US PATENT SUBCLASS 252 / 79.2
.~ Inorganic acid containing

Current as of: June, 1999
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252 /   HD   COMPOSITIONS

79.1  DF  ETCHING OR BRIGHTENING COMPOSITIONS {2}
79.2.~ Inorganic acid containing {2}
79.3  DF  .~.~> Fluorine compound containing
79.4  DF  .~.~> With organic material

DEFINITION

Classification: 252/79.2

(under subclass 79.1) Compositions containing an inorganic acid.