US PATENT SUBCLASS 208 / 40
.~ By chemical conversion of oil

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}
40.~ By chemical conversion of oil

DEFINITION

Classification: 208/40

(under subclass 39) Processes wherein asphalt, tar, pitch or resin is produced by a chemical conversion of another liquid

mineral oil.

(1) Note. Many processes classified herein include conversions of mineral oils wherein the residues of which are treated to recover asphaltic components therefrom.

SEE OR SEARCH THIS CLASS, SUBCLASS:

4+, for oxidation of mineral oils to form asphalts tars or pitches.

44, for processes of chemically modifying an already formed asphalt, tar, pitch or resin.