US PATENT SUBCLASS 208 / 198
.~.~.~ Lead sulfide

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

177  DF  REFINING {23}
189  DF  .~ Sweetening {6}
197  DF  .~.~ With lead compounds {2}
198.~.~.~ Lead sulfide

DEFINITION

Classification: 208/198

(under subclass 197) Processes wherein the treating agent comprises lead sulfide.