US PATENT SUBCLASS 400 / 690
.~.~ By sound-barrier enclosure for typewriter (e.g., by sound-absorbing material)

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

Internet Version by PATENTEC © 1999      Terms of Use


400 /   HD   TYPEWRITING MACHINES

679  DF  MEANS AUXILIARY TO TYPEWRITING FUNCTION {12}
689  DF  .~ Means for muffling typewriter noise {1}
690.~.~ By sound-barrier enclosure for typewriter (e.g., by sound-absorbing material) {3}
690.1  DF  .~.~.~> With viewing window (e.g., having reflection eliminator) {1}
690.3  DF  .~.~.~> With externally protruding operating means
690.4  DF  .~.~.~> Including means facilitating opening of enclosure

DEFINITION

Classification: 400/690

By sound-barrier enclosure for typewriter (e.g., by sound-absorbing material):

(under subclass 689) Subject matter wherein a typewriter is provided with means that substantially surrounds all or part of the typewriter mechanism, which means absorbs or baffles the noise normally produced by the typewriter during use thereof, or is provided with means that substantially soaks up the noise normally produced by a typewriter during use thereof.