D21C 11/0042
Fractionating or concentration of spent liquors by special methods
Official title: {Fractionating or concentration of spent liquors by special methods (concentration by evaporation D21C11/10)}
D21C11/0042 (Fractionating or concentration of spent liquors by special methods) appears on 91 US grants and 91 published applications in this corpus.
Search patents in D21C- Granted patents
- 91
- Published applications
- 91
- Assignees
- 77
- Inventors
- 240
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 3 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 3 | 0 |
| 1995 | 0 | 0 |
| 1996 | 4 | 0 |
| 1997 | 3 | 0 |
| 1998 | 5 | 0 |
| 1999 | 4 | 0 |
| 2000 | 4 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 4 |
| 2003 | 0 | 0 |
| 2004 | 1 | 2 |
| 2005 | 1 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 1 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 1 | 0 |
| 2011 | 0 | 2 |
| 2012 | 0 | 2 |
| 2013 | 2 | 0 |
| 2014 | 2 | 4 |
| 2015 | 2 | 9 |
| 2016 | 1 | 8 |
| 2017 | 5 | 9 |
| 2018 | 3 | 3 |
| 2019 | 7 | 5 |
| 2020 | 1 | 5 |
| 2021 | 6 | 4 |
| 2022 | 5 | 11 |
| 2023 | 3 | 8 |
| 2024 | 6 | 5 |
| 2025 | 6 | 4 |
| 2026 | 3 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method for fractionation of highly refined cellulose6 Oct 2026US 12,753,551 B2Stora Enso OYJ
- Dewatering viscous liquids with pressurized carbon dioxide3 Mar 2026US 12,564,807 B2Auburn University
- Method for processing bark press water from sawmills and/or pulp mills17 Feb 2026US 12,553,181 B2SöDra SkogsäGarna Ekonomisk FöRening
- Efficient methods and compositions for recovery of products from organic acid pretreatment of plant materials25 Nov 2025US 12,480,255 B2Pierson Capital Environmental (Beijing) Limited
- Method for the gasification of a black liquor18 Nov 2025US 12,473,689 B2Commissariat A L' Energie Atomique Et Aux Energies Alternatives
- A method for recovering lignin microparticles from spent pulping liquor, a method for preparing carbonized lignin, lignin microparticles, a coating composition, a resin, an electrochemical energy storage device carbonized lignin microparticles, and use of the lignin microparticles and the carbonized lignin microparticles13 Aug 2026US 2026/0234867 A1Teknologian tutkimuskeskus VTT Oy
- Method for separating at least one lignin fraction, lignin derivatives, low-molecular carboxylic acids, inorganic salt, or a mixture thereof from filtrates originating from a kraft process9 Jul 2026US 2026/0193839 A1Mondi AG
- Systems and methods for processing black liquor solutions18 Jun 2026US 2026/0168171 A1
- Efficient methods and compositions for recovery of products from organic acid pretreatment of plant materials6 Nov 2025US 2025/0341054 A1Pierson Capital Environmental (Beijing) Limited
- Process for production of lignin, organic acids, organic chemicals, pure co2, and water from kraft black liquor with operational efficiencies14 Aug 2025US 2025/0257526 A1Georgia Tech Research Corporation
Most cited
By later US patents
- Recovery of lignin112US 4,764,596 ARepap Technologies Inc. · 1988
- Method for fractionating a solution57US 5,730,877 AXyrofin Oy · 1998
- Method for fractionating sulphite cooking liquor49US 5,637,225 AXyrofin Oy · 1997
- Method for the simultaneous delignification of wood and other ligno-cellulosic materials and hydrolysis of the hemicellulose component thereof35US 4,511,433 ABattelle Memorial Institute · 1985
- Electrodialylic water splitting process for the treatment of aqueous electrolytes19US 5,006,211 APulp and Paper Research Institute of Canada · 1991