AHLSTROM MACHINERY INC.

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Technologies

Intl Class Technology # of Patents/ App Rank in Class
 
 
 
D21C PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR188
 
 
 
B01D SEPARATION 2114
 
 
 
B01F MIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING 227
 
 
 
B67D DISPENSING, DELIVERING, OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR 239
 
 
 
B65D CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES 188
 
 
 
F04B POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS 154
 
 
 
F04C ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS 135

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
6,174,411 Continuous digester with inverted top separatorNov 17, 98Jan 16, 01[D21C]
6,120,252 Gas separation control in a centrifugal pump/vacuum pumpSep 30, 98Sep 19, 00[F04B, F04C]
6,071,331 Method and apparatus for separating gas from a gaseous materialJun 01, 95Jun 06, 00[B01D]
6,024,837 Low temperature gas phase continuous digesterJan 27, 98Feb 15, 00[D21C]
5,968,314 Chip feeding for a digesterOct 21, 97Oct 19, 99[D21C]
5,882,477 Continuous digester with a low temperature gas-phaseFeb 10, 97Mar 16, 99[D21C]
5,830,314 Cleaning condensates from multi-effect evaporator of cellulose pulp waste liquorsSep 05, 95Nov 03, 98[D21C, B01D]
5,813,758 Concentric ring fluidizing mixerDec 10, 93Sep 29, 98[B01F]
5,795,438 Method and apparatus for feeding multiple digestersNov 04, 96Aug 18, 98[D21C]
5,779,856 Cooking cellulose material using high alkali concentrations and/or high pH near the end of the cookOct 24, 96Jul 14, 98[D21C]

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Expired/Abandoned/Withdrawn Patents

Patent # Title Filing Date Issue/Pub Date Intl Class
6,284,095 Minimization of malodorous gas release from a cellulose pulp mill feed systemJan 14, 00Sep 04, 01[D21C]
6,241,851 Treatment of cellulose material with additives while producing cellulose pulpFeb 10, 99Jun 05, 01[D21C]
6,199,299 Feeding of comminuted fibrous material to a pulping processApr 06, 98Mar 13, 01[F26B]
6,176,971 Heat economy enhancements for the recovery and use of energy obtained from spent cooking liquorsNov 18, 98Jan 23, 01[D21C]
6,153,300 Bleaching cellulose pulp having cleanliness which varies significantly over time using at least two different bleaching stages and bleaching chemicalsApr 18, 94Nov 28, 00[D02G]
6,143,134 Chip spreader for air-lock feederOct 22, 99Nov 07, 00[D21C]
6,123,808 Distribution of dilution liquor to the discharge of a cellulose pulp digesterDec 09, 97Sep 26, 00[D21C]
6,120,647 Simplified liquid removal system for a cellulose pulp digesterJan 26, 98Sep 19, 00[D21C]
6,106,667 Treatment of recycled bleach plant filtratesMar 31, 92Aug 22, 00[D21C]
6,024,227 Tramp material removal from pulp feed systemsAug 04, 97Feb 15, 00[B04C]
6,010,594 Method of bleaching pulp with chlorine-free chemicals wherein a complexing agent is added immediately after an ozone bleach stageSep 15, 97Jan 04, 00[D21C]
5,985,096 Vertical pulping digester having substantially constant diameterSep 23, 97Nov 16, 99[D21C]
5,882,475 Method of recovering fibers from a reject stream generated in a wastepaper treating processMar 26, 97Mar 16, 99[D21B]
5,766,418 Handling fibrous material used to produce cellulose pulpSep 13, 96Jun 16, 98[D21C]
5,701,829 Apparatus for recovering heat in a spent liquor recovery boilerApr 13, 95Dec 30, 97[F23G]
5,690,341 Method and apparatus for the facilitating the servicing of drive-shaft assemblies for pressurized vesselsJun 17, 96Nov 25, 97[F16J]
H001681 Discharge from pulping vessels without the aid of mechanical agitationSep 18, 95Oct 07, 97[D21C]
5,639,347 Method of controlling of metals in a bleach plant, using oxidationAug 31, 93Jun 17, 97[D21C]
5,635,025 Digester system containing a single vessel serving as all of a chip bin, steaming vessel, and chip chuteDec 05, 94Jun 03, 97[D21C]
5,607,549 Method for the manufacture of cooking liquors of different sulphidity by green liquor crystallizationJun 15, 95Mar 04, 97[D21C]

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