US PATENT SUBCLASS 422 / 12
.~.~ Aqueous acid environment (i.e.,pH << 4.1)

Current as of: June, 1999
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422 /   HD   CHEMICAL APPARATUS AND PROCESS DISINFECTING, DEODORIZING, PRESERVING, OR STERILIZING

1  DF  PROCESS DISINFECTING, PRESERVING, DEODORIZING, OR STERILIZING {15}
7  DF  .~ Maintaining environment nondestructive to metal {5}
12.~.~ Aqueous acid environment (i.e.,pH << 4.1)

DEFINITION

Classification: 422/12

Aqueous acid environment (i.e., pH £ 4.1):

(under subclass 7) Process for preventing damage to metal caused by an environment which contains water and a protonic acid as strong as H2S or stronger (i.e., pH £ 4.1)/.

(1) Note. See subclass 13 definition for the definition of an aqueous alkaline solution as used therein.