AHLSTROM MACHINERY OY

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
B01D SEPARATION 13121
 
  
 
D21C PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR820
 
  
 
D21F PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON326
 
  
 
B03B SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS 27
 
  
 
F22D PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER; FEED-WATER SUPPLY; CONTROLLING WATER LEVEL; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN BOILERS 28
 
  
 
F27B FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS222
 
  
 
B04C APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES 112
 
  
 
B07B SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, OR SIFTING OR BY USING GAS CURRENTS; OTHER SEPARATING BY DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL 120
 
  
 
C01B NON-METALLIC ELEMENTS; COMPOUNDS THEREOF178
 
  
 
C02F TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE 154

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
6776876 Method of treating cellulosic pulp to remove hexenuronic acidSep 08, 97Aug 17, 04[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]
6306253 Acid treatment of pulp at high temperature prior to chlorine dioxide bleachingApr 14, 98Oct 23, 01[D21C]
6146604 Method of removing nitrogen oxides from recovery boiler flue gasesMay 11, 99Nov 14, 00[C01B, D21C]
6119867 Screen cylinderMay 28, 98Sep 19, 00[B07B, B01D]
6096120 Deaeration vesselMay 26, 98Aug 01, 00[D21D, B01D]
6090240 Method of inhibiting scaling in black liquor evaporatorsFeb 20, 98Jul 18, 00[C02F, B01D, D21C]
6030494 Method of treating melodorous gases of a pulp millSep 03, 98Feb 29, 00[B01D]
5996806 Method and apparatus for treating filler-containing material such as recycled fibersSep 03, 97Dec 07, 99[B03B]

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6724878 Method and system for processing a telephone callExpiredOct 11, 01Apr 20, 04[H04M]
6358363 Method and apparatus for bleaching pulp using two fluidizing mixersExpiredApr 18, 96Mar 19, 02[D21C]
2001/0006,484 Method and apparatus for mixing a second medium with a first mediumAbandonedJan 11, 01Jul 05, 01[B01F]
6193406 Method and apparatus for mixing pulp a suspension with a fluid medium with a freely rotatable mixing rotorExpiredNov 25, 98Feb 27, 01[B01F]
6086713 Method of treating pulpExpiredJan 27, 98Jul 11, 00[D21C]
6074521 Method of separating impurities from lime and lime sludgeExpiredJan 08, 98Jun 13, 00[D21C]
6024028 Protection of the air ports of a recovery boilerExpiredMar 11, 98Feb 15, 00[F23L]
5989018 Lime sludge feed arrangementExpiredJul 01, 97Nov 23, 99[F27B]
5976319 Disrupting the flow from the smelt spout of a recovery boilerExpiredNov 26, 97Nov 02, 99[D21C]
5960962 ScreenExpiredAug 17, 98Oct 05, 99[B07B]
5897788 Method and apparatus for cleaning a filter drum used for thickening lime mudExpiredNov 16, 95Apr 27, 99[B01D]
5879511 Recovery boiler operation with black liquor feed in separate liquid stream and solid streamExpiredJul 07, 97Mar 09, 99[D21C]
5837096 Falling film evaporatorExpiredJan 23, 96Nov 17, 98[F28B, F28D, F28F]
5800674 Method and apparatus for improving a batch cooking processExpiredNov 01, 96Sep 01, 98[D21C]
5788813 Clarifying and/or filtering of green liquor and an apparatus thereforeExpiredSep 11, 96Aug 04, 98[D21C]
5766414 Method of bleaching cellulose pulp with peroxide under elevated pressure in a first vessel and atmospheric pressure in second vesselExpiredFeb 16, 96Jun 16, 98[D21C]
5716496 Method and apparatus for treatment of black liquorExpiredJul 10, 95Feb 10, 98[B01D]
5707490 Method of recovering energy from waste liquors from pulp processesExpiredApr 18, 96Jan 13, 98[D21C]
5699746 Method and apparatus for feeding air into a furnaceExpiredApr 04, 96Dec 23, 97[F23L]
5683550 Method and apparatus for increasing recovery boiler capacity by withdrawing combustible gas from the furnaceExpiredFeb 05, 96Nov 04, 97[F23G, D21C]

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