US PATENT SUBCLASS 209 / 590
.~.~.~ Sonic or supersonic energy

Current as of: June, 1999
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209 /   HD   CLASSIFYING, SEPARATING, AND ASSORTING SOLIDS

509  DF  SORTING SPECIAL ITEMS, AND CERTAIN METHODS AND APPARATUS (E.G., POCKET TYPE AND LIGHT RESPONSIVE SORTING, ETC.) FOR SORTING ANY ITEMS {11}
552  DF  .~ Condition responsive means controls separating means {13}
576  DF  .~.~ Sensing radiant energy reflected, absorbed, emitted, or obstructed by item or adjunct thereof {3}
590.~.~.~ Sonic or supersonic energy

DEFINITION

Classification: 209/590

Sonic or supersonic energy:

(under subclass 576) Methods and apparatus utilizing sonic or supersonic radiation.

(1) Note. To be included here, a patent must (1) state that the radiant energy is sonic or supersonic, or (2) set out specific frequencies which are known to be sonic or supersonic, i.e., frequencies above 12-15 per second.