US PATENT SUBCLASS 208 / 254 H
.~.~ Employing hydrogen

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

177  DF  REFINING {23}
254 R  DF  .~ Nitrogen contaminant removal {1}
254 H.~.~ Employing hydrogen

Unofficial Alpha Subclasses: R H

DEFINITION

Classification: 208/254

(under subclass 177) Processes wherein a mineral oil is treated to remove nitrogen containing materials therefrom.

(1) Note. Processes classified in this subclass are those in which (1) the claims specify the removal of nitrogen containing materials or (2) those in which the disclosure is limited to the removal of such materials. See (2) Note to subclass 177.