US PATENT SUBCLASS 204 / 158.2
.~.~ Processes of purifying materials

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

*  DD  PROCESSES AND PRODUCTS {7}
157.15  DF  .~ Processes of treating materials by wave energy {6}
158.2.~.~ Processes of purifying materials {1}
158.21  DF  .~.~.~> Organic material purified

DEFINITION

Classification: 204/158.2

Processes of purifying materials:

(under subclass 157.15) Subject matter involving processes which cause the separation or purification of materials through chemical reactions brought about by wave energy.

(1) Note. Examples of patents proper for this subclass include: (a) processes of removing phosgene impurity in BC13 by the use of laser radiation said radiation disassociating COC12 into disassociated products; (b) processes of subjecting propylene oxide containing volatile by-product chlorine-containing impurities to ionization radiation to remove said impurities; (c) processes of removing phenanthrene from crude anthracene by use of wave energy.

(2) Note. Methods of purifying a composition by wave energy so as perfect said composition for a particular art use are

classified with the appropriate art use, e.g., Class 426 if a food, etc.

SEE OR SEARCH THIS CLASS, SUBCLASS:

157.4, and 158.14, for processes of synthesizing a desired compound by the use of wave energy.

SEE OR SEARCH CLASS

423, Chemistry of Inorganic Compounds, for processes of purifying an inorganic compound or element wherein no chemical reaction induced by wave energy is involved.