US PATENT SUBCLASS 335 / 78
.~ Polarity-responsive

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

2  DF  ELECTROMAGNETICALLY ACTUATED SWITCHES {30}
78.~ Polarity-responsive {5}
79  DF  .~.~> Storage or memory type (e.g., bistable)
80  DF  .~.~> Armature structure {2}
83  DF  .~.~> Contact structure of composition
84  DF  .~.~> Magnetic structure (e.g., saturable) {1}
86  DF  .~.~> With adjusting means

DEFINITION

Classification: 335/78

(under subclass 2) Subject matter wherein the structure comprises circuit connection devices in which the movement of an armature depends upon the direction of the voltage or current flowing in the circuit controlling the armature. Usually the devices comprise an operating magnet associated with a permanent magnet or a constantly-energized electromagnet.

SEE OR SEARCH THIS CLASS, SUBCLASS:

179, for electromagnetic actuated switches employing a permanent magnet in addition to an electromagnet.

222, for relatively movable coil and permanent magnet.

229+, for magnets and electromagnets with armature utilizing permanent magnets, especially subclasses 230+ for the polarized type.

SEE OR SEARCH CLASS

178, Telegraphy, 93, for polarized code receivers and subclasses 101+ for telegraph keys involving a polarized relay.

310, Electrical Generator or Motor Structure,

152+, for the structure of rotary dynamo-electric machines

with permanent magnets.

318, Electricity: Motive Power Systems,

555+, for three or more position motor controlled systems which may be electromagnetically actuated and may employ polarized relays.

361, Electricity: Electrical Systems and Devices,

76, for protective systems with phase sequence analyzer; subclass 77 for protective systems responsive to reverse phase; subclasses 78+ for protective systems of the reverse energy or reverse current type; and subclass 208 for electrical control circuits for polarized relays and electromagnets.