Description
Class D21D : TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
Subclass 1/30: Methods of beating or refining; Beaters of the Hollander type (knotter screens D21F) Methods of refining Disc mills
D21D 1/30
Sub-Class
Stats
- 112 US PATENTS IN FORCE
- 33 US APPLICATIONS PENDING
- 20 Total Patent Owners
- 192 TOTAL INVENTORS
Recent Patents
| Patent # | Title | Filing Date | Issue Date | Patent Owner |
|---|---|---|---|---|
| 12241203 | Blade segment for refiner | Jun 07, 21 | Mar 04, 25 | VALMET TECHNOLOGIES OY |
| 12215462 | Refiner | Jan 24, 22 | Feb 04, 25 | Aikawa Iron Works Co. Ltd. |
| 12214359 | Colloid mill | Mar 16, 22 | Feb 04, 25 | Fristam Pumps USA Limited Partnership |
| 12188177 | Apparatus for grinding a fibrous material suspension | Mar 12, 21 | Jan 07, 25 | Andritz AG |
| 12139854 | Refiner plate segment | Aug 19, 21 | Nov 12, 24 | Voith Patent GmbH |
| 12123140 | Process to produce microfibrillated cellulose by impacts | Aug 07, 20 | Oct 22, 24 | Suzano S.A. |
| 12123143 | Process for producing a nanocelullosic material comprising at least two stages of defibrillation of cellulosic feedstock and at least one intermediate fractioning stage | Jul 17, 19 | Oct 22, 24 | Suzano S.A. |
| 12060680 | Accessory for disc refiner | Aug 24, 22 | Aug 13, 24 | Valmet AB |
| 12043959 | Method for controlling a device for treating high-consistency pulp | Jan 09, 20 | Jul 23, 24 | Voith Patent GmbH |
| 12031270 | Refiner segment | Mar 23, 22 | Jul 09, 24 | Valmet AB |
| 12012695 | Double-disc refiner | Feb 17, 20 | Jun 18, 24 | Valmet AB |
| 12006627 | Device and method for treating fibres | May 08, 19 | Jun 11, 24 | Not available |
| 11982053 | Refiner plate having inter-bar wear protrusions | Oct 07, 19 | May 14, 24 | Andritz, Inc. |
| 11982054 | Apparatus and method for processing wood fibers | Aug 22, 22 | May 14, 24 | International Paper Company |
| 11965290 | Apparatus and method for processing wood fibers | May 10, 21 | Apr 23, 24 | International Paper Company |
| 11905659 | Refiner segment having bar weakening sections | Feb 20, 19 | Feb 20, 24 | Valmet AB |
| 11905658 | Apparatus and method for processing wood fibers | Oct 06, 20 | Feb 20, 24 | International Paper Company |
| 11905660 | Deflaker with serrated tooth pattern | Nov 17, 22 | Feb 20, 24 | Andritz, Inc. |
| 11898310 | Device for mechanically processing lignocellulose-containing fibrous material | Feb 18, 20 | Feb 13, 24 | VALMET TECHNOLOGIES OY |
| 11866883 | Refiner segment with varying depth profile | Jun 03, 19 | Jan 09, 24 | Valmet AB |
Recent Publications
| Publication # | Title | Filing Date | Pub Date | Patent Owner |
|---|---|---|---|---|
| 2025/0043,510 | Refining Segment for Refiner | Oct 07, 22 | Feb 06, 25 | VALMET TECHNOLOGIES OY |
| 2025/0027,271 | REFINER FILLING PIECE HAVING MULTIPLE COATINGS ON BARS | Dec 07, 22 | Jan 23, 25 | Not available |
| 2025/0003,151 | PROCESS TO PRODUCE MICROFIBRILLATED CELLULOSE BY IMPACTS | Sep 05, 24 | Jan 02, 25 | Suzano S.A. |
| 2024/0426,051 | BLADE FOR A REFINER FOR REFINING LIGNOCELLULOSIC MATERIAL, AND REFINER COMPRISING AT LEAST ONE BLADE | May 29, 24 | Dec 26, 24 | Valmet AB |
| 2024/0426,052 | BLADE FOR A REFINER FOR REFINING LIGNOCELLULOSIC MATERIAL, AND REFINER COMPRISING AT LEAST ONE BLADE | May 29, 24 | Dec 26, 24 | Valmet AB |
| 2024/0392,502 | METHOD AND APPARATUS FOR PRODUCING A MOULDABLE CELLULOSIC FIBROUS MATERIAL | Sep 19, 22 | Nov 28, 24 | Not available |
| 2024/0360,622 | APPARATUS AND METHOD FOR PROCESSING WOOD FIBERS | Feb 19, 24 | Oct 31, 24 | Not available |
| 2024/0337,069 | HEMP PAPER PACKAGING MATERIAL FOR FOODSTUFF | Jun 20, 22 | Oct 10, 24 | Not available |
| 2024/0328,085 | ACCESSORY FOR DISC REFINER | Jun 12, 24 | Oct 03, 24 | Valmet AB |
| 2024/0295,076 | APPARATUS AND METHOD FOR PROCESSING WOOD FIBERS | May 13, 24 | Sep 05, 24 | Not available |
| 2024/0247,441 | APPARATUS AND METHOD FOR PROCESSING WOOD FIBERS | Apr 03, 24 | Jul 25, 24 | Not available |
| 2024/0229,355 | REFINER DISC | Apr 05, 22 | Jul 11, 24 | Valmet AB |
| 2023/0407,563 | REFINER FILLING PIECE HAVING VARIABLY COATED BARS | Aug 16, 21 | Dec 21, 23 | Not available |
| 2023/0220,624 | Blade Segment for Refiner | Jun 03, 21 | Jul 13, 23 | VALMET TECHNOLOGIES OY |
| 2023/0183,921 | Blade Element for Refiner | May 12, 21 | Jun 15, 23 | VALMET TECHNOLOGIES OY |
| 2023/0167,605 | DEFLAKER WITH SERRATED TOOTH PATTERN | Nov 17, 22 | Jun 01, 23 | Not available |
| 2022/0145,537 | Device for Mechanically Processing Lignocellulose-Containing Fibrous Material | Feb 18, 20 | May 12, 22 | VALMET TECHNOLOGIES OY |
| 2022/0098,791 | EXPERIMENTAL SYSTEM FOR STUDYING REFINING MECHANISM AND CHARACTERISTIC OF REFINER PLATE AND METHOD FOR OPERATING SAME | Dec 13, 21 | Mar 31, 22 | Not available |
| 2022/0074,139 | Pulping Methods, Methods for Manufacturing Paperboard, and Paperboard Structures | Sep 08, 21 | Mar 10, 22 | Not available |
| 2021/0180,253 | REFINER PLATE HAVING GROOVES IMPARTING ROTATIONAL FLOW TO FEED MATERIAL | Oct 27, 20 | Jun 17, 21 | Not available |
Top Owners in This Subclass
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Patents Issued To Date - By Filing Year
Average Time to Issuance
- 29 Months (last 2 years Issuances)
- 29 Months (last 5 years Issuances)