US PATENT SUBCLASS 134 / 28
.~.~ One an acid or an acid salt

Current as of: June, 1999
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134 /   HD   CLEANING AND LIQUID CONTACT WITH SOLIDS

*  DD  PROCESSES {23}
26  DF  .~ Using sequentially applied treating agents {4}
28.~.~ One an acid or an acid salt

DEFINITION

Classification: 134/28

(under subclass 26) Processes which include treating the work with either an acid or an acid salt.

(1) Note. Included are those having an alkaline reaction.

SEE OR SEARCH THIS CLASS, SUBCLASS:

27, for such treatments followed by a neutralizing treatment, or for the use of such treatment to neutralize a material already applied.

41, for acid treatments of metal base work, per se.