US PATENT SUBCLASS 422 / 7
.~ Maintaining environment nondestructive to metal

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.~ Maintaining environment nondestructive to metal {5}
8  DF  .~.~> Using protective article (e.g., antitarnish fabric, etc.)
9  DF  .~.~> Using gaseous preservative, preservative added to gaseous phase of environment, or maintaining gaseous phase nondestructive {2}
12  DF  .~.~> Aqueous acid environment (i.e.,pH << 4.1)
13  DF  .~.~> Aqueous alkali environment (i.e., pH >> 8.4)
14  DF  .~.~> Essentially pure water environment {5}

DEFINITION

Classification: 422/7

Maintaining environment nondestructive to metal:

(under subclass 1) Process for modifying an environment in contact with metal in a manner that damage or destruction of the metal, by other than mechanical means, is decreased or eliminated.

(1) Note. Articles or compositions and their mere method of manufacture are classified in the relevant classes even though they contain additives or features intended to prevent damage; e.g., corrosion, etc., to the metal which they come into contact with or which is part of the article. However, processes which require a continued ongoing maintenance of a condition are considered more than mere methods of manufacture and are classified hereunder.

(2) Note. Art processes combined with steps of preventing damage to metal; e.g., anticorrosion, etc., are classified with the relevant process. However, this and indented subclasses provide for nominal art processes wherein the only positive steps recited are those of preventing damage to the

metal; e.g., corrosion, etc.