US PATENT SUBCLASS 208 / 42
.~.~ Tar feed
Current as of:
June, 1999
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208 /
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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.