Description
Class D21D : TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
Subclass 1/34: Methods of beating or refining; Beaters of the Hollander type (knotter screens D21F) Methods of refining Other mills or refiners
D21D 1/34
Sub-Class
Stats
- 7 US PATENTS IN FORCE
- 3 US APPLICATIONS PENDING
- 3 Total Patent Owners
- 33 TOTAL INVENTORS
Recent Patents
| Patent # | Title | Filing Date | Issue Date | Patent Owner |
|---|---|---|---|---|
| 12214359 | Colloid mill | Mar 16, 22 | Feb 04, 25 | Fristam Pumps USA Limited Partnership |
| 12209363 | Method for producing microscale and/or nanoscale fiber material | Apr 05, 18 | Jan 28, 25 | Weidmann Holding AG |
| 12116732 | Paper products incorporating surface enhanced pulp fibers and having decoupled wet and dry strengths and methods of making the same | Sep 23, 20 | Oct 15, 24 | Domtar Paper Company, LLC |
| 12006627 | Device and method for treating fibres | May 08, 19 | Jun 11, 24 | Not available |
| 10196775 | Method for processing grass for manufacturing paper, paperboard and cardboard | Dec 17, 14 | Feb 05, 19 | Not available |
| 8974634 | Cellulose nanofibers | Nov 12, 10 | Mar 10, 15 | MITSUBISHI CHEMICAL CORPORATION, OJI HOLDINGS CORPORATION, |
| 5171402 | Dispersible aramid pulp | Jun 06, 91 | Dec 15, 92 | E. I. DU PONT DE NEMOURS AND COMPANY |
Recent Publications
| Publication # | Title | Filing Date | Pub Date | Patent Owner |
|---|---|---|---|---|
| 2024/0150,962 | Method for Manufacturing Refining Segment and Refining Segment | Oct 26, 23 | May 09, 24 | Valmet Technologies, Inc. |
| 2023/0175,205 | PRETREATMENT METHODS FOR COTTON TEXTILE WASTE FABRIC | Dec 06, 22 | Jun 08, 23 | Not available |
| 2023/0071,986 | System and method of producing micro fibrillated cellulose (MFC) | Jul 18, 22 | Mar 09, 23 | Not available |
Top Owners in This Subclass
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Patents Issued To Date - By Filing Year
Average Time to Issuance
- 34 Months (last 2 years Issuances)
- 34 Months (last 5 years Issuances)