D21C 11/0028
Effluents derived from the washing or bleaching plants
Official title: {Effluents derived from the washing or bleaching plants}
D21C11/0028 (Effluents derived from the washing or bleaching plants) appears on 62 US grants and 25 published applications in this corpus.
Search patents in D21C- Granted patents
- 62
- Published applications
- 25
- Assignees
- 34
- Inventors
- 101
- Latest grant
- 12 May 2020
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 2 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 4 | 0 |
| 1995 | 2 | 0 |
| 1996 | 6 | 0 |
| 1997 | 5 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 3 | 0 |
| 2001 | 3 | 0 |
| 2002 | 2 | 2 |
| 2003 | 1 | 3 |
| 2004 | 3 | 1 |
| 2005 | 1 | 0 |
| 2006 | 0 | 1 |
| 2007 | 2 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 3 |
| 2011 | 0 | 1 |
| 2012 | 0 | 1 |
| 2013 | 1 | 0 |
| 2014 | 3 | 1 |
| 2015 | 2 | 7 |
| 2016 | 5 | 3 |
| 2017 | 3 | 0 |
| 2018 | 0 | 1 |
| 2019 | 0 | 0 |
| 2020 | 1 | 0 |
| 2021 | 0 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Methods of processing plant fiber, and related systems and compositions12 May 2020US 10,648,131 B2POET Research, Inc.
- Biomass treatment for hyperthermal hydrocatalytic conversion18 Jul 2017US 9,708,763 B2Shell Oil Company
- Biomass treatment for hydrothermal hydrocatalytic conversion18 Jul 2017US 9,708,764 B2Shell Oil Company
- Biomass treatment for hydrothermal hydrocatalytic conversion14 Mar 2017US 9,593,448 B2Shell Oil Company
- Biomass treatment for hydrothermal hydrocatalytic conversion2 Aug 2016US 9,404,217 B2Shell Oil Company
- Method of producing dissolving pulp11 Feb 2021US 2021/0040688 A1Andritz Inc.
- Method for optimising material recovery in a chemical pulping process8 Nov 2018US 2018/0319682 A1Kemira Oyj
- Biomass treatment for hydrothermal hydrocatalytic conversion20 Oct 2016US 2016/0305068 A1Shell Oil Company
- Biomass treatment for hyperthermal hydrocatalytic conversion13 Oct 2016US 2016/0298293 A1Shell Oil Company
- Method and assembly for processing cellulose pulp of wood processing industry11 Feb 2016US 2016/0040356 A1Andritz Inc.
Most cited
By later US patents
- Kraft pulp bleaching and recovery process24US 4,196,043 AScott Paper Company · 1980
- Process for recycling bleach plant filtrate22US 5,352,332 A1994
- Bleach plant filtrate recovery21US 4,039,372 AErco Envirotech Ltd. · 1977
- Removal of AOX FRM bleach plant mill effluents by pH shift using the alkalinity/acidity sources available at the mill16US 5,120,448 A1992
- Membrane separation process14US 4,995,983 AMacMillan Bloedel Limited · 1991