ClassID:

127084

D21H27/08 - CPC Classification

Classification description:

Special paper not otherwise provided for, e.g. made by multi-step processes Filter paper

Recent Application in this class:
#1
20260150880
2026-06-04

FILTER WRAPPER FOR AEROSOL GENERATING ARTICLES AND FILTERS FOR AEROSOL GENERATING ARTICLES INCLUDING THE SAME

#2
20260125851
2026-05-07

PROCESS AND FIBRE PROCESSING APPARATUS FOR THE PREPARATION OF A PULP ADDITIVE FROM A SUGAR BEET STARTING MATERIAL

#3
20260029350
2026-01-29

METHOD FOR PREPARING ULTRAVIOLET (UV)-DEGRADABLE AND FUNCTIONALIZED CELLULOSE PAPER-BASED COLORIMETRIC SENSOR, AND APPLICATION THEREOF

#4
20250249430
2025-08-07

Water filter and medium therefor

#5
20250163651
2025-05-22

METHOD FOR PRODUCING A FILTERING MATERIAL

#6
20250134162
2025-05-01

Filter for Smoking Articles and Filter Paper Forming the Same Consisting of Plant Fibres

#7
20240408523
2024-12-12

FILTER MATERIAL FOR AIR FILTER AND METHOD FOR PRODUCING FILTER MATERIAL

#8
20240407430
2024-12-12

CIGARETTE FILTER INCLUDING LYOCELL TOW

#9
20240400280
2024-12-05

THERMOPLASTIC-IMPREGNATED CELLULOSIC NONWOVEN AS A COMPOSTABLE FILTER MATERIAL FOR LIQUIDS

#10
20240367149
2024-11-07

Composition and Method for Making a Water Filter by Accretion

#11
20240206531
2024-06-27

Filter Comprising a Paper Substrate Modified With Natural Starch

#12
20240206530
2024-06-27

Filter Comprising A Paper Substrate Modified With A Natural Polysaccharide

#13
20240200279
2024-06-20

DECREASING FIBER DENSITY IN WET PARTS FORMED FROM SLURRIES

#14
20240175214
2024-05-30

FILTER MATERIAL FOR FOOD PACKAGING

#15
20240074490
2024-03-07

FILTER WITH ADDED LIQUID, FLAVOR INHALATION ARTICLE EQUIPPED WITH SAID FILTER, AND FLAVOR INHALATION ARTICLE PACKAGE

#16
20240026609
2024-01-25

Filter Paper for Cigarette Filters and Filter Comprising It

#17
20230357990
2023-11-09

BIO-PROTECTIVE COMPOSITE MATERIALS, METHOD OF MANUFACTURING THE BIO-PROTECTIVE COMPOSITE MATERIALS, AND FACE MASK HAVING THE BIO-PROTECTIVE COMPOSITE MATERIALS

#18
20230285883
2023-09-14

Soy based filtration system

#19
20230278008
2023-09-07

FILTER MEDIUM FOR AIR FILTERS AND METHOD FOR PRODUCING SAME

#20
20230142418
2023-05-11

WET NON-WOVEN FABRIC, PREPARATION METHOD THEREFOR AND WATER TREATMENT MEMBRANE CONTAINING WET NON-WOVEN FABRIC

#21
20230112349
2023-04-13

Air filtration material, device for decontaminating air by filtration and manufacturing method.

#22
20230022704
2023-01-26

HOT EXTRACTION PAPER

#23
20220074145
2022-03-10

Method for Making Air Purifying Paper Goods

#24
20220064867
2022-03-03

Hot-extraction paper

#25
20220062807
2022-03-03

ANTIVIRAL GLASS FIBER TREATMENT, PROCESS AND METHOD OF MANUFACTURING

#26
20220022529
2022-01-27

Paper Sheet and Method of Making It

#27
20210254285
2021-08-19

CELLULOSE MATERIALS AND METHODS OF MAKING AND USING THE SAME

#28
20210140108
2021-05-13

Aramid-based paper with improved properties

#29
20210123189
2021-04-29

Filter paper

#30
20210062427
2021-03-04

Porous substrate with porous nano-particles structure and production method thereof

#31
20210016213
2021-01-21

WET NON-WOVEN FABRIC FOR FILTER, FILTER MEDIUM FOR FILTER, AND FILTER

#32
20210010163
2021-01-14

LYOCELL FIBER WITH INCREASED TENDENCY TO FIBRILLATE

#33
20200362507
2020-11-19

Superficially treated flexible materials suitable for filtering and separating immiscible liquids

#34
20200362473
2020-11-19

High-permeability cellulose fibers

#35
20200323260
2020-10-15

Multifilter segment, smoking article with multifilter segment, and multifilter segment inspection method

#36
20200323258
2020-10-15

Filtered smoking article

#37
20200292512
2020-09-17

Chemical detection of substances by utilizing a sample medium impregnated with chemicals

#38
20200199823
2020-06-25

Glass Interleaver Paper Produced With Coarse Fibers

#39
20200086255
2020-03-19

Soy based filtration system

#40
20200032454
2020-01-30

Microfibrillated cellulose foams

#41
20190390408
2019-12-26

Aromatized and flavored paper products

#42
20190242064
2019-08-08

Substrates with metal nanoparticles, related articles, and a continuous process for making same

#43
20190217232
2019-07-18

Preparation method of cotton bast fiber and chitosan composite non-woven fabric for filtration

#44
20190137461
2019-05-09

Chemical detection of substances by utilizing a sample medium impregnated with solid test chemicals

#45
20190070540
2019-03-07

Filter medium for liquid filter and liquid filter

#46
20190062998
2019-02-28

Cellulose materials and methods of making and using same

#47
20190059443
2019-02-28

Filter paper for cigarette filters

#48
20180228207
2018-08-16

Marked filter paper for use as test substrate in standardized methods for evaluation of the ignition propensity of cigarettes

#49
20180155875
2018-06-07

PROCESS FOR THE PRODUCTION OF PAPER OR PAPERBOARD, PAPER OR PAPERBOARD PRODUCT OBTAINED AND USES THEREOF

#50
20170165595
2017-06-15

Filter element with a luminescent marker

#51
20160367922
2016-12-22

Multilayer filter medium for filter, method for producing the same, and air filter

#52
20160279604
2016-09-29

Soil adsorbing composites, compositions and methods for using same

#53
20160041134
2016-02-11

Chemical detection of substances by utilizing a sample medium impregnated with solid test chemicals

#54
20160032494
2016-02-04

High-permeability cellulose fibers

#55
20160016717
2016-01-21

Fibrous substrate containing fibers and nanofibrillar polysaccharide

#56
20150336039
2015-11-26

Polyethylene Fiber, Its Use And Process For Its Manufacture

#57
20150211451
2015-07-30

FILTERING MATERIAL FOR FILTER AND PRODUCTION PROCESS THEREFOR

#58
20150203607
2015-07-23

Cross-linked polyethylene fiber, its use and process for its manufacture

#59
20150201671
2015-07-23

Cigarette paper additive having harm reduction function and application thereof

#60
20150173416
2015-06-25

Cigarette paper with homogeneous visual impression

#61
20150173414
2015-06-25

Filter paper that disintegrates quickly in water

#62
20150164132
2015-06-18

Cigarette paper with improved air-permeability

#63
20150059996
2015-03-05

Oil-resistant filter wrapper paper

#64
20150001148
2015-01-01

Filter Media

#65
20140360145
2014-12-11

Filter medium for filter, method for producing the same, and filter

#66
20140231036
2014-08-21

Fibre product for packaging

#67
20140137880
2014-05-22

Oil-resistant filter wrapper paper

#68
20140047809
2014-02-20

Flutable fiber webs with high dust holding capacity

#69
20140011118
2014-01-09

Carbon substrate for gas diffusion layer, gas diffusion layer using the same, and electrode for fuel cell, membrane-electrode assembly and fuel cell comprising the gas diffusion layer

#70
20130333852
2013-12-19

Flutable fiber webs with high dust holding capacity

#71
20130333341
2013-12-19

Flutable fiber webs with high dust holding capacity

#72
20130330751
2013-12-12

Sample preservation method and sample application substrate

#73
20130284668
2013-10-31

Curable epoxide containing formaldehyde-free compositions, articles including the same, and methods of using the same

#74
20130263385
2013-10-10

Parchmentized fibrous support containing parchmentizable synthetic fibers and method of manufacturing the same

#75
20120312488
2012-12-13

Method for forming a fibrous media

#76
20120097032
2012-04-26

Flutable fiber webs with high dust holding capacity

#77
20120071589
2012-03-22

Polymer Fiber, Its Use And Process For Its Manufacture

#78
20120031063
2012-02-09

LOW-BASIS-WEIGHT FILTER MEDIA FOR AIR FILTERS

#79
20120009841
2012-01-12

Polyethylene Fiber, Its Use And Process For Its Manufacture

#80
20110283671
2011-11-24

Air filter medium

#81
20100319543
2010-12-23

Flutable fiber webs with high dust holding capacity

#82
20100234524
2010-09-16

Products

#83
20100200184
2010-08-12

Wood Pulp Paper with High Antimicrobial Barrier Level

#84
20100187712
2010-07-29

Method and apparatus for forming a fibrous media

#85
20100187171
2010-07-29

Fibrous media

#86
20100133173
2010-06-03

Wet type nonwoven fabric and filter

#87
20100031618
2010-02-11

High dust holding capacity filter media

#88
20090320428
2009-12-31

Air filter medium

#89
20090318288
2009-12-24

CARBON-ENRICHED MATERIAL

#90
20080010853
2008-01-17

Process for Producing Dried Singulated Fibers Using Steam and Heated Air

#91
20070271889
2007-11-29

Nonwoven fibrous mat for MERV filter and method

#92
20070137821
2007-06-21

Reduced byproduct polyamine-epihalohydrin resins

#93
20070102128
2007-05-10

Wood pulp paper with high antimicrobial barrier level

#94
20070044443
2007-03-01

Multiple integrated-layer ceramic fiber filter paper and method

#95
20060188609
2006-08-24

Beverage package

#96
20050086828
2005-04-28

Process for producing dried, singulated fibers using steam and heated air

#97
20050061733
2005-03-24

Filter material

#98
20050022415
2005-02-03

System for making dried singulated crosslinked cellulose pulp fibers

#99
20050006042
2005-01-13

Reduced by product polyamine-epihalohydrin resins

#100
18939596
2025-04-15

Cellulose based biodegradable absorptive filter and method of making

#101
18808127
2024-12-24

Method for making an adsorptive air filter

#102
18665929
2024-10-01

Biodegradable air filter from date palm and method of fabrication thereof