D21C 11/00
Regeneration of pulp liquors or effluent waste waters
Official title: Regeneration of pulp liquors {or effluent waste waters}
D21C11/00 (Regeneration of pulp liquors or effluent waste waters) appears on 1,189 US grants and 916 published applications in this corpus.
Search patents in D21C- Granted patents
- 1,189
- Published applications
- 916
- Assignees
- 592
- Inventors
- 2,238
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 14 | 0 |
| 1977 | 16 | 0 |
| 1978 | 16 | 0 |
| 1979 | 16 | 0 |
| 1980 | 18 | 0 |
| 1981 | 14 | 0 |
| 1982 | 15 | 0 |
| 1983 | 8 | 0 |
| 1984 | 12 | 0 |
| 1985 | 17 | 0 |
| 1986 | 10 | 0 |
| 1987 | 16 | 0 |
| 1988 | 22 | 0 |
| 1989 | 11 | 0 |
| 1990 | 17 | 0 |
| 1991 | 13 | 0 |
| 1992 | 18 | 0 |
| 1993 | 14 | 0 |
| 1994 | 20 | 0 |
| 1995 | 26 | 0 |
| 1996 | 32 | 0 |
| 1997 | 44 | 0 |
| 1998 | 36 | 0 |
| 1999 | 36 | 0 |
| 2000 | 33 | 0 |
| 2001 | 34 | 6 |
| 2002 | 21 | 27 |
| 2003 | 13 | 17 |
| 2004 | 22 | 21 |
| 2005 | 10 | 19 |
| 2006 | 4 | 17 |
| 2007 | 12 | 21 |
| 2008 | 9 | 24 |
| 2009 | 12 | 34 |
| 2010 | 17 | 51 |
| 2011 | 23 | 43 |
| 2012 | 30 | 43 |
| 2013 | 37 | 35 |
| 2014 | 40 | 55 |
| 2015 | 45 | 62 |
| 2016 | 37 | 61 |
| 2017 | 40 | 53 |
| 2018 | 38 | 32 |
| 2019 | 35 | 50 |
| 2020 | 28 | 34 |
| 2021 | 44 | 50 |
| 2022 | 28 | 45 |
| 2023 | 29 | 43 |
| 2024 | 32 | 37 |
| 2025 | 37 | 20 |
| 2026 | 18 | 16 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- D21C 11/0007Recovery of by-products, i.e. compounds other than those necessary for pulping, for411
- D21C 11/12Combustion of pulp liquors288
- D21C 11/06Treatment of pulp gases187
- D21C 11/0064Aspects concerning the production and the treatment of green and white liquors141
- D21C 11/10Concentrating spent liquor by evaporation138
- D21C 11/0021Introduction of various effluents113
- D21C 11/04Regeneration of pulp liquors or effluent waste waters: of alkali lye101
- D21C 11/0042Fractionating or concentration of spent liquors by special methods91
All 13 subgroupsShow fewer
- D21C 11/0057Oxidation of liquors67
- D21C 11/0085Introduction of auxiliary substances into the regenerating system in order to improve59
- D21C 11/0014Combination of various pulping processes with one or several recovery systems22
- D21C 11/0035Introduction of compounds16
- D21C 11/02Regeneration of pulp liquors or effluent waste waters: of acid, neutral or14
Recent patents
- Method for fractionation of highly refined cellulose6 Oct 2026US 12,753,551 B2Stora Enso OYJ
- Cooling shield for a liquor injection pipe of a liquor gun, liquor gun system comprising the cooling shield, and method for cooling a liquor injection pipe in a liquor gun system15 Sep 2026US 12,736,217 B2Valmet Corporation
- 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
- Processes for fractionation of biomass4 Aug 2026US 12,698,590 B2The Board of Trustees of The University of Alabama
- Process and System for Producing Pulp, Energy, and Bioderivatives from Plant-Based and Recycled Materials10 Sep 2026US 2026/0264040 A1Circ, LLC
- Recovering a caustic solution via calcium carbonate crystal aggregates10 Sep 2026US 2026/0265074 A1Carbon Engineering ULC
- Calcination reactor arrangement, calcination system and calcination method20 Aug 2026US 2026/0241355 A1Limearc Process AB
- 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
- Fractionation of crude tall oil16 Jul 2026US 2026/0201271 A1Stora Enso OYJ
Most cited
By later US patents
- Plasma whirl reactor apparatus and methods of use164US 7,622,693 B2Foret Plasma Labs, LLC · 2009
- Indirectly heated thermochemical reactor apparatus and processes143US 5,059,404 AManufacturing and Technology Conversion International, Inc. · 1991
- Recovery of lignin112US 4,764,596 ARepap Technologies Inc. · 1988
- 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