US PATENT SUBCLASS 208 / 45
.~ Solvent extraction

Current as of: June, 1999
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208 /   HD   MINERAL OILS: PROCESSES AND PRODUCTS

39  DF  ASPHALTS, TARS, PITCHES AND RESINS; MAKING, TREATING AND RECOVERY {4}
45.~ Solvent extraction

DEFINITION

Classification: 208/45

(under subclass 39) Processes including a solvent extraction of the asphalt, tar, pitch, or resin.

SEE OR SEARCH THIS CLASS, SUBCLASS:

309, for treatments of mineral oils to remove asphalt therefrom which is regarded as an undesirable component thereof and no steps to recover or use the asphalt are included.