D21C 11/0092
Substances modifying the evaporation, combustion, or thermal decomposition processes of black liquor
Official title: {Substances modifying the evaporation, combustion, or thermal decomposition processes of black liquor (treatment of solid substances (ash) separated from combustion gases D21C11/066; avoiding scale-forming during evaporation D21C11/106)}
D21C11/0092 (Substances modifying the evaporation, combustion, or thermal decomposition processes of black liquor) appears on 25 US grants and 10 published applications in this corpus.
Search patents in D21C- Granted patents
- 25
- Published applications
- 10
- Assignees
- 19
- Inventors
- 64
- Latest grant
- 18 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 3 | 0 |
| 1998 | 0 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 1 |
| 2014 | 0 | 0 |
| 2015 | 1 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 1 |
| 2018 | 0 | 1 |
| 2019 | 1 | 1 |
| 2020 | 0 | 1 |
| 2021 | 2 | 2 |
| 2022 | 0 | 0 |
| 2023 | 0 | 1 |
| 2024 | 1 | 2 |
| 2025 | 2 | 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
- Black liquor viscosity reducing and anti-scale agent17 Jun 2025US 12,331,461 B2Ecolab USA Inc.
- Black liquor viscosity reducing and anti-scale agent20 Feb 2024US 11,905,655 B2Ecolab USA Inc.
- Deposit control for a black liquor recovery boiler18 May 2021US 11,008,704 B2
- Process for the preparation of aromatic compounds23 Feb 2021US 10,927,498 B2Huntsman International LLC
- Black liquor treatment9 May 2024US 2024/0150960 A1Solenis Technologies, L.P.
- Black liquor viscosity reducing and anti-scale agent9 May 2024US 2024/0150961 A1Ecolab USA Inc.
- Method for the gasification of a black liquor28 Dec 2023US 2023/0416986 A1Commissariat A L' Energie Atomique Et Aux Energies Alternatives
- Black liquor viscosity reducing and anti-scale agent4 Mar 2021US 2021/0062421 A1Ecolab USA Inc.
- Kraft pulp mill scale control with end group modified polycarboxylates7 Jan 2021US 2021/0002826 A1Solenis Technologies, L.P.
Most cited
By later US patents
- Fluidized bed reactor system69US 4,311,670 AA. Ahlstrom Osakeyhtio · 1982
- Pollution free pulping process using recycled wash effluent from multiple bleach stages to remove black liquor and recovering sodium hydroxide from the black liquor35US 4,619,733 A1986
- Defoamer composition and method of using the same28US 5,645,762 AHenkel Corporation · 1997
- Method of treating spent pulping liquor in a fluidized bed reactor17US 4,244,779 AA. Ahlstrom Osakeyhtio · 1981
- Process and apparatus for recovery of spent pulping liquors14US 4,303,469 AInternational Paper Company · 1981