Description
Class D21D : TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
Subclass 1/22: Methods of beating or refining; Beaters of the Hollander type (knotter screens D21F) Methods of refining Jordans
D21D 1/22
Sub-Class
Stats
- 16 US PATENTS IN FORCE
- 6 US APPLICATIONS PENDING
- 4 Total Patent Owners
- 40 TOTAL INVENTORS
Recent Patents
| Patent # | Title | Filing Date | Issue Date | Patent Owner |
|---|---|---|---|---|
| 12123140 | Process to produce microfibrillated cellulose by impacts | Aug 07, 20 | Oct 22, 24 | Suzano S.A. |
| 11905660 | Deflaker with serrated tooth pattern | Nov 17, 22 | Feb 20, 24 | Andritz, Inc. |
| 11891758 | Refiner blade element | Aug 27, 20 | Feb 06, 24 | VALMET TECHNOLOGIES OY |
| 11732587 | Blade element | Apr 28, 22 | Aug 22, 23 | VALMET TECHNOLOGIES OY |
| 11453977 | Set for the mechanical processing, in particular grinding of suspended fibrous material | Mar 30, 18 | Sep 27, 22 | Andritz Fiedler Gmbh |
| 11441267 | Refining to a desirable freeness | Jul 26, 19 | Sep 13, 22 | Eastman Chemical Company |
| 10400393 | Refiner | Dec 23, 14 | Sep 03, 19 | Valmet AB |
| 10385507 | Refiner beating method | Jun 06, 16 | Aug 20, 19 | AIKAWA IRON WORKS CO., LTD. |
| 10058898 | Device and method for removing impurities from shredded plastic | Jan 15, 14 | Aug 28, 18 | CVP Clean Value Plastics GmbH |
| 9976253 | Set for the mechanical processing, in particular grinding of suspended fibrous material | Jun 24, 15 | May 22, 18 | Andritz Fiedler Gmbh |
| 9267234 | Blade element and refiner | Dec 24, 13 | Feb 23, 16 | VALMET TECHNOLOGIES, INC. |
| 9222220 | Refiner and blade element | Jan 26, 12 | Dec 29, 15 | VALMET TECHNOLOGIES, INC. |
| 9145641 | Apparatus for disperser plate and method to refine paper | Nov 18, 13 | Sep 29, 15 | ANDRITZ INC. |
| 9133579 | Refiner and blade element | Jan 26, 12 | Sep 15, 15 | VALMET TECHNOLOGIES, INC. |
| 8945346 | Method and an apparatus for producing nanocellulose | Dec 30, 11 | Feb 03, 15 | UPM-KYMMENE CORPORATION |
| 8769800 | Process for making conical spare parts for refiners for the production of paper | Nov 21, 08 | Jul 08, 14 | Officine Airaghi S.R.L. |
Recent Publications
| Publication # | Title | Filing Date | Pub Date | Patent Owner |
|---|---|---|---|---|
| 2025/0003,151 | PROCESS TO PRODUCE MICROFIBRILLATED CELLULOSE BY IMPACTS | Sep 05, 24 | Jan 02, 25 | Suzano S.A. |
| 2023/0407,563 | REFINER FILLING PIECE HAVING VARIABLY COATED BARS | Aug 16, 21 | Dec 21, 23 | Not available |
| 2023/0175,203 | PROCESS TO PRODUCE MICROFIBRILLATED/NANOFIBRILLATED CELLULOSE BY IMPACTS | May 11, 21 | Jun 08, 23 | SUZANO S.A. |
| 2023/0167,605 | DEFLAKER WITH SERRATED TOOTH PATTERN | Nov 17, 22 | Jun 01, 23 | Not available |
| 2021/0062,422 | REFINER BLADE ELEMENT | Aug 27, 20 | Mar 04, 21 | VALMET TECHNOLOGIES OY |
| 2020/0063,343 | REFINING TO A DESIRABLE FREENESS | Jul 26, 19 | Feb 27, 20 | Eastman Chemical Company |
Top Owners in This Subclass
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Patents Issued To Date - By Filing Year
Average Time to Issuance
- 31 Months (last 2 years Issuances)
- 31 Months (last 5 years Issuances)