US PATENT SUBCLASS 507 / 930
.~.~ Organic contaminant is asphaltic

Current as of: June, 1999
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507 /   HD   EARTH BORING, WELL TREATING, AND OIL FIELD CHEMISTRY

927  DF  WELL CLEANING FLUID {3}
929  DF  .~ Cleaning organic contaminant {2}
930.~.~ Organic contaminant is asphaltic

DEFINITION

Classification: 507/930

Organic contaminant is asphaltic:

Subject matter under art collection 929 wherein the well cleaning fluid is for cleaning an asphaltic residue from the well.