US PATENT SUBCLASS 208 / 44
.~ Chemical modification of asphalt, tar, pitch or resin

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}
44.~ Chemical modification of asphalt, tar, pitch or resin

DEFINITION

Classification: 208/44

(under subclass 39) Processes including a chemical modification of an already formed asphalt, tar, pitch or resin.

(1) Note. Many of the processes classified herein result in a modification of the properties such as hardness, ductility, softening point, etc., of the asphalt, tar, pitch or resin treated.

SEE OR SEARCH THIS CLASS, SUBCLASS:

4+, for oxidation of asphalts, tars, or pitches.