US PATENT SUBCLASS 219 / 69.14
.~.~.~ Dielectric composition and purification

Current as of: June, 1999
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219 /   HD   ELECTRIC HEATING

50  DF  METAL HEATING (E.G., RESISTANCE HEATING) {19}
68  DF  .~ Cutting or disintegrating (e.g., machining engraving) {2}
69.11  DF  .~.~ Electric spark machining {10}
69.14.~.~.~ Dielectric composition and purification

DEFINITION

Classification: 219/69.14

Dielectric composition and purification:

(under subclass 69.11) Subject matter involving a dielectric medium between a workpiece and an electrode and any reuse or purification of the dielectric medium.

(1) Note. The dielectric medium may be a gas or a liquid.

(2) Note. The medium under this definition does not include electrolyte.

SEE OR SEARCH CLASS

210, Liquid Purification or Separation, appropriate subclasses for liquid purification in general.