US PATENT SUBCLASS 422 / 14
.~.~ Essentially pure water environment

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}
14.~.~ Essentially pure water environment {5}
15  DF  .~.~.~> Using organic compound having phosphorus
16  DF  .~.~.~> Using organic nitrogen compound other than ammonium salt
17  DF  .~.~.~> Using organic carboxylic acid or salt thereof
18  DF  .~.~.~> Using inorganic silicon or phosphorus compound
19  DF  .~.~.~> Using heavy metal or compound thereof

DEFINITION

Classification: 422/14

Essentially pure water environment:

(under subclass 7) Process for preventing damage to metal by an environment which is essentially liquid water.

(1) Note. "Essentially pure water" is defined as water of at least industrial purity, containing no significant intentional additive intended to perfect it for an art use not possessed by water, per se. It is recognized that industrial water contains many incidental impurities and even though the nature and amount are specifically stated, the presence of these substances will not prevent classification here hereunder, nor will impurities which build up in a water system during use; e.g., boiler, etc. The following are considered essentially pure water: carbonic acid solutions which are the mere result of operating in ambient air; boiler water and cooling water even if they contain small amounts of other intentional perfecting additives; e.g., biocides, etc. Sea water is not considered essentially pure.