US PATENT SUBCLASS 204 / 458
.~.~.~.~ Plural rapid changes in direction of electric field (at least 1,000 times total and at more than 1/sec) (e.g., pulsed field, etc.)

Current as of: June, 1999
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204 /   HD   CHEMISTRY: ELECTRICAL AND WAVE ENERGY

*  DD  PROCESSES AND PRODUCTS {7}
450  DF  .~ Electrophoresis or electro-osmosis processes and electrolyte compositions therefor when not provided for elsewhere {14}
456  DF  .~.~ Gel electrophoresis {8}
457  DF  .~.~.~ With programmed, cylic, or time responsive control {1}
458.~.~.~.~ Plural rapid changes in direction of electric field (at least 1,000 times total and at more than 1/sec) (e.g., pulsed field, etc.)

DEFINITION

Classification: 204/458

Plural rapid changes in direction of electric field (at least 1000 times total and at more than 1/sec) (e.g., pulsed field, etc.):

(under subclass 457) Process in which the electric field changes direction more than 1000 times in rapid succession (more than one change per second), usually using more than 2 electrodes with synchronized timing of voltage spikes or peaks.