US PATENT SUBCLASS 588 / 238
CHALCOGEN CONTAINING SUBSTANCE DESTROYED (O, S, Se, or Te)

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

238CHALCOGEN CONTAINING SUBSTANCE DESTROYED (O, S, Se, or Te) {3}
239  DF  .~> Hydropyrolysis or destructive steam gasification
240  DF  .~> Heating or vacuum used to drive off or produce a volatile substance {1}
242  DF  .~> Reacting with chemical agents {1}

DEFINITION

Classification: 588/238

CHALCOGEN CONTAINING SUBSTANCE DESTROYED (O, S, Se, or Te):

(under the class definition) Process wherein the hazardous or toxic waste destroyed or converted into an environmentally safe substance contains a chalcogen (O, S, Se, or Te).

(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 238. Mandatory XR (cross-reference) into subclass(es) for the actual hazardous or toxic substance (component) destroyed is noted.

SEE OR SEARCH THIS CLASS, SUBCLASS:

215, for the treatment of organic substances containing chalcogen (O, S, Se, or Te) in the hazardous or toxic waste destroyed.

SEE OR SEARCH CLASS

210, Liquid Purification or Separation, appropriate subclasses for processes in general for liquid purification or separation of liquid phases. The line between Class 210 and Class 588 is that, if there is a specific statement in the claim that hazardous or toxic waste is destroyed, separated, or converted into an environmentally safe substance, the process is placed in Class 588; however, if purified liquid, e.g., water, is obtained as a desired product, place the process in Class 210.

423, Chemistry of Inorganic Compounds, appropriate subclasses for the production of the desired inorganic substance or product,

508+, for substance or products containing selenium or tellurium, subclasses 511+ for substances or products containing sulfur, and subclasses 579+ for substances or products containing oxygen.