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Class Information
Number: 162/61
Name: Paper making and fiber liberation > Processes of chemical liberation, recovery or purification of natural cellulose or fibrous material > Regulatory
Description: Processes directed to controlling the conditions of the digestion or fiber treatment, e.g., temperature, pressure, feed of fibers or treating agent, etc.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7390669 |
Simultaneous and rapid determination of multiple component concentrations in a Kraft liquor process stream |
Jun. 24, 2008 |
| 7229526 |
Method and apparatus for the feeding of fibers |
Jun. 12, 2007 |
| 6946056 |
Method for regulating the manufacturing of pulp by optically measuring the amount of hexenuronic acid |
Sep. 20, 2005 |
| 6843885 |
Method for controlling the cooking temperature in a continuous vapour phase digester |
Jan. 18, 2005 |
| 6524437 |
Process for peroxide bleaching wherein the concentrations of Mn and Fe are monitored and maintained |
Feb. 25, 2003 |
| 6447639 |
Process for controlling a digester using real time measurement of moisture content and species of wood |
Sep. 10, 2002 |
| 6409882 |
Tall oil refining improvement |
Jun. 25, 2002 |
| 6398914 |
Method and device for process control in cellulose and paper manufacture |
Jun. 4, 2002 |
| 6346167 |
Dissolved solids control in pulp production |
Feb. 12, 2002 |
| 6325889 |
Hydraulic vessel system having a downwardly feeding separator |
Dec. 4, 2001 |
| 6238517 |
Method for controlling oxygen delignification of pulp |
May. 29, 2001 |
| 6159337 |
Dissolved organic materials control in cellulose pulp production |
Dec. 12, 2000 |
| 6080274 |
Method for controlling a multi-phase screening apparatus |
Jun. 27, 2000 |
| 5858170 |
Method for pressurized peroxide bleaching |
Jan. 12, 1999 |
| 5766413 |
Process for isothermal cooking pulp in a continuous digester |
Jun. 16, 1998 |
| 5755928 |
Method for automated monitoring of pulp retention time using an iodide salt as a tracer |
May. 26, 1998 |
| 5643410 |
Batch process for preparing kraft pulp in a batch digesting process |
Jul. 1, 1997 |
| 5632859 |
Intergral pulp mill and method of constructing an integral mill |
May. 27, 1997 |
| 5626766 |
Process for controlling solids-liquid separation |
May. 6, 1997 |
| 5597446 |
Method of controlling a position of rotor in a high pressure feeder |
Jan. 28, 1997 |
| 5582684 |
Method of determining degree of reduction in a sulfate liquor using IR and UV spectroscopy |
Dec. 10, 1996 |
| 5567274 |
Method of controlling pressurized ozone to a pulp delignification reactor |
Oct. 22, 1996 |
| 5393378 |
Method for measuring and controlling fiber variations in paper sheet |
Feb. 28, 1995 |
| 5367894 |
Apparatus and method for washing cellulosic pulp |
Nov. 29, 1994 |
| 5306391 |
Control of chemical dosage to a pulp slurry |
Apr. 26, 1994 |
| 5282931 |
Determination and control of effective alkali in kraft liquors by IR spectroscopy |
Feb. 1, 1994 |
| 5277759 |
Method of controlling sulfidity of a sulfate cellulose mill |
Jan. 11, 1994 |
| 5160581 |
Method for oxygen bleaching paper pulp |
Nov. 3, 1992 |
| 5122229 |
Apparatus and method for washing cellulosic pulp |
Jun. 16, 1992 |
| 5066362 |
Extended delignification in pressure diffusers |
Nov. 19, 1991 |
| 5032223 |
Procedure for determining and controlling the composition proportions of wood chip mixes in alkaline pulp digestion processes |
Jul. 16, 1991 |
| 4994145 |
Process for producing a constant distribution of a selected property across the width of pulp mat on a pulp washing surface |
Feb. 19, 1991 |
| 4944841 |
Procedure for controlling alkaline pulping processes |
Jul. 31, 1990 |
| 4943347 |
Method of refining fibrous material by controlling the feed rate of material or the gap distance between discs |
Jul. 24, 1990 |
| 4889593 |
Method of determining rapidly the concentration of the total sulphur dioxide and the lignosulphonate present in sulphite pulping process liquors |
Dec. 26, 1989 |
| 4886576 |
Method and apparatus for producing uniform pulp yields by controlling the operation of a refiner |
Dec. 12, 1989 |
| 4869784 |
Controlling water input to pulp washing system based on measurements on reduced dimension stream |
Sep. 26, 1989 |
| 4857146 |
Process for increasing the solids content of black liquor at its recovery in a sulfate pulping process |
Aug. 15, 1989 |
| 4853084 |
Method for controlling alkaline pulping process |
Aug. 1, 1989 |
| 4842689 |
Method for controlling sulphite pulping and hydrolytic processes by means of rapid furfural analyzer |
Jun. 27, 1989 |
| 4840704 |
Controlling characteristics of a pulp mat on a pulp washing surface |
Jun. 20, 1989 |
| 4808263 |
Method for fiberizing wastepaper using an inline control valve for make-up air |
Feb. 28, 1989 |
| 4743339 |
Method for controlling the digestion of pulp by IR spectroscopy |
May. 10, 1988 |
| 4718979 |
Method for rapid determination of the contents of lignin, monosaccharides and organic acids in the process solutions of sulfite pulping |
Jan. 12, 1988 |
| 4717672 |
Oxidation sensor |
Jan. 5, 1988 |
| 4692210 |
Method and apparatus for measuring the distribution of fiber widths and adjusting the refining of fibrous stock |
Sep. 8, 1987 |
| 4626318 |
Method of controlling a pulp refiner by measuring freeness and removing the latency from the pulp |
Dec. 2, 1986 |
| 4601787 |
Method of bringing a digester up to cooking temperature |
Jul. 22, 1986 |
| 4540468 |
Method for determining the degree of completion and pulp yield |
Sep. 10, 1985 |
| 4451331 |
Process and apparatus for producing pulp |
May. 29, 1984 |
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