US PATENT SUBCLASS 335 / 231
.~.~.~.~ Varying alternating current amplitude responsive

Current as of: June, 1999
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335 /   HD   ELECTRICITY: MAGNETICALLY OPERATED SWITCHES, MAGNETS, AND ELECTROMAGNETS

209  DF  MAGNETS AND ELECTROMAGNETS {10}
220  DF  .~ With magneto-mechanical motive device (e.g., electromagnet with armature) {21}
229  DF  .~.~ With permanent magnet {1}
230  DF  .~.~.~ Polarized electromagnet {4}
231.~.~.~.~ Varying alternating current amplitude responsive

DEFINITION

Classification: 335/231

(under subclass 230) Subject matter wherein the armature or mechanical means which is adapted to be moved by the polarized electromagnet, is of a type movable to varying positions between two extreme positions, responsive to the intensity of the alternating current energizing signal.

(1) Note. This subclass includes polarized electromagnets having armatures of the type that are used for loudspeakers.

SEE OR SEARCH THIS CLASS, SUBCLASS:

99+, for alternating current type switches.

222, for relatively movable coil and permanent magnet.

243+, for alternating current type electromagnets.

SEE OR SEARCH CLASS 361, Electricity: Electrical Systems and Devices,

143+, for electric circuit for alternating current relay or electromagnet.

369, Dynamic Information Storage or Retrieval,

147, for similar subject matter utilized in phonograph disc recording tone arms.

381, Electrical Audio Signal Processing Systems and Devices,

177, and 400+.