US PATENT SUBCLASS 210 / 749
.~ Chemical treatment

Current as of: June, 1999
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210 /   HD   LIQUID PURIFICATION OR SEPARATION

600  DF  PROCESSES {14}
749.~ Chemical treatment {8}
750  DF  .~.~> Including degassing
752  DF  .~.~> Plural spaced feedings
753  DF  .~.~> Utilizing halogen or halogen containing material {1}
757  DF  .~.~> By chemical reduction
758  DF  .~.~> By oxidation {4}
764  DF  .~.~> Destroying microorganisms
765  DF  .~.~> Including liquid recirculation
766  DF  .~.~> Including temperature change

DEFINITION

Classification: 210/749

Chemical treatment:

(under subclass 600) Process wherein a material is added which chemically reacts with a constituent in the liquid.

SEE OR SEARCH THIS CLASS, SUBCLASS:

606, and 631, for a chemical treatment combined with a treatment by a living organism.

634+, for a process wherein a solute is removed from a solvent by contacting a solution thereof with a second solvent which has a greater affinity for the solute than the original solvent.

660+, for a process including ion exchange.

696+, for a process wherein a chelating or sequestering agent is added in order to prevent, decrease, or delay precipitation.

702+, for a process in which a chemical is added to cause precipitation or flocculation of a constituent. SEE OR SEARCH CLASS

122, Liquid Heaters and Vaporizers,

379+, for processes and apparatus for cleaning liquid heaters or vaporizers or for purifying the water while the boiler is in operation.

137, Fluid Handling,

1+, for processes of feeding additives to a mainline flow.

208, Mineral Oils: Processes and Products,

177+, for purification of mineral oils with chemicals.

252, Compositions,

175+, for scale inhibitors.

260, Chemistry of Carbon Compounds,

701+, for chemical purification of carbon compounds.

422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing, for processes of corrosion inhibition. 424, Drug, Bio-Affecting and Body Treating Compositions, for a composition to cure or alleviate a disease and for a process involving the mere addition of a compound or composition to water, etc.; for a composition which is biocidal to an animal or a micro-organism (other than algae) or for a process involving the addition of a biocidal compound or composition with no significant or additional water treatment; or for a process of adding a chemical to water as a carrier to form a compsition with a utility of Class 424.

516, Colloid Systems and Wetting Agents; Subcombinations Thereof; Processes of Making, Stabilizing, Breaking, or Inhibiting,

113+, for compositions for or subcombination compositions for or breaking of or inhibiting of colloid systems (e.g., foam breaking, emulsion breaking, dispersion inhibiting, suspension settling, gel breaking, smoke suppressing, coagulating, flocculating) (particularly subclass 197 for breaking or resolving of emulsions in the absence of added agent by centrifuging, mechanical shocking, or specified agitating), when generically claimed or when there is no hierarchically superior provision in the USPC for the specifically claimed art. Class 516 is the locus for the breaking of colloid systems generically claimed and provides for (a) the separation or purification of liquids, generally claimed, when performed by a Class 516 process, such as by breaking an emulsion, dispersion, or foam, and for such processes further including ancillary steps, such as, decanting, or passing through a separatory funnel, etc., or (b) processes in which recovery is intended of both water and another product. Class 210 provides for (a) processes which include a step of colloid system resolution of liquids, generally claimed, when combined with a step of separation of a diverse component, unless that step is also a Class 516 step (i.e., multiple Class 516 steps are proper for placement in Class 516), or (b) a step of colloid system breaking, per se, for the purpose of obtaining water, wherein the water may be intended for use or intended to be made suitable for disposal, thus, decontaminating of sewage waste water to be dumped into the ocean using an emulsion breaking step is proper for Class 210.

588, Hazardous or Toxic Waste Destruction or Containment, appropriate subclasses for the destruction of hazardous or toxic waste by way of chemical treatment.