US PATENT SUBCLASS 44 / 311
.~ Sludge, pitch, tar, or tar distillate containing

Current as of: June, 1999
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44 /   HD   FUEL AND RELATED COMPOSITIONS

300  DF  LIQUID FUELS (EXCLUDING FUELS THAT ARE EXCLUSIVELY MIXTURES OF LIQUID HYDROCARBONS) {31}
311.~ Sludge, pitch, tar, or tar distillate containing

DEFINITION

Classification: 44/311

Sludge, pitch, tar, or tar distillate containing:

(under subclass 300) Compositions which contain tar, tar distillate, pitch, or sludge.

(1) Note. Pitch, tar, and tar distillate are generally considered as mineral oils.

SEE OR SEARCH CLASS

208, Mineral Oils: Processes and Products, especially

15+, for liquid fuel compositions which are mixtures of mineral oil materials only.