A. Ahlstrom Osakeyhtio

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
 
 
D21C PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR1511
 
 
 
B01D SEPARATION 4128
 
 
 
D21F PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON228
 
 
 
B01F MIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING 135
 
 
 
D21D TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE 17

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
7229527 Method for the controlled thickening of low consistency fiber suspensionsOct 22, 03Jun 12, 07[D21C]
6776876 Method of treating cellulosic pulp to remove hexenuronic acidSep 08, 97Aug 17, 04[D21C]
6767432 Apparatus for the thickening of fiber suspensionsMar 21, 01Jul 27, 04[D21C]
6730193 Wire pitFeb 15, 02May 04, 04[D21F]
6659636 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]
6605184 Method and apparatus for treatment of fiber suspension containing minerals, such as coated broke, in paper productionOct 05, 00Aug 12, 03[D21F, D21D, D21C]
6579411 Bleaching medium consistency pulp with ozoneJun 05, 95Jun 17, 03[D21C]
6547923 Process for bleaching medium consistency pulp with ozone using a pressurized fluidizing mixerJun 05, 95Apr 15, 03[D21C]
6514380 Treatment of chemical pulpMar 26, 98Feb 04, 03[D21C]

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6736934 Method of pretreating pulp in an acid tower prior to bleaching with peroxideExpiredJul 28, 97May 18, 04[D21C]
6733625 Method and apparatus for treating pulpExpiredMay 15, 01May 11, 04[D21C]
6733629 Method of controlling the operation of an approach system of a paper machine or the like web formation apparatusExpiredFeb 15, 02May 11, 04[D21D]
6582601 Method and apparatus for separating soapExpiredJan 18, 00Jun 24, 03[B01D]
6578529 Arrangement for feeding black liquor into a recovery boilerExpiredOct 17, 01Jun 17, 03[F28H]
6491787 Method for heating pulpsExpiredMar 28, 00Dec 10, 02[D21C]
6418637 Method of sealing a rotary drum connectionExpiredJul 06, 99Jul 16, 02[F26B]
2002/0088,571 Method and apparatus for treating pulpABANMay 21, 01Jul 11, 02[D21C]
2002/0056,533 METHOD OF TREATING CHEMICAL CELLULOSE PULPABANMar 05, 99May 16, 02[D21C]
6375797 Bleaching chemical pulp in a PkDQ-Po SequenceExpiredMay 22, 98Apr 23, 02[D21C]
6358363 Method and apparatus for bleaching pulp using two fluidizing mixersExpiredApr 18, 96Mar 19, 02[D21C]
6354514 Method and apparatus for treating material having poor thermal conductivityExpiredJun 14, 00Mar 12, 02[B05B]
6350348 Batch cooking with black liquor pretreatmentExpiredJul 19, 99Feb 26, 02[D21C]
6340805 Method of manufacturing a wire screen productExpiredMay 28, 98Jan 22, 02[B33K, B21F]
6193406 Method and apparatus for mixing pulp a suspension with a fluid medium with a freely rotatable mixing rotorExpiredNov 25, 98Feb 27, 01[B01F]
6165316 Method and plant for separating soap from black liquor using a pressure screenExpiredJan 12, 99Dec 26, 00[D21C]
6159338 Supply of washing liquid in a fractionating multi-stage washerExpiredMar 23, 98Dec 12, 00[D21C]
6136145 Method for treating pulp in an indirect heat exchanger in connection with bleachingExpiredDec 16, 97Oct 24, 00[D21C]
6125688 Method of determining pulp propertiesExpiredJul 06, 99Oct 03, 00[G01B, G06F, G01N]
6103128 Method and apparatus for mixing gas with liquidExpiredApr 27, 99Aug 15, 00[D21C, C02F, B03D, B01F]

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