US PATENT SUBCLASS 336 / 145
.~ Plural coils (e.g., transformers)

Current as of: June, 1999
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336 /   HD   INDUCTOR DEVICES

137  DF  WITH MEANS TO CHANGE COIL LENGTH OR CONNECTIONS {8}
145.~ Plural coils (e.g., transformers) {3}
146  DF  .~.~> Inductance change in plural coils
147  DF  .~.~> Plural coils or coil portions connected in parallel or in series and parallel
148  DF  .~.~> Autotransformers

DEFINITION

Classification: 336/145

(under subclass 137) Subject matter wherein the inductor device is provided with a plurality of coils in mutually inductive relation.

(1) Note. See the Notes to the class definition for the other classes which provide for plural coil inductive reactors and transformers.

SEE OR SEARCH THIS CLASS, SUBCLASS:

116, where the coils are also movable relative to each other.

138, where the coils are spaced in parallel relationship and a movable contactor contacts both coils to include an equivalent portion of both coils in circuit.

170+, 182+, 188, and 220, for the structure of nonadjustable inductive devices having plural windings (e.g., transformers). SEE OR SEARCH CLASS

330, Amplifiers,

169, for amplifiers having transformer coupling including means to adjust the inductive coupling.