US PATENT SUBCLASS 335 / 234
.~.~.~.~ With reversible magnetic flux-type movement (e.g., bistable type)

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}
234.~.~.~.~ With reversible magnetic flux-type movement (e.g., bistable type)

DEFINITION

Classification: 335/234

(under subclass 230) Subject matter wherein the electromagnet is energized by direct current signal, the polarity of which determines the direction of flux flow and consequently the movement of the armature.

(1) Note. This subclass provides for polarized electromagnets wherein a permanent magnet holds the armature in one position until the electromagnet is energized with a direct current signal of the proper polarity to produce a flux flow to overcome the attraction of the permanent magnet.

(2) Note. This subclass also provides for polarized electromagnets wherein the armature normally is in a balanced state and is moved in one direction or the other responsive to the polarity of the direct current signal applied to the electromagnet.

SEE OR SEARCH THIS CLASS, SUBCLASS:

78+, for polarity responsive electromagnetically actuated switches.

231, for polarized electromagnets responsive to varying alternating current amplitude.

SEE OR SEARCH CLASS 307, Electrical Transmission or Interconnection Systems, for polarity responsive switching systems.

361, Electricity: Electrical Systems and Devices,

77, for reverse phase responsive protective systems, subclasses 78+ for reverse energy or current, and subclass 208 for polarized electromagnets with circuits.