US PATENT SUBCLASS 359 / 445
.~ Acoustical

Current as of: June, 1999
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359 /   HD   OPTICS: SYSTEMS (INCLUDING COMMUNICATION) AND ELEMENTS

443  DF  PROJECTION SCREEN {13}
445.~ Acoustical

DEFINITION

Classification: 359/445

Acoustical:

(under subclass 443) Subject matter wherein the screen is especially adapted to transmit or damp sound waves.

SEE OR SEARCH THIS CLASS, SUBCLASS:

444, for acoustical screens combined with means to produce sound.

SEE OR SEARCH CLASS

181, Acoustics,

175+, for mufflers and sound filters.