KVAERNER PULPING TECHNOLOGIES AB

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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 THEREFOR1712
 
  
 
B01D SEPARATION 4130
 
  
 
D21D TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE 36
 
  
 
D06B TREATING TEXTILE MATERIALS BY LIQUIDS, GASES, OR VAPOURS 211
 
  
 
A61K PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES 1254
 
  
 
B01F MIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING 141
 
  
 
C02F TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE 154
 
  
 
F01D NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES 164
 
  
 
F04D NON-POSITIVE-DISPLACEMENT PUMPS173
 
  
 
F23G CREMATION FURNACES; CONSUMING WASTE BY COMBUSTION111

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
6325891 Method of bleaching pulp without using chlorine chemicals in a (QP)Z bleaching sequenceNov 20, 95Dec 04, 01[D21C]
5944950 Process for the final evaporation of black liquorJun 27, 97Aug 31, 99[B01D, D21C]
5914130 Potassium and sodium bicarbonate for increased blood buffersNov 20, 95Jun 22, 99[A61K]
5876560 Method and apparatus for removing gas from a fibre-liquid suspensionFeb 09, 96Mar 02, 99[D21D, C02F]
5858170 Method for pressurized peroxide bleachingJan 25, 95Jan 12, 99[D21C]
5746886 Method for the recovery of energy and chemicals from cellulose spent liquor containing potassium using a gasifierJul 14, 95May 05, 98[D21C]
5705031 Process for removing and washing dregs from green liquor in a kraft pulp millJun 15, 94Jan 06, 98[D21C]
5679217 Method and apparatus for optimizing the liquor-to-wood ratio during the production of paper pulpFeb 03, 95Oct 21, 97[D21C]
D382881 Pump impellerMar 05, 96Aug 26, 97[1502]
5644996 Method and arrangement for reburning lime sludge in a fluidizing bedSep 07, 95Jul 08, 97[F23G]

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6315862 Process for bleaching pulp with adsorption of metalsExpiredMar 15, 95Nov 13, 01[D21C]
5900123 Device for distributing liquid, especially washing liquid, for washing paper pulpExpiredFeb 09, 96May 04, 99[D21H]
5868805 Process for integrated evaporation and gasification of spent liquor from cellulose cookingExpiredMay 17, 96Feb 09, 99[C01B, B01D]
5827401 Screen system for a continuous digesterExpiredJan 16, 97Oct 27, 98[D21C]
5744005 Self-supporting straining device for a continuous digesterExpiredAug 14, 95Apr 28, 98[D21C]
5711852 Method and device for mixing of a fluid into a pulp-suspensionExpiredApr 01, 96Jan 27, 98[D21C]
5698079 Arrangement for spreading paper pulp in a containerExpiredJan 29, 96Dec 16, 97[D21C]
5685342 Apparatus for mixing a first fluid into a second fluidExpiredMay 12, 95Nov 11, 97[F16K]
5681453 Reciprocal movable screens in a vertically elongated vesselExpiredSep 13, 95Oct 28, 97[B01D]
5658428 Method for impregnation in a single-vessel hydraulic digesterExpiredOct 19, 95Aug 19, 97[D21C]
5655390 Suspension-treating deviceExpiredOct 19, 95Aug 12, 97[D06B]
5507141 Process for recovering energy from a combustible gasExpiredNov 29, 94Apr 16, 96[F02C]
5415734 Process for bleaching pulp without using chlorine containing chemicalsExpiredMay 11, 93May 16, 95[D21C]
5152871 Method for decreasing energy consumption during refining of fiber material while maintaining capacityExpiredJan 29, 91Oct 06, 92[D21B]
5085735 Method of refining cellulosic fibrous material with successive expansions before impacts, and expansions, to achieve increased fiber flexibilityExpiredAug 23, 90Feb 04, 92[D21B, B02C]
5080755 Process for the continuous digestion of cellulosic fiber materialExpiredOct 12, 89Jan 14, 92[D21C]
5074995 Apparatus for separating particles from a pulp flow and dividing the flow into fractionsExpiredOct 15, 90Dec 24, 91[B07B]
5069752 Digester screen switchingExpiredApr 30, 90Dec 03, 91[D21K]
5053108 High sulfidity cook for paper pulp using black liquor sulfonization of steamed chipsExpiredJun 28, 89Oct 01, 91[D21C]
5050380 Means for receiving and subsequently emptying hydraulic fluid from a hydraulic systemExpiredAug 20, 90Sep 24, 91[F16D]

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