US PATENT SUBCLASS 162 / 29
.~ With regeneration, reclamation, reuse, recycling or destruction of digestion fluid

Current as of: June, 1999
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162 /   HD   PAPER MAKING AND FIBER LIBERATION

1  DF  PROCESSES OF CHEMICAL LIBERATION, RECOVERY OR PURIFICATION OF NATURAL CELLULOSE OR FIBROUS MATERIAL {33}
29.~ With regeneration, reclamation, reuse, recycling or destruction of digestion fluid {3}
30.1  DF  .~.~> With destruction of organic ingredient in or smelting of liquor {7}
37  DF  .~.~> Digestion fluid reused on different fibrous materials {2}
41  DF  .~.~> Recirculation (includes separation from fibers) {2}

DEFINITION

Classification: 162/29

(under subclass 1) Processes involving (1) the regeneration, reclamation, reuse or recycling (to a fiber treating zone), or (2) the destruction of the digestion or treating fluid or chemicals after being used at least once for treating a fibrous material.

(1) Note. This and indented subclasses include processes within the scope of the above when combined with a fiber treatment step or such processes not so combined with fiber treatment which are not provided for elsewhere. The preparation of cellulose liberation agents from such waste liquors is found in this or indented subclass.

SEE OR SEARCH THIS CLASS, SUBCLASS:

52, for processes for chemically treating fibrous material in which waste liquor from the digestion is employed solely for the purpose of charging or discharging the fibrous material to or from the treating zone.

60, for processes of chemically treating fibrous material in which the waste liquor is employed for washing a fibrous pulp.

239+, for the combination of a digester and means for recovering waste liquor discharged therefrom. SEE OR SEARCH CLASS

204, Chemistry: Electrical and Wave Energy, appropriate subclass for processes of regenerating or treating waste cellulose liberation liquor electrolytically.

422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing, appropriate subclasses for apparatus for regenerating, reclaiming, or destroying used digestion agents.

423, Chemistry of Inorganic Compounds, appropriate subclasses, for the preparation or recovery of inorganic compounds, not combined with a fiber treating or liberating step and for the line between the classes see the note to Class 162 in the definition of Class 423, section III, Line and Search Notes.

435, Chemistry: Molecular Biology and Microbiology,

262, for processes for the recovery of chemicals from used cellulose digestion agents involving fermentation and not combined with fiber treatment steps.

530, Chemistry: Natural Resins or Derivatives; Peptides or Proteins; Lignins or Reaction Products Thereof,

205+, and 500+, for the recovery of organic compound from waste fiber treating agents, not combined with fiber treating steps.

588, Hazardous or Toxic Waste Destruction or Containment, appropriate subclasses for destruction of hazardous digestion or treating fluid chemicals.