US PATENT SUBCLASS 208 / 43
.~.~.~ By contact with hot gases

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


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  DF  .~.~ Tar feed {1}
43.~.~.~ By contact with hot gases

DEFINITION

Classification: 208/43

(under subclass 42) Processes wherein the tar is contacted by high temperature gas during distillation.

(1) Note. This subclass includes, for example, those processes of distilling tars wherein hot gases from another

part of the process may be used to facilitate the distillation process.