D21C 11/0064
Aspects concerning the production and the treatment of green and white liquors
Official title: {Aspects concerning the production and the treatment of green and white liquors, e.g. causticizing green liquor}
D21C11/0064 (Aspects concerning the production and the treatment of green and white liquors) appears on 141 US grants and 78 published applications in this corpus.
Search patents in D21C- Granted patents
- 141
- Published applications
- 78
- Assignees
- 85
- Inventors
- 259
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 3 | 0 |
| 1980 | 1 | 0 |
| 1981 | 4 | 0 |
| 1982 | 3 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 2 | 0 |
| 1989 | 4 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 3 | 0 |
| 1993 | 3 | 0 |
| 1994 | 3 | 0 |
| 1995 | 2 | 0 |
| 1996 | 10 | 0 |
| 1997 | 9 | 0 |
| 1998 | 5 | 0 |
| 1999 | 5 | 0 |
| 2000 | 6 | 0 |
| 2001 | 5 | 1 |
| 2002 | 2 | 5 |
| 2003 | 3 | 3 |
| 2004 | 2 | 1 |
| 2005 | 0 | 3 |
| 2006 | 0 | 2 |
| 2007 | 4 | 4 |
| 2008 | 1 | 1 |
| 2009 | 2 | 2 |
| 2010 | 1 | 1 |
| 2011 | 1 | 3 |
| 2012 | 1 | 2 |
| 2013 | 2 | 2 |
| 2014 | 3 | 6 |
| 2015 | 3 | 4 |
| 2016 | 1 | 4 |
| 2017 | 4 | 4 |
| 2018 | 5 | 4 |
| 2019 | 4 | 4 |
| 2020 | 4 | 4 |
| 2021 | 3 | 4 |
| 2022 | 2 | 4 |
| 2023 | 3 | 2 |
| 2024 | 4 | 3 |
| 2025 | 1 | 2 |
| 2026 | 3 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Predictive and real time process intervention involving a multi-component defoamer feed unit18 Aug 2026US 12,709,840 B2Buckman Laboratories International, Inc.
- Device and method for treating green liquor11 Aug 2026US 12,703,943 B2Valmet Corporation
- Recovering a caustic solution via calcium carbonate crystal aggregates24 Mar 2026US 12,583,756 B2Carbon Engineering ULC
- 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
- Method and a system for producing an oil rich fraction from biomass22 Oct 2024US 12,123,137 B2Valmet Technologies Oy
- Recovering a caustic solution via calcium carbonate crystal aggregates10 Sep 2026US 2026/0265074 A1Carbon Engineering ULC
- A method for removing non-process elements in a kraft pulping process9 Jul 2026US 2026/0193840 A1Valmet Corporation
- Method for processing black liquor in pulp production12 Feb 2026US 2026/0043196 A1Chung Hwa Pulp Corporation
- Predictive and real time process intervention involving a multi-component defoamer feed unit5 Jun 2025US 2025/0179733 A1Buckman Laboratories International, Inc.
- Recovering a caustic solution via calcium carbonate crystal aggregates2 Jan 2025US 2025/0002364 A1Carbon Engineering ULC
Most cited
By later US patents
- Process for controlling the efficiency of the causticizing process46US 5,822,220 AFisher-Rosemount Systems, Inc. · 1998
- Determination of sodium sulfide and sulfidity in green liquors and smelt solutions34US 5,616,214 APulp and Paper Research Institute of Canada · 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
- Recausticizing kraft green liquor23US 4,668,342 ACanadian Patents and Development Limited · 1987
- Methods for recovery and recycling of chemicals from sodium sulfite and sodium bisulfite pulping operations17US 4,148,684 AMEI Systems Inc. · 1979