D21C 9/06
In filters
Official title: in filters {; Washing of concentrated pulp, e.g. pulp mats, on filtering surfaces}
D21C9/06 (In filters) appears on 145 US grants and 59 published applications in this corpus.
Search patents in D21C- Granted patents
- 145
- Published applications
- 59
- Assignees
- 77
- Inventors
- 228
- Latest grant
- 23 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 2 | 0 |
| 1978 | 2 | 0 |
| 1979 | 2 | 0 |
| 1980 | 4 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 10 | 0 |
| 1986 | 4 | 0 |
| 1987 | 6 | 0 |
| 1988 | 4 | 0 |
| 1989 | 4 | 0 |
| 1990 | 8 | 0 |
| 1991 | 4 | 0 |
| 1992 | 2 | 0 |
| 1993 | 3 | 0 |
| 1994 | 3 | 0 |
| 1995 | 3 | 0 |
| 1996 | 4 | 0 |
| 1997 | 2 | 0 |
| 1998 | 5 | 0 |
| 1999 | 4 | 0 |
| 2000 | 5 | 0 |
| 2001 | 3 | 0 |
| 2002 | 3 | 2 |
| 2003 | 3 | 0 |
| 2004 | 0 | 0 |
| 2005 | 2 | 0 |
| 2006 | 0 | 2 |
| 2007 | 0 | 1 |
| 2008 | 1 | 5 |
| 2009 | 1 | 6 |
| 2010 | 3 | 8 |
| 2011 | 6 | 4 |
| 2012 | 7 | 1 |
| 2013 | 3 | 0 |
| 2014 | 2 | 2 |
| 2015 | 1 | 5 |
| 2016 | 2 | 3 |
| 2017 | 4 | 3 |
| 2018 | 2 | 1 |
| 2019 | 3 | 1 |
| 2020 | 0 | 1 |
| 2021 | 1 | 3 |
| 2022 | 1 | 4 |
| 2023 | 1 | 2 |
| 2024 | 3 | 1 |
| 2025 | 5 | 1 |
| 2026 | 0 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Process to optimize brown stock washing unit operations23 Dec 2025US 12,503,814 B2Ecolab USA Inc.
- Fiber wash system and method25 Nov 2025US 12,480,087 B2IntegroEnergy Group, Inc.
- Lignin removal from lignocellulosic waste using rejected brine solution30 Sep 2025US 12,428,783 B1United Arab Emirates University
- Method and arrangement for washer seal control17 Jun 2025US 12,331,835 B2Andritz Inc.
- Polymer coated paper recycling process and composition3 Jun 2025US 12,320,067 B2Nanocycle Tech Inc.
- Recycling of release liner glassine and sck into high quality pulp23 Jul 2026US 2026/0210041 A1Upm-Kymmene Corporation
- Manufacture of dissolving pulp grade cellulose25 Jun 2026US 2026/0176817 A1Sixring Inc.
- Fiber wash system and method19 Feb 2026US 2026/0049271 A1IntegroEnergy Group, Inc.
- Lignin removal from lignocellulosic waste using rejected brine solution2 Oct 2025US 2025/0305214 A1United Arab Emirates University
- Method for fractionation of highly refined cellulose2 May 2024US 2024/0141588 A1Stora Enso OYJ
Most cited
By later US patents
- Control system for controlling a pulp washing system using a neural network controller95US 5,282,131 ABrown and Root Industrial Services, Inc. · 1994
- Use of polymers in the recycled fiber washing/deinking process92US 5,626,718 ABetz Laboratories, Inc. · 1997
- Process for treating a slurry of cellulosic material45US 4,046,621 ACanadian International Paper Company · 1977
- Method for countercurrent treatment of slurries31US 6,228,215 B1Hoffman Enviornmental Systems, Inc. · 2001
- Process for treating a slurry of cellulosic material29US 4,014,736 ACanadian International Paper Company · 1977