US PATENT SUBCLASS 181 / 167
.~ Critically defined material or coating


Current as of: June, 1999
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181 /   HD   ACOUSTICS

157  DF  DIAPHRAGM {10}
167.~ Critically defined material or coating {3}
168  DF  .~.~> Metallic material
169  DF  .~.~> Fibrous material
170  DF  .~.~> Laminated type


DEFINITION

Classification: 181/167

(under subclass 157) Subject matter wherein the diaphragm is constructed of specific material or the diaphragm is covered or saturated, at least in part, with extraneous material.

SEE OR SEARCH THIS CLASS, SUBCLASS:

166, for diaphragm coatings specifically designed to dampen vibrations.