ANDRITZ-AHLSTROM OY

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Intl Class Technology # of Patents Rank
 
 
 
D21C PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR168
 
 
 
B01D SEPARATION 488
 
 
 
D21F PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON229
 
 
 
A61F FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS 1105
 
 
 
B01F MIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING 126
 
 
 
C01B NON-METALLIC ELEMENTS; COMPOUNDS THEREOF144
 
 
 
D21D TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE 15

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
7,229,527 Method for the controlled thickening of low consistency fiber suspensionsOct 22, 03Jun 12, 07[D21C]
6,776,876 Method of treating cellulosic pulp to remove hexenuronic acidSep 08, 97Aug 17, 04[D21C]
6,767,432 Apparatus for the thickening of fiber suspensionsMar 21, 01Jul 27, 04[D21C]
6,730,193 Wire pitFeb 15, 02May 04, 04[D21F]
6,659,636 Method and apparatus for feeding a chemical into a liquid flowAug 24, 00Dec 09, 03[B01F]
RE38317 Method and apparatus for treating filler-containing material, such as recycled fibersJun 06, 00Nov 18, 03[D21C]
6,605,184 Method and apparatus for treatment of fiber suspension containing minerals, such as coated broke, in paper productionOct 05, 00Aug 12, 03[D21F, D21D, D21C]
6,579,411 Bleaching medium consistency pulp with ozoneJun 05, 95Jun 17, 03[D21C]
6,547,923 Process for bleaching medium consistency pulp with ozone using a pressurized fluidizing mixerJun 05, 95Apr 15, 03[D21C]
6,514,380 Treatment of chemical pulpMar 26, 98Feb 04, 03[D21C]

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Expired/Abandoned/Withdrawn Patents

Patent # Title Filing Date Issue/Pub Date Intl Class
6,736,934 Method of pretreating pulp in an acid tower prior to bleaching with peroxideJul 28, 97May 18, 04[D21C]
6,733,625 Method and apparatus for treating pulpMay 15, 01May 11, 04[D21C]
6,733,629 Method of controlling the operation of an approach system of a paper machine or the like web formation apparatusFeb 15, 02May 11, 04[D21D]
6,582,601 Method and apparatus for separating soapJan 18, 00Jun 24, 03[B01D]
6,578,529 Arrangement for feeding black liquor into a recovery boilerOct 17, 01Jun 17, 03[F28H]
6,491,787 Method for heating pulpsMar 28, 00Dec 10, 02[D21C]
6,418,637 Method of sealing a rotary drum connectionJul 06, 99Jul 16, 02[F26B]
2002/0088,571 Method and apparatus for treating pulpMay 21, 01Jul 11, 02[D21C]
2002/0056,533 METHOD OF TREATING CHEMICAL CELLULOSE PULPMar 05, 99May 16, 02[D21C]
6,375,797 Bleaching chemical pulp in a PkDQ-Po SequenceMay 22, 98Apr 23, 02[D21C]
6,358,363 Method and apparatus for bleaching pulp using two fluidizing mixersApr 18, 96Mar 19, 02[D21C]
6,354,514 Method and apparatus for treating material having poor thermal conductivityJun 14, 00Mar 12, 02[B05B]
6,350,348 Batch cooking with black liquor pretreatmentJul 19, 99Feb 26, 02[D21C]
6,340,805 Method of manufacturing a wire screen productMay 28, 98Jan 22, 02[B33K, B21F]
6,193,406 Method and apparatus for mixing pulp a suspension with a fluid medium with a freely rotatable mixing rotorNov 25, 98Feb 27, 01[B01F]
6,165,316 Method and plant for separating soap from black liquor using a pressure screenJan 12, 99Dec 26, 00[D21C]
6,159,338 Supply of washing liquid in a fractionating multi-stage washerMar 23, 98Dec 12, 00[D21C]
6,159,564 Core and a method of manufacturing suchSep 10, 98Dec 12, 00[D21J, B32B, B31C, B65D]
6,136,145 Method for treating pulp in an indirect heat exchanger in connection with bleachingDec 16, 97Oct 24, 00[D21C]
6,125,688 Method of determining pulp propertiesJul 06, 99Oct 03, 00[G01B, G06F, G01N]

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