US PATENT SUBCLASS 361 / 297
.~.~.~.~ Spiral or helical plates

Current as of: June, 1999
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361 /   HD   ELECTRICITY: ELECTRICAL SYSTEMS AND DEVICES

271  DF  ELECTROSTATIC CAPACITORS {4}
277  DF  .~ Variable {4}
287  DF  .~.~ Mechanically variable {5}
292  DF  .~.~.~ By varying effective area of electrode {6}
297.~.~.~.~ Spiral or helical plates

DEFINITION

Classification: 361/297

Spiral or helical plates:

(under subclass 292) Subject matter in which the electrode plates are made in the forms or helixes or spirals which variably interleaf.