US PATENT SUBCLASS 588 / 256
.~.~ Waste contains heavy metal (e.g., fly, ash, flue dust, and incinerator ash)

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

249  DF  CONTAINMENT {6}
252  DF  .~ Solidification, vitrification, or cementation {4}
256.~.~ Waste contains heavy metal (e.g., fly, ash, flue dust, and incinerator ash) {1}
257  DF  .~.~.~> And confined in a cement type material (e.g., concrete)

DEFINITION

Classification: 588/256

Waste contains heavy metals (e.g., fly ash, flue dust, and incinerator ash):

(under subclass 252) Processes wherein hazardous or toxic waste contains heavy metals.

(1) Note. It is assumed that fly ash, flue dust, and incinerator ash obtained from various sources will contain at least traces of some heavy metal in the absence of disclosure to the contrary.

SEE OR SEARCH CLASS

106, Compositions: Coating or Plastic,

286.1+, for inorganic materials only containing at least one metal atom and subclass 287.18 for coating or plastic compositions containing heavy metals.

501, Compositions: Ceramic,

155, for ceramic compositions composed of waste material.