US PATENT SUBCLASS 381 / 415
.~.~.~ Magnetic liquid

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}
412  DF  .~.~ Magnetic circuit {8}
415.~.~.~ Magnetic liquid

DEFINITION

Classification: 381/415

Magnetic liquid:

(under subclass 412) Subject matter having a colloid containing magnetic particles in a region unoccupied by solid members of the magnetic circuit, such as the air gap.