D21D 5/02
Straining or screening the pulp
D21D5/02 (Straining or screening the pulp) appears on 522 US grants and 245 published applications in this corpus.
Search patents in D21D- Granted patents
- 522
- Published applications
- 245
- Assignees
- 174
- Inventors
- 603
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 3 | 0 |
| 1978 | 7 | 0 |
| 1979 | 6 | 0 |
| 1980 | 10 | 0 |
| 1981 | 11 | 0 |
| 1982 | 7 | 0 |
| 1983 | 7 | 0 |
| 1984 | 10 | 0 |
| 1985 | 9 | 0 |
| 1986 | 8 | 0 |
| 1987 | 17 | 0 |
| 1988 | 12 | 0 |
| 1989 | 12 | 0 |
| 1990 | 21 | 0 |
| 1991 | 27 | 0 |
| 1992 | 21 | 0 |
| 1993 | 20 | 0 |
| 1994 | 15 | 0 |
| 1995 | 15 | 0 |
| 1996 | 16 | 0 |
| 1997 | 23 | 0 |
| 1998 | 12 | 0 |
| 1999 | 14 | 0 |
| 2000 | 25 | 0 |
| 2001 | 13 | 10 |
| 2002 | 16 | 7 |
| 2003 | 18 | 13 |
| 2004 | 8 | 21 |
| 2005 | 9 | 14 |
| 2006 | 7 | 12 |
| 2007 | 4 | 15 |
| 2008 | 2 | 8 |
| 2009 | 4 | 8 |
| 2010 | 6 | 11 |
| 2011 | 5 | 5 |
| 2012 | 10 | 7 |
| 2013 | 4 | 12 |
| 2014 | 8 | 4 |
| 2015 | 5 | 10 |
| 2016 | 4 | 7 |
| 2017 | 5 | 5 |
| 2018 | 5 | 7 |
| 2019 | 6 | 13 |
| 2020 | 7 | 10 |
| 2021 | 7 | 5 |
| 2022 | 7 | 7 |
| 2023 | 3 | 8 |
| 2024 | 10 | 11 |
| 2025 | 9 | 8 |
| 2026 | 5 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method for fractionation of highly refined cellulose6 Oct 2026US 12,753,551 B2Stora Enso OYJ
- System and method for fiber cleaning, alignment, and sizing30 Jun 2026US 12,668,919 B1
- Method for treating textile fibers of different lengths16 Jun 2026US 12,655,583 B2Valmet Technologies Oy
- Method and apparatus for treating mixtures of liquids and solids19 May 2026US 12,630,976 B2Lean Pulp Oy
- Separation device and sheet manufacturing apparatus12 May 2026US 12,624,499 B2Seiko Epson Corporation
- Process for producing a fibrous material27 Aug 2026US 2026/0250912 A1Stora Enso OYJ
- Process of using non-wood fibers to create paper pulp16 Jul 2026US 2026/0201639 A1
- Screen, in particular pressure screen2 Apr 2026US 2026/0091329 A1Andritz Fiedler GmbH
- Systems and methods for monitoring reject streams from fiber processing units5 Feb 2026US 2026/0035859 A1Kadant Black Clawson LLC
- Rotor with forward-swept struts for pressure screen cylinders15 Jan 2026US 2026/0014591 A1Kadant Black Clawson LLC
Most cited
By later US patents
- Process for performing reactions in a liquid-solid catalyst slurry88US 5,527,473 A1996
- Integrated paper pulp and process machinery having integrated drive and control and methods of use thereof85US 6,617,720 B1Kadant Black Clawson LLC · 2003
- Screen basket having a removable and replaceable cylindrical mesh liner71US 5,968,357 AVoith Sulzer Paper Technology North America, Inc. · 1999
- Wave screen plate63US 4,954,249 ABeloit Corporation · 1990
- Rotary drum type device for separating solid particles from a liquid59US 5,618,424 ANagaoka International Corporation · 1997