US PATENT SUBCLASS 381 / 404
.~.~.~.~ Spider

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}
396  DF  .~ Electromagnetic (e.g., dyynamic) {8}
400  DF  .~.~ Movable voice coil {8}
403  DF  .~.~.~ Centering from outside bobbin or diaphragm {1}
404.~.~.~.~ Spider

DEFINITION

Classification: 381/404

Spider:

(under subclass 403) Subject matter including a concentrically-waved membrane or sheet which readily flexes in the direction of motion of the diaphragm, but resists motion perpendicular to the diaphragm's motion, and which typically surrounds the diaphragm or bobbin in an annular manner.