US PATENT SUBCLASS 381 / 384-- .~.~.~ Electrical hardware feature

US PATENT SUBCLASS 381 / 384
.~.~.~ Electrical hardware feature

Current as of: June, 1999
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381 /	HD	ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES

150	DF	ELECTRO-ACOUSTIC AUDIO TRANSDUCER {18}
182	DF	.~ Plural or compound reproducers {4}
370	DF	.~.~ Headphone {3}
384		.~.~.~ Electrical hardware feature

DEFINITION

Classification: 381/384

Electrical hardware feature:

(under subclass 370) Subject matter with particular connections or connectors, such as jack, plug, terminals, cord details, etc.

(1) Note. Headphones in combination with electrical circuitry such as amplifiers, filters, and so on are generally classified elsewhere.

SEE OR SEARCH THIS CLASS, SUBCLASS:

74, for headphone circuits.

309+, for stero earphones with circuitry.

394, for electrical hardware in mounting or support feature of housed loudspeaker.