US PATENT SUBCLASS 335 / 182
.~.~.~ Magnetic fields opposing (e.g., differential)


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

2  DF  ELECTROMAGNETICALLY ACTUATED SWITCHES {30}
177  DF  .~ Plural magnets or flux sources {5}
180  DF  .~.~ With common core or single armature {2}
182.~.~.~ Magnetic fields opposing (e.g., differential)


DEFINITION

Classification: 335/182

(under subclass 180) Subject matter wherein the plurality of magnetic coils or other flux sources are wound upon a common core in such a manner or otherwise arranged so that their magnetic flux fields are opposing and whereby the armature or armatures are acted upon by a resultant flux field which may be zero or the difference between two or more fields. The devices classified here are of the type commonly known as differential type. The two or more windings are so connected that when energized together their magnetic effects neutralize each other and no effective flux is produced.

SEE OR SEARCH CLASS

246, Railway Switches and Signals,

227+, for railroad signaling switches with opposed magnets and subclasses 231+ for reciprocating actuators with opposed magnets.

340, Communications: Electrical,

870.31+, especially subclasses 870.35+, for inductor transmitters which may employ differentially wound coils with magnetic fields opposing.

361, Electricity: Electrical Systems and Devices, 160+, for electric circuits for relays and electromagnets which may utilize differentially wound coils.