US PATENT SUBCLASS 310 / 221
.~.~.~.~ Arc extinguishers


Current as of: June, 1999
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310 /   HD   ELECTRICAL GENERATOR OR MOTOR STRUCTURE

10  DF  DYNAMOELECTRIC {5}
40 R  DF  .~ Rotary {28}
219  DF  .~.~ Current collectors {7}
220  DF  .~.~.~ Spark-reduction {3}
221.~.~.~.~ Arc extinguishers


DEFINITION

Classification: 310/221

(under subclass 220) Subject matter having arc extinguishing means.

(1) Note. This subclass relates, for example, to dynamoelectric devices having means to extinguish arcs that result when the commutator flashes over.

SEE OR SEARCH CLASS

361, Electricity: Electrical Systems and Devices,

1+, for safety and protection of systems and devices, indented subclasses 2+ for arc control, subclasses 20+ for generator protective circuits, and subclasses 23+ for motor protective circuits.