US PATENT SUBCLASS 335 / 230
.~.~.~ Polarized electromagnet

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.~.~.~ Polarized electromagnet {4}
231  DF  .~.~.~.~> Varying alternating current amplitude responsive
232  DF  .~.~.~.~> With plural armatures {1}
234  DF  .~.~.~.~> With reversible magnetic flux-type movement (e.g., bistable type)
235  DF  .~.~.~.~> With vibrating reed or spring bar-type armature

DEFINITION

Classification: 335/230

(under subclass 229) Subject matter wherein the permanent magnet is combined with the electromagnet such that the movement of the armature is responsive to the direction of current flow in the armature controlling circuit.

SEE OR SEARCH THIS CLASS, SUBCLASS:

78+, for polarity responsive electromagnetically actuated switches.

SEE OR SEARCH CLASS

361, Electricity: Electrical Systems and Devices,

208, for electric circuit for polarized relays and electromagnets.