US PATENT SUBCLASS 250 / 293
.~.~ Alternating field ion selecting means


Current as of: June, 1999
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250 /   HD   RADIANT ENERGY

281  DF  IONIC SEPARATION OR ANALYSIS {7}
290  DF  .~ Cyclically varying ion selecting field means {3}
293.~.~ Alternating field ion selecting means


DEFINITION

Classification: 250/293

(under subclass 290) Subject matter wherein the ion selecting means includes a polarized field whose direction of polarization changes cyclically.

(1) Note. Means producing selecting fields which vary in magnitude cyclically but not in direction are not classified in this subclass, but in 290 above. The field means classified here tend to produce oscillations of the ions rather than intermittent unidirectional accelerations.