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

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

Internet Version by PATENTEC © 1999      Terms of Use


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.