D21C 3/24
Continuous processes
D21C3/24 (Continuous processes) appears on 148 US grants and 96 published applications in this corpus.
Search patents in D21C- Granted patents
- 148
- Published applications
- 96
- Assignees
- 43
- Inventors
- 177
- Latest grant
- 4 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 3 | 0 |
| 1995 | 4 | 0 |
| 1996 | 8 | 0 |
| 1997 | 12 | 0 |
| 1998 | 7 | 0 |
| 1999 | 7 | 0 |
| 2000 | 14 | 0 |
| 2001 | 8 | 3 |
| 2002 | 3 | 4 |
| 2003 | 1 | 3 |
| 2004 | 1 | 8 |
| 2005 | 2 | 8 |
| 2006 | 2 | 2 |
| 2007 | 6 | 8 |
| 2008 | 5 | 5 |
| 2009 | 6 | 5 |
| 2010 | 6 | 6 |
| 2011 | 4 | 9 |
| 2012 | 2 | 3 |
| 2013 | 6 | 2 |
| 2014 | 12 | 5 |
| 2015 | 2 | 2 |
| 2016 | 2 | 1 |
| 2017 | 3 | 7 |
| 2018 | 3 | 0 |
| 2019 | 1 | 4 |
| 2020 | 1 | 1 |
| 2021 | 2 | 3 |
| 2022 | 2 | 2 |
| 2023 | 1 | 1 |
| 2024 | 2 | 0 |
| 2025 | 0 | 3 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Optimization of chemical consumption in biomass delignification4 Aug 2026US 12,698,589 B2Sixring Inc.
- Method for producing combustible pellets by improved steam cracking using heterogeneous biomass20 Jan 2026US 12,529,002 B2Europeenne De Biomasse
- Predictive control system and method for brown washing treatment in pulp mills3 Sep 2024US 12,077,911 B2Buckman Laboratories International, Inc.
- Method of feeding wood chips to a prehydrolysis reactor28 May 2024US 11,993,895 B2Andritz Inc.
- Method of transforming high consistency pulp fibers into pre-dispersed semi-dry and dry fibrous materials5 Dec 2023US 11,834,785 B2FPInnovations
- Recycling of release liner glassine and sck into high quality pulp23 Jul 2026US 2026/0210041 A1Upm-Kymmene Corporation
- Use of cellulase to improve viscosity control of kraft dissolving pulp9 Oct 2025US 2025/0314012 A1Novozymes A/S
- Apparatus for processing fibrous materials18 Sep 2025US 2025/0290251 A1Voith Patent GmbH
- Optimization of chemical consumption in biomass delignification13 Feb 2025US 2025/0052002 A1Sixring Inc.
- Method for producing combustible pellets by improved steam cracking using heterogeneous biomass22 Jun 2023US 2023/0193149 A1Europeenne De Biomasse
Most cited
By later US patents
- Delignification of non-woody biomass40US 5,023,097 AXylan Corporation · 1991
- Chip feeding for a continuous digester38US 5,476,572 AKamyr, Inc. · 1995
- Method for steaming comminuted cellulosic fibrous material during continuous solvent pulping38US 5,865,948 AAlcell Technologies Inc. · 1999
- Delignification of non-woody biomass29US 4,842,877 AXylan Corporation · 1989
- Apparatus for treating pulp produced by solvent pulping28US 5,681,427 AAlcell Technologies Inc. · 1997