US PATENT SUBCLASS 381 / 311
.~.~.~ Wireless or for use in diverse

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


381 /   HD   ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES

1  DF  BINAURAL AND STEREOPHONIC {8}
300  DF  .~ Stereo speaker arrangement {7}
309  DF  .~.~ Stereo earphone {2}
311.~.~.~ Wireless or for use in diverse

DEFINITION

Classification: 381/311

Wireless or for use in diverse environment:

(under subclass 309) Subject matter in which a) audio signals are conveyed to the earphone without the use of conductors, such as by modulated RF or infrared carrier wave or b) the earphone is especially configured or adapted to be used in an unusual location, such as underwater or within a magnetic field such as Magnetic Resonance Imaging (MRI), etc.

SEE OR SEARCH CLASS

359, Optics: Systems and Elements

109+, for modulated wireless optical communications.

455, Telecommunications for modulated wireless communications, generally.