D21C9/16 - CPC Classification Index

ClassID:

126421 ⎘

D21C9/16 - CPC Classification

Classification description:

After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere; Bleaching ; Apparatus therefor with per compounds

Sub-classes:

D21C9/163 » {with peroxides} 199
D21C9/166 » {with peracids} 30

Recent Application in this class:

20250171958

2025-05-29

A Bleaching Process

20250116065

2025-04-10

DISPERSIBLE NON-WOOD PULP

20240309585

2024-09-19

MODIFIED SULFURIC ACID AND USES THEREOF

20240003087

2024-01-04

Dispersible non-wood pulp

20230382852

2023-11-30

MODIFIED SULFURIC ACID AND USES THEREOF

20230167604

2023-06-01

High efficiency fiber bleaching process

20230009849

2023-01-12

ODOR CONTROL PULP COMPOSITION

20220267956

2022-08-25

Arylsulfonic acid—modified sulfuric acid and uses thereof

20220267951

2022-08-25

Modified sulfuric acid and uses thereof

#10

20210381163

2021-12-09

Method for separating lignin from ligno-cellulosic material

#11

20210284935

2021-09-16

Enhanced peroxygen stability in multi-dispense TAED-containing peroxygen solid

#12

20210269973

2021-09-02

Method for recovery of cellulosic material from waste ligno-cellulosic material

#13

20210269394

2021-09-02

Modified sulfuric acid and uses thereof

#14

20210032812

2021-02-04

BLEACHING AND SHIVE REDUCTION PROCESS FOR NON-WOOD FIBERS

#15

20200385928

2020-12-10

Odor control pulp composition

#16

20200095728

2020-03-26

Method for isolating alpha cellulose from lignocellulosic materials

#17

20190203159

2019-07-04

Enhanced peroxygen stability in multi-dispense TAED-containing peroxygen solid

#18

20190186075

2019-06-20

Process for treating pulp

#19

20180274172

2018-09-27

Odor control pulp composition

#20

20180135245

2018-05-17

Modified cellulose from chemical fiber and methods of making and using the same

#21

20180119346

2018-05-03

Method of making bleached microcrystalline cellulose

#22

20170350072

2017-12-07

Enzymatic process combined with hot caustic extraction for the removal of hemicelluloses from paper-grade pulp

#23

20170335515

2017-11-23

Methods of pulp fiber treatment

#24

20170130397

2017-05-11

METHOD OF PRODUCING DISSOLVING PULP FROM LIGNOCELLULOSIC MATERIAL

#25

20160298294

2016-10-13

Method for delignifying and bleaching pulp

#26

20160289606

2016-10-06

Enhanced peroxygen stability in multi-dispense TAED-containing peroxygen solid

#27

20160273162

2016-09-22

Pineapple leaf fiber fine treatment method

#28

20150337496

2015-11-26

Bleaching and shive reduction process for non-wood fibers

#29

20140113966

2014-04-24

Perhydrolase variant providing improved specific activity

#30

20130126109

2013-05-23

Silicate Free Refiner Bleaching

#31

20130102671

2013-04-25

Perhydrolase variant providing improved specific activity

#32

20130102670

2013-04-25

Perhydrolase variant providing improved specific activity

#33

20130102669

2013-04-25

Perhydrolase variant providing improved specific activity

#34

20130102668

2013-04-25

Perhydrolase variant providing improved specific activity

#35

20130102667

2013-04-25

Perhydrolase variant providing improved specific activity

#36

20130102666

2013-04-25

Perhydrolase variant providing improved specific activity

#37

20130102665

2013-04-25

PERHYDROLASE VARIANT PROVIDING IMPROVED SPECIFIC ACTIVITY

#38

20130078695

2013-03-28

Pretreatment Method for Producing Water-Soluble Sugars From Lignocellulosic Material

#39

20120305208

2012-12-06

Process for recovering molybdate or tungstate from aqueous solutions

#40

20120015860

2012-01-19

GENTLE BLEACHING AGENT

#41

20120006501

2012-01-12

Method for preparing nonwood fiber paper

#42

20120005839

2012-01-12

GENTLE BLEACHING AGENT

#43

20110265964

2011-11-03

Process in a (D) stage bleaching of softwood pulps in a presence of Mg(OH)2

#44

20110240238

2011-10-06

Process of bleaching hardwood pulps in a D1 or D2 stage in a presence of a weak base

#45

20110214825

2011-09-08

METHOD FOR MANUFACTURING MECHANICAL PULP AND USE OF THE MECHANICAL PULP

#46

20110203485

2011-08-25

BLEACHING METHOD

#47

20110036524

2011-02-17

Method of bleaching a pulp

#48

20100163193

2010-07-01

Process for the bleaching of mechanical paper pulp

#49

20100139875

2010-06-10

Composition and process for the treatment of fibre material

#50

20100084101

2010-04-08

METHOD FOR FUNCTIONALISING CARBOHYDRATES

#51

20090274598

2009-11-05

Process for recovering molybdate or tungstate from aqueous solutions

#52

20090032207

2009-02-05

Process for producing mechanical pulp suitable for paper or cardboard making

#53

20090004706

2009-01-01

METHODS TO ENHANCE THE ACTIVITY OF LIGNOCELLULOSE-DEGRADING ENZYMES

#54

20090004698

2009-01-01

METHODS TO ENHANCE THE ACTIVITY OF LIGNOCELLULOSE-DEGRADING ENZYMES

#55

20090004692

2009-01-01

METHODS TO ENHANCE THE ACTIVITY OF LIGNOCELLULOSE-DEGRADING ENZYMES

#56

20090000751

2009-01-01

Bleaching process with at least one extraction stage

#57

20080142175

2008-06-19

Process of bleaching hardwood pulps in a D1 or D2 stage in a presence of a weak base

#58

20080142174

2008-06-19

Process of bleaching softwood pulps in a D1 or D2 stage in a presence of a weak base

#59

20080087390

2008-04-17

MULTI-STEP PULP BLEACHING

#60

20080070284

2008-03-20

Oxidative, Reductive, Hydrolytic and Other Enzymatic Systems for Oxidizing, Reducing, Coating, Coupling or Cross-Linking Natural and Artificial Fiber Materials, Plastic Materials or Other Natural or Artificial Monomer to Polymer Materials

#61