US PATENT SUBCLASS 208 / 42
.~.~ Tar feed


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}
41  DF  .~ By distillation {1}
42.~.~ Tar feed {1}
43  DF  .~.~.~> By contact with hot gases


DEFINITION

Classification: 208/42

(under subclass 41) Processes wherein material distilled is a tar.