US PATENT SUBCLASS 252 / 79.5
.~ Alkali metal hydroxide containing

Current as of: June, 1999
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252 /   HD   COMPOSITIONS

79.1  DF  ETCHING OR BRIGHTENING COMPOSITIONS {2}
79.5.~ Alkali metal hydroxide containing

DEFINITION

Classification: 252/79.5

(under subclass 79.1) Compositions which contain an alkali metal hydroxide.

(1) Note. The hydroxide may be the etching or brightening compound or may be used in addition thereto.