D21C 11/125
Decomposition of the pulp liquors in reducing atmosphere or in the absence
Official title: {Decomposition of the pulp liquors in reducing atmosphere or in the absence of oxidants, i.e. gasification or pyrolysis}
D21C11/125 (Decomposition of the pulp liquors in reducing atmosphere or in the absence) appears on 78 US grants and 32 published applications in this corpus.
Search patents in D21C- Granted patents
- 78
- Published applications
- 32
- Assignees
- 53
- Inventors
- 148
- Latest grant
- 18 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 3 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 3 | 0 |
| 1995 | 1 | 0 |
| 1996 | 3 | 0 |
| 1997 | 6 | 0 |
| 1998 | 6 | 0 |
| 1999 | 6 | 0 |
| 2000 | 7 | 0 |
| 2001 | 3 | 1 |
| 2002 | 3 | 1 |
| 2003 | 0 | 0 |
| 2004 | 4 | 3 |
| 2005 | 1 | 2 |
| 2006 | 0 | 2 |
| 2007 | 2 | 1 |
| 2008 | 1 | 0 |
| 2009 | 1 | 1 |
| 2010 | 1 | 0 |
| 2011 | 1 | 3 |
| 2012 | 0 | 3 |
| 2013 | 1 | 1 |
| 2014 | 1 | 0 |
| 2015 | 1 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 2 |
| 2018 | 0 | 2 |
| 2019 | 3 | 2 |
| 2020 | 0 | 0 |
| 2021 | 2 | 2 |
| 2022 | 1 | 2 |
| 2023 | 1 | 2 |
| 2024 | 4 | 2 |
| 2025 | 2 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Method for the gasification of a black liquor18 Nov 2025US 12,473,689 B2Commissariat A L' Energie Atomique Et Aux Energies Alternatives
- Cellulose based biodegradable absorptive filter and method of making15 Apr 2025US 12,274,964 B1Imam Mohammad Ibn Saud Islamic University
- Method for making an adsorptive air filter24 Dec 2024US 12,172,112 B1Imam Mohammad Ibn Saud Islamic University
- Biodegradable air filter from date palm and method of fabrication thereof1 Oct 2024US 12,102,947 B1Imam Mohammad Ibn Saud Islamic University
- Process for manufacturing an upgraded bio-oil from black liquor23 Jul 2024US 12,043,957 B2Huntsman International LLC
- Treating black liquor with acidic biomass for lignin recovery21 Nov 2024US 2024/0383937 A1SunCarbon AB
- Systems and techniques for controlling odor emissions from pulp mills21 Nov 2024US 2024/0384467 A1Ecolab USA Inc.
- Method for the gasification of a black liquor28 Dec 2023US 2023/0416986 A1Commissariat A L' Energie Atomique Et Aux Energies Alternatives
- Process for refining fiber and deriving chemical co-products from biomass13 Jul 2023US 2023/0220622 A1Circular Systems S.P.C.
- A process for manufacturing an upgraded bio-oil from black liquor15 Sep 2022US 2022/0290370 A1Huntsman International LLC
Most cited
By later US patents
- Indirectly heated thermochemical reactor apparatus and processes143US 5,059,404 AManufacturing and Technology Conversion International, Inc. · 1991
- Process for detoxifying waste materials by steam reformation through endothermic gasification reactions104US 6,149,765 AManufacturing and Technology Conversion International, Inc. · 2000
- Indirectly heated thermochemical reactor apparatus and processes101US 5,306,481 AManufacturing and Technology Conversion International, Inc. · 1994
- Process for oxygen pulping of lignocellulosic material and recorvery of pulping chemicals96US 6,770,168 B1Kiram AB · 2004
- Endothermic spent liquor recovery process89US 5,637,192 AManufacturing and Technology Conversion International, Inc. · 1997