US PATENT SUBCLASS 588 / 231
HEAVY METAL CONTAINING SUBSTANCE DESTROYED

Current as of: June, 1999
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588 /   HD   HAZARDOUS OR TOXIC WASTE DESTRUCTION OR CONTAINMENT

231HEAVY METAL CONTAINING SUBSTANCE DESTROYED {4}
232  DF  .~> Magnetic separation
233  DF  .~> Hydropyrolysis or destructive steam gasification
234  DF  .~> Heating or vacuum used to drive off or produce a volatile substance {1}
236  DF  .~> Reacting with chemical agents {1}

DEFINITION

Classification: 588/231

HEAVY METAL CONTAINING SUBSTANCE DESTROYED:

(under the class definition) Process wherein the hazardous or toxic waste destroyed or converted into an environmentally safe substance contains a heavy metal.

(1) Note. The substance(s) that is destroyed maybe a mixture of hazardous or toxic waste with nonhazardous or nontoxic waste. Either component of the mixture being destroyed is sufficient for classification in subclass 231. Mandatory XR (cross-reference) into subclass(es) for the actual hazardous or toxic substance (component) destroyed is noted.

SEE OR SEARCH CLASS

75, Specialized Metallurgical Processes, Compositions for Use Therein, Consolidated Metal Powder Compositions, and Loose Metal Particulate Mixtures,

414, 709 for the production of free metal using a process which takes place at above 300 deg. C and subclasses 710-745 for the production of free metal employing temperatures below 300 deg. C.

423, Chemistry of Inorganic Compounds,

1, 154 for treating a mixture to obtain a desired metal containing compound.