US PATENT SUBCLASS 208 / 259
.~.~.~ Alkali or alkali earth metal compound (except clays)

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

177  DF  REFINING {23}
255  DF  .~ Gum or gum former removal {2}
257  DF  .~.~ With metal or metal compound {3}
259.~.~.~ Alkali or alkali earth metal compound (except clays)

DEFINITION

Classification: 208/259

(under subclass 257) Processes wherein an alkali or alkaline earth metal compound is employed.

(1) Note. The "alkali metals" are lithium, sodium, potassium, rubidium, cesium and francium, and "alkaline earth metals" are calcium, barium, strontium and also includes magnesium.

(2) Note. Natural clays which generally contain some alkali metal component are not included in this subclass but are classified with the aluminum or silicon compounds.

SEE OR SEARCH THIS CLASS, SUBCLASS:

260+, for processes of removing gums or gum formers wherein natural clays or alumina are used as the treating agents.

283+, for general refining processes wherein alkali or alkaline earth metal compounds are used as the treating agents.