D21C 11/0057
Oxidation of liquors
Official title: {Oxidation of liquors, e.g. in order to reduce the losses of sulfur compounds, followed by evaporation or combustion if the liquor in question is a black liquor (deodorisation of gases D21C11/08; combustion D21C11/12, D21C11/14)}
D21C11/0057 (Oxidation of liquors) appears on 67 US grants and 43 published applications in this corpus.
Search patents in D21C- Granted patents
- 67
- Published applications
- 43
- Assignees
- 56
- Inventors
- 176
- Latest grant
- 18 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 3 | 0 |
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 3 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 3 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 3 | 0 |
| 1996 | 2 | 0 |
| 1997 | 3 | 0 |
| 1998 | 1 | 0 |
| 1999 | 3 | 0 |
| 2000 | 2 | 0 |
| 2001 | 2 | 0 |
| 2002 | 0 | 3 |
| 2003 | 2 | 1 |
| 2004 | 2 | 2 |
| 2005 | 0 | 1 |
| 2006 | 0 | 1 |
| 2007 | 1 | 0 |
| 2008 | 1 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 0 |
| 2011 | 1 | 1 |
| 2012 | 0 | 1 |
| 2013 | 1 | 0 |
| 2014 | 1 | 3 |
| 2015 | 4 | 4 |
| 2016 | 0 | 3 |
| 2017 | 0 | 0 |
| 2018 | 1 | 1 |
| 2019 | 1 | 3 |
| 2020 | 1 | 3 |
| 2021 | 3 | 5 |
| 2022 | 2 | 2 |
| 2023 | 5 | 5 |
| 2024 | 2 | 3 |
| 2025 | 4 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Method for the gasification of a black liquor18 Nov 2025US 12,473,689 B2Commissariat A L' Energie Atomique Et Aux Energies Alternatives
- Process and apparatus for white liquor oxidation9 Sep 2025US 12,410,557 B2Messer Austria GmbH
- Method of replacing sodium losses in a pulp mill, a method of producing bleached cellulosic pulp, and a system17 Jun 2025US 12,331,460 B2Metsa Fibre Oy
- High solids alkaline oxidation and biomethane conversion of residual lignin25 Feb 2025US 12,234,603 B2
- Method for producing oxidized lignin in kraft pulp mill6 Aug 2024US 12,054,886 B2Andritz Inc.
- Systems and techniques for controlling odor emissions from pulp mills21 Nov 2024US 2024/0384467 A1Ecolab USA Inc.
- Sulfonated Lignin-Derived Compounds And Uses Thereof26 Sep 2024US 2024/0318382 A1CMBlu Energy AG
- Black liquor treatment9 May 2024US 2024/0150960 A1Solenis Technologies, L.P.
- Method for the gasification of a black liquor28 Dec 2023US 2023/0416986 A1Commissariat A L' Energie Atomique Et Aux Energies Alternatives
- Process and apparatus for white liquor oxidation5 Oct 2023US 2023/0313456 A1Messer Austria GmbH
Most cited
By later US patents
- Process for oxygen pulping of lignocellulosic material and recorvery of pulping chemicals96US 6,770,168 B1Kiram AB · 2004
- Production of pulp by the soda-anthraquinone process (SAP) with recovery of the cooking chemicals77US 5,595,628 AGrant S.A. · 1997
- Process of producing kraft pulping liquor by the oxidation of white liquor in the presence of lime mud32US 5,082,526 APulp and Paper Research Institute of Canada · 1992
- Method of removing sulfur from a process gas stream using a packed bed calcinator32US 6,136,144 AThermatrix, Inc. · 2000
- Process for production of activated carbon spheres29US 4,045,368 AKureha Kagaku Kogyo Kabushiki Kaisha · 1977