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Class Information
Number: 162/65
Name: Paper making and fiber liberation > Processes of chemical liberation, recovery or purification of natural cellulose or fibrous material > Gas, vapor or mist contact > Oxygen, ozone or air
Description: Processes in which the gas or vapor is oxygen, ozone or air.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7520958 |
Modified kraft fibers |
Apr. 21, 2009 |
| 7402224 |
Method for producing paper pulp, lignins, sugars and acetic acid by frantionation of lignocellulosic vegetable material in formic/acetic acid medium |
Jul. 22, 2008 |
| 7374637 |
Method of bleaching cellulose pulp with a main conduit for wash liquor and filtrate |
May. 20, 2008 |
| 7368036 |
Xylanase treatment of chemical pulp |
May. 6, 2008 |
| 7294227 |
Method and system for the treatment of pulp prior to ozone bleaching |
Nov. 13, 2007 |
| 7282115 |
Method for mitigating the interference caused by high-molecular weight-by-products in pulping processes |
Oct. 16, 2007 |
| 7267744 |
Pulp treatment and process |
Sep. 11, 2007 |
| 7214291 |
Method for the modification of cellulose fibres |
May. 8, 2007 |
| 7189306 |
Process of treating lignocellulosic material to produce bio-ethanol |
Mar. 13, 2007 |
| 7182835 |
Two-stage chlorine bleaching process with filtrate recirculation |
Feb. 27, 2007 |
| 7156952 |
Method and arrangement for oxygen delignification of cellulose pulp |
Jan. 2, 2007 |
| 7097740 |
Method and screen for screening at least two pulp mixtures |
Aug. 29, 2006 |
| 7090744 |
Process for making composition for conversion to lyocell fiber from sawdust |
Aug. 15, 2006 |
| 7083704 |
Process for making a composition for conversion to lyocell fiber from an alkaline pulp having low average degree of polymerization values |
Aug. 1, 2006 |
| 7022837 |
Cellulose ethers and method of preparing the same |
Apr. 4, 2006 |
| 7014684 |
Method for the treatment of waste gas from a cellulose plant |
Mar. 21, 2006 |
| 6946057 |
Alkaline process for the manufacturing of pulp using alkali metaborate as buffering alkali |
Sep. 20, 2005 |
| 6942754 |
Process for producing xylooligosaccharide from lignocellulose pulp |
Sep. 13, 2005 |
| 6861023 |
Process for making lyocell fiber from sawdust pulp |
Mar. 1, 2005 |
| 6841036 |
Process for the oxygen delignification of pulp in two stages with higher pressure in the second stage |
Jan. 11, 2005 |
| 6824646 |
Process for oxygen bleaching and enzyme treating lignocellulosic pulp with liquid treatment and recovery |
Nov. 30, 2004 |
| 6808596 |
System for the oxygen delignification of pulp consisting of lignocellulose-containing material |
Oct. 26, 2004 |
| 6776876 |
Method of treating cellulosic pulp to remove hexenuronic acid |
Aug. 17, 2004 |
| 6773547 |
Process for the bleaching of low consistency pulp using high partial pressure ozone |
Aug. 10, 2004 |
| 6770168 |
Process for oxygen pulping of lignocellulosic material and recorvery of pulping chemicals |
Aug. 3, 2004 |
| 6736934 |
Method of pretreating pulp in an acid tower prior to bleaching with peroxide |
May. 18, 2004 |
| 6733625 |
Method and apparatus for treating pulp |
May. 11, 2004 |
| 6706143 |
Minimizing chlorinated organics in pulp bleaching processes |
Mar. 16, 2004 |
| 6699358 |
Method for brightening chemical pulp with hydrogen peroxide using a magnesium compound in silicate solution |
Mar. 2, 2004 |
| 6679972 |
Process for the bleaching of a pulp suspension by separating calcium from lignin |
Jan. 20, 2004 |
| 6660128 |
Oxidase process for pulp |
Dec. 9, 2003 |
| 6627041 |
Method of bleaching and providing papermaking fibers with durable curl |
Sep. 30, 2003 |
| 6620292 |
Cellulose production from lignocellulosic biomass |
Sep. 16, 2003 |
| 6605181 |
Peroxide bleach sequence including an acidic bleach stage and including a wash stage |
Aug. 12, 2003 |
| 6579411 |
Bleaching medium consistency pulp with ozone |
Jun. 17, 2003 |
| 6579412 |
Process for ozone bleaching of low consistency pulp |
Jun. 17, 2003 |
| 6569284 |
Elemental-chlorine-free bleaching process having an initial Eo or Eop stage |
May. 27, 2003 |
| 6547923 |
Process for bleaching medium consistency pulp with ozone using a pressurized fluidizing mixer |
Apr. 15, 2003 |
| 6514380 |
Treatment of chemical pulp |
Feb. 4, 2003 |
| 6491788 |
Process for making lyocell fibers from alkaline pulp having low average degree of polymerization values |
Dec. 10, 2002 |
| 6458242 |
Ozone bleaching process using oxalic acid addition |
Oct. 1, 2002 |
| 6454900 |
Method for two-stage oxygen delignification of chemical pulp |
Sep. 24, 2002 |
| 6432263 |
Process for increasing the water retention capacity in fibrous webs |
Aug. 13, 2002 |
| 6432266 |
Process for bleaching chemical pulp simultaneously with chlorine dioxide, peroxide and a reaction catalyst |
Aug. 13, 2002 |
| 6419788 |
Method of treating lignocellulosic biomass to produce cellulose |
Jul. 16, 2002 |
| 6398908 |
Process for acid bleaching of lignocellulose-containing pulp with a magnesium compound |
Jun. 4, 2002 |
| 6391152 |
Process for the oxygen delignification of pulp in two stages with higher pressure in the second stage |
May. 21, 2002 |
| 6387211 |
Methods for reducing fluorescence in paper-containing samples |
May. 14, 2002 |
| 6379495 |
Process for the production of cellulose paper pulps by biodelignification of vegetative masses |
Apr. 30, 2002 |
| 6375797 |
Bleaching chemical pulp in a PkDQ-Po Sequence |
Apr. 23, 2002 |
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