D21C 9/04
In diffusers
Official title: in diffusers {; Washing of pulp of fluid consistency without substantially thickening}
D21C9/04 (In diffusers) appears on 49 US grants and 12 published applications in this corpus.
Search patents in D21C- Granted patents
- 49
- Published applications
- 12
- Assignees
- 21
- Inventors
- 69
- Latest grant
- 23 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 3 | 0 |
| 1990 | 2 | 0 |
| 1991 | 5 | 0 |
| 1992 | 2 | 0 |
| 1993 | 4 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 4 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 3 | 0 |
| 2000 | 0 | 0 |
| 2001 | 2 | 0 |
| 2002 | 0 | 3 |
| 2003 | 3 | 0 |
| 2004 | 1 | 1 |
| 2005 | 1 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 0 |
| 2012 | 1 | 2 |
| 2013 | 0 | 0 |
| 2014 | 2 | 1 |
| 2015 | 1 | 0 |
| 2016 | 2 | 1 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 1 |
| 2020 | 0 | 0 |
| 2021 | 1 | 0 |
| 2022 | 0 | 1 |
| 2023 | 0 | 0 |
| 2024 | 0 | 1 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Process to optimize brown stock washing unit operations23 Dec 2025US 12,503,814 B2Ecolab USA Inc.
- Method for separating cellulose16 Feb 2021US 10,920,372 B2Earthrecycle Co., Ltd.
- On-site emulsification of defoamer for brownstock washing of pulp21 Jun 2016US 9,371,613 B1Solenis Technologies, L.P.
- Methods for the manufacture of cellulose nanocrystals29 Mar 2016US 9,297,111 B1Domtar Paper Company, LLC
- Method and assembly for processing cellulose pulp of wood processing industry20 Oct 2015US 9,163,358 B2Andritz Inc.
- Pressure diffuser lower bearing18 Jul 2024US 2024/0240401 A1Andritz Inc.
- Process to optimize brown stock washing unit operations11 Aug 2022US 2022/0251781 A1Ecolab USA Inc.
- Method for Separating Cellulose9 May 2019US 2019/0136448 A1Earthrecycle Co., Ltd.
- Method and assembly for processing cellulose pulp of wood processing industry11 Feb 2016US 2016/0040356 A1Andritz Inc.
- Pressure diffuser with an annular baffle screen plate over water inlet3 Jul 2014US 2014/0182802 A1Andritz Inc.
Most cited
By later US patents
- Method for steaming comminuted cellulosic fibrous material during continuous solvent pulping38US 5,865,948 AAlcell Technologies Inc. · 1999
- Peroxide bleach sequence including an acidic bleach stage and including a wash stage32US 6,605,181 B1Kvaerner Pulping Aktiebolag · 2003
- Apparatus for treating pulp produced by solvent pulping28US 5,681,427 AAlcell Technologies Inc. · 1997
- Stationary diffuser18US 4,468,319 A1984
- Effective diffuser/thickener screen backflushing13US 4,793,161 AKamyr, Inc. · 1988