D21C 9/18
De-watering
Official title: De-watering (de-watering in general F26B); {Elimination of cooking or pulp-treating liquors from the pulp}(D21C9/002, D21C9/02 take precedence; paper-making machines D21F; strainers in digesters D21C7/00; presses in general B30B)
D21C9/18 (De-watering) appears on 231 US grants and 200 published applications in this corpus.
Search patents in D21C- Granted patents
- 231
- Published applications
- 200
- Assignees
- 144
- Inventors
- 475
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 6 | 0 |
| 1978 | 4 | 0 |
| 1979 | 2 | 0 |
| 1980 | 2 | 0 |
| 1981 | 3 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 3 | 0 |
| 1986 | 2 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 4 | 0 |
| 1991 | 7 | 0 |
| 1992 | 3 | 0 |
| 1993 | 3 | 0 |
| 1994 | 5 | 0 |
| 1995 | 4 | 0 |
| 1996 | 2 | 0 |
| 1997 | 3 | 0 |
| 1998 | 5 | 0 |
| 1999 | 1 | 0 |
| 2000 | 6 | 0 |
| 2001 | 4 | 0 |
| 2002 | 3 | 1 |
| 2003 | 7 | 8 |
| 2004 | 7 | 12 |
| 2005 | 5 | 9 |
| 2006 | 5 | 3 |
| 2007 | 4 | 3 |
| 2008 | 5 | 5 |
| 2009 | 1 | 3 |
| 2010 | 4 | 12 |
| 2011 | 4 | 5 |
| 2012 | 5 | 2 |
| 2013 | 8 | 6 |
| 2014 | 9 | 9 |
| 2015 | 5 | 12 |
| 2016 | 7 | 16 |
| 2017 | 10 | 6 |
| 2018 | 8 | 7 |
| 2019 | 10 | 11 |
| 2020 | 7 | 13 |
| 2021 | 7 | 10 |
| 2022 | 4 | 8 |
| 2023 | 5 | 18 |
| 2024 | 13 | 10 |
| 2025 | 7 | 7 |
| 2026 | 7 | 4 |
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
- Method for producing a transfer mixture by the direct dissolution process, using a thin layer evaporator15 Sep 2026US 12,735,840 B2List Technology AG
- Method of controlling the drying of cellulose pulp in a drying step of a pulp production process15 Sep 2026US 12,735,841 B2Andritz Technology and Asset Management GmbH
- Method and system for treating biomass8 Sep 2026US 12,729,483 B2Valmet Corporation
- Method and apparatus for treating mixtures of liquids and solids19 May 2026US 12,630,976 B2Lean Pulp Oy
- Pulp mixture6 Aug 2026US 2026/0226680 A1SöDra SkogsäGarna Ekonomisk FöRening
- Production method of ctmp having a low extractives content23 Jul 2026US 2026/0210047 A1Billerud Aktiebolag (publ)
- Fiber wash system and method19 Feb 2026US 2026/0049271 A1IntegroEnergy Group, Inc.
- Refined cotton dewatering device29 Jan 2026US 2026/0028773 A1Hubei Jinhanjiang Refined Cotton Co., Ltd.
- Method for preparing hydrophobic cellulose using pickering emulsion and hydrophobic cellulose prepared using the same28 Aug 2025US 2025/0270762 A1Korea Research Institute of Chemical Technology
Most cited
By later US patents
- Process of manufacturing and using highly refined fiber mass86US 7,094,317 B2Fiberstar, Inc. · 2006
- Pulp dewatering process67US 4,969,976 AAllied Colloids Limited · 1990
- Method and apparatus for conversion of cellulosic material to ethanol51US 8,123,864 B2Inbicon A/S · 2012
- Screen segment for filters for thickening fiber suspensions42US 4,950,403 A1990
- Method and system for producing market pulp and products thereof31US 8,916,024 B2Buckman Laboratories International, Inc. · 2014