US PATENT SUBCLASS 208 / 203
.~.~ With alkali metal hydroxide or carbonate

Current as of: June, 1999
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208 /   HD   MINERAL OILS: PROCESSES AND PRODUCTS

177  DF  REFINING {23}
189  DF  .~ Sweetening {6}
203.~.~ With alkali metal hydroxide or carbonate {2}
204  DF  .~.~.~> With added oxygen containing organic compound {1}
206  DF  .~.~.~> With added nitrogen containing compound

DEFINITION

Classification: 208/203

(under subclass 189) Processes wherein added alkali metal hydroxide or carbonate is employed.

(1) Note. For the purpose of classification in this or indented subclass the alkali metals are Li, Na, K, Rb, Cs and Fr.

(2) Note. This subclass contains, for example, sweetening processes wherein the treating agent may be sodium or

potassium hydroxide, carbonate or bicarbonate.

SEE OR SEARCH THIS CLASS, SUBCLASS:

226, for processes (nonsweetening) of removing sulfur from mineral oil using alkali metal compounds.