST COMMUNICATION

H04JMULTIPLEX COMMUNICATION

H04KSECRET COMMUNICATION

H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION

H04MTELEPHONIC COMMUNICATION

H04NPICTORIAL COMMUNICATION, e.g. TELEVISION

H04QSELECTING

H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS

H04SSTEREOPHONIC SYSTEMS

H04TINDEXING SCHEME ASSOCIATED WITH CLASS

H04WWIRELESS COMMUNICATION NETWORKS

Cross-system equivalences0

No cross-system equivalences mapped for this node.

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