US PATENT SUBCLASS 162 / 70
.~ Treatment with particular chemical

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


162 /   HD   PAPER MAKING AND FIBER LIBERATION

1  DF  PROCESSES OF CHEMICAL LIBERATION, RECOVERY OR PURIFICATION OF NATURAL CELLULOSE OR FIBROUS MATERIAL {33}
70.~ Treatment with particular chemical {9}
71  DF  .~.~> Treatment of ground-wood or sawdust
72  DF  .~.~> Organic {5}
78  DF  .~.~> Per-compound (e.g., peroxide, perborate)
79  DF  .~.~> Heavy metal or aluminum containing
80  DF  .~.~> Phosphorus, boron or silicon containing
81  DF  .~.~> Nitrogen oxide, acid, or salt thereof
82  DF  .~.~> Sulfur containing {1}
87  DF  .~.~> Chlorine containing {1}
90  DF  .~.~> Alkali metal, ammonium, alkaline earth metal or magnesium hydroxide or carbonate

DEFINITION

Classification: 162/70

(under subclass 1) Processes in which the fibrous material is treated with a particular, identified treating agent or chemical.

(1) Note. This and indented subclasses also provide for particular treating compositions or mixtures employed in the digestion or treatment. Such compositions are classified with the corresponding process.

(2) Note. Processes classified in this or indented subclasses may involve a plurality of the same or different distinct treatment steps, the particular agent used must be identified in at least one step.

SEE OR SEARCH THIS CLASS, SUBCLASS:

30.1+, for processes of preparation of fiber treating agents from smelts or residues left from waste treating agent from a previous digestion.

SEE OR SEARCH CLASS

8, Bleaching and Dyeing; Fluid Treatment and Chemical Modification of Textiles and Fibers,

115.5+, for chemical treatment or modification of dry paper.