US PATENT SUBCLASS 162 / 4
.~ Waste paper or textile waste

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}
4.~ Waste paper or textile waste {4}
5  DF  .~.~> With organic agent
6  DF  .~.~> With chlorine, chlorine compounds, oxygen, ozone, or per-compounds
7  DF  .~.~> With sulfur or sulfur compound
8  DF  .~.~> With alkali metal, alkaline earth metal, or ammonium compound

DEFINITION

Classification: 162/4

(under subclass 1) Processes which include the treatment of paper or textile waste such as old newspapers, waste rags, etc.

(1) Note. Many of the processes classifiable herein are drawn to the "deinking" of news print. Many processes also include a mechanical defibration. In this subclass the chemical or solvent agent may act upon the ink, or other material associated with the waste paper or textile.

SEE OR SEARCH THIS CLASS, SUBCLASS:

191, for processes including the recovery or reuse of the "broke" or "trim", which is the waste material from a previous waterlaying step, for the production of pulp for further waterlaying, which process does not involve any repulping with a chemical or solvent agent.

SEE OR SEARCH CLASS

134, Cleaning and Liquid Contact With Solids, for processes of chemically removing coatings, such as wax, from a paper base without otherwise affecting the base, where the coating is not recovered. 208, Mineral Oils: Processes and Products,

24+, for processes of recovering wax from waxed paper which does not include the recovery of fiber or fibrous pulp.