D21C 11/0007
Recovery of by-products, i.e. compounds other than those necessary for pulping, for
Official title: {Recovery of by-products, i.e. compounds other than those necessary for pulping, for multiple uses or not otherwise provided for (volatile compounds obtained by decomposition of spent liquors in order to regenerate them D21C11/125; compounds obtained by fractionating the liquors in order to regenerate them D21C11/0042)}
D21C11/0007 (Recovery of by-products, i.e. compounds other than those necessary for pulping, for) appears on 411 US grants and 549 published applications in this corpus.
Search patents in D21C- Granted patents
- 411
- Published applications
- 549
- Assignees
- 289
- Inventors
- 984
- Latest grant
- 4 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 3 | 0 |
| 1979 | 2 | 0 |
| 1980 | 2 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 5 | 0 |
| 1995 | 3 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 6 | 0 |
| 1999 | 3 | 0 |
| 2000 | 3 | 0 |
| 2001 | 1 | 1 |
| 2002 | 3 | 10 |
| 2003 | 5 | 6 |
| 2004 | 2 | 4 |
| 2005 | 2 | 4 |
| 2006 | 2 | 2 |
| 2007 | 2 | 7 |
| 2008 | 2 | 16 |
| 2009 | 4 | 21 |
| 2010 | 8 | 33 |
| 2011 | 9 | 23 |
| 2012 | 20 | 28 |
| 2013 | 24 | 26 |
| 2014 | 19 | 41 |
| 2015 | 30 | 39 |
| 2016 | 25 | 47 |
| 2017 | 24 | 38 |
| 2018 | 25 | 17 |
| 2019 | 22 | 34 |
| 2020 | 18 | 23 |
| 2021 | 34 | 31 |
| 2022 | 15 | 27 |
| 2023 | 16 | 29 |
| 2024 | 24 | 19 |
| 2025 | 24 | 15 |
| 2026 | 8 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- 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 materials14 Jul 2026US 12,678,759 B2Circ, LLC
- Process and system for producing pulp, energy, and bioderivatives from plant-based and recycled materials28 Apr 2026US 12,611,644 B2Circ, LLC
- High yield cooking method14 Apr 2026US 12,601,114 B2AMPPC Finland Oy
- Dewatering viscous liquids with pressurized carbon dioxide3 Mar 2026US 12,564,807 B2Auburn University
- Process and System for Producing Pulp, Energy, and Bioderivatives from Plant-Based and Recycled Materials10 Sep 2026US 2026/0264040 A1Circ, LLC
- 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
- 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
- Filtration apparatus containing graphene oxide membrane25 Jun 2026US 2026/0175179 A1Via Separations, Inc.
Most cited
By later US patents
- Recovery of lignin112US 4,764,596 ARepap Technologies Inc. · 1988
- Method of separating lignocellulosic material into lignin, cellulose and dissolved sugars88US 5,730,837 AMidwest Research Institute · 1998
- Lyocell film made from cellulose having low degree of polymerization values80US 6,440,547 B1Weyerhaeuser Company · 2002
- Lyocell fibers, and compositions for making the same77US 6,471,727 B2Weyerhaeuser Company · 2002
- Process for making lyocell fibers from pulp having low average degree of polymerization values72US 6,706,237 B2Weyerhaeuser Company · 2004