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Class Information
Number: 162/248
Name: Paper making and fiber liberation > Apparatus > Digester > Forced circulation or percolation of fluid only
Description: Apparatus having means to positively force the flow of digestion chemicals through the material being treated.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7556713 |
Method and system for feeding cellulose chips to a high pressure continuous cooking system |
Jul. 7, 2009 |
| 7387708 |
Process for feeding pulp into a blow tank or storage tank |
Jun. 17, 2008 |
| RE39208 |
Method of treating material in a continuous digester |
Aug. 1, 2006 |
| 6589391 |
Top separator with intraseal for digester vessel in a pulp or fiber processing system |
Jul. 8, 2003 |
| 6375795 |
Minimization of malodorous gas release from a cellulose pulp mill feed system |
Apr. 23, 2002 |
| 6375796 |
Method of treating material in a continuous digester |
Apr. 23, 2002 |
| 6332954 |
Continuous digester system having a top separator |
Dec. 25, 2001 |
| 6280568 |
Dissolved organic material control in a cellulose pulp continuous digester |
Aug. 28, 2001 |
| 6280567 |
System and method for treatment of cellulose-containing material prior to pulp digestion |
Aug. 28, 2001 |
| 6254723 |
Method for continuous cooking in a single-vessel digester |
Jul. 3, 2001 |
| 6139689 |
Apparatus for digesting pulp in a displacement batch digester that uses displacement liquor having a sufficient hydrostatic head |
Oct. 31, 2000 |
| 6129816 |
Tapered screen assembly for a cellulose pulp digester |
Oct. 10, 2000 |
| 6120647 |
Simplified liquid removal system for a cellulose pulp digester |
Sep. 19, 2000 |
| 6113742 |
Digester having screening arrangement for isothermal cooking of fibrous material |
Sep. 5, 2000 |
| 6086712 |
DOM control in cellulose pulp production |
Jul. 11, 2000 |
| 5968314 |
Chip feeding for a digester |
Oct. 19, 1999 |
| 5849150 |
Low dissolved solids control in pulp production |
Dec. 15, 1998 |
| 5849151 |
Continuous digester having means for implementing low dissolved solids profiling |
Dec. 15, 1998 |
| 5827401 |
Screen system for a continuous digester |
Oct. 27, 1998 |
| 5746890 |
Device for admixing a processing agent into a pulp suspension |
May. 5, 1998 |
| 5662775 |
Continuous digester with dissolved solids handling |
Sep. 2, 1997 |
| 5660686 |
Cooking with spent liquor pretreatment of cellulose material |
Aug. 26, 1997 |
| 5622598 |
Chip pumping to a digester |
Apr. 22, 1997 |
| 5620562 |
Dissolved solids control in pulp production |
Apr. 15, 1997 |
| 5567280 |
Digester for cooking pulp having staggered circular screens for isothermal cooking |
Oct. 22, 1996 |
| 5536366 |
Digester system for implementing low dissolved solids profiling |
Jul. 16, 1996 |
| 5536367 |
Pulp digester cleaning system |
Jul. 16, 1996 |
| 5529661 |
Process for controlling the flow of cellulosic fiber material through an impregnation vessel |
Jun. 25, 1996 |
| 5496445 |
Method and apparatus for waste paper treatment |
Mar. 5, 1996 |
| 5476572 |
Chip feeding for a continuous digester |
Dec. 19, 1995 |
| 5236554 |
Digester having plural screens with means for controlling liquid injection and withdrawal |
Aug. 17, 1993 |
| 5164042 |
Method and plant for producing high-yield pulp from pulp chip material containing lignocellulose |
Nov. 17, 1992 |
| 5059284 |
Apparatus to displace a digester from both ends |
Oct. 22, 1991 |
| 5053108 |
High sulfidity cook for paper pulp using black liquor sulfonization of steamed chips |
Oct. 1, 1991 |
| 5021127 |
Extended delignification in pressure diffusers |
Jun. 4, 1991 |
| 4838995 |
Process for bleaching cellulose pulp, a plant for preforming said process, and a screw press for use with said process and plant |
Jun. 13, 1989 |
| 4693785 |
Digester having plural screens and means for controlling the liquid withdrawal |
Sep. 15, 1987 |
| 4326913 |
Method and apparatus in defibration |
Apr. 27, 1982 |
| 4259151 |
Pulping apparatus |
Mar. 31, 1981 |
| 4193839 |
Flow control method and apparatus for continuous wood chip digester screenless liquor extractor |
Mar. 18, 1980 |
| 4177105 |
Apparatus for delignifying and bleaching cellulose pulp |
Dec. 4, 1979 |
| 4120748 |
Digester system for delivering wood chips in an even layer into a digester |
Oct. 17, 1978 |
| 4093511 |
Apparatus for oxygen bleaching of pulp including recirculation of exhaust gases |
Jun. 6, 1978 |
| 4071399 |
Apparatus and method for the displacement impregnation of cellulosic chips material |
Jan. 31, 1978 |
| 4061193 |
Method and apparatus for digesting cellulose material without screening digesting liquid withdrawn through the digester top |
Dec. 6, 1977 |
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