D21C 11/06
Treatment of pulp gases
Official title: Treatment of pulp gases; Recovery of the heat content of the gases; {Treatment of gases arising from various sources in pulp and paper mills; Regeneration of gaseous SO2, e.g. arising from liquors containing sulfur compounds}
D21C11/06 (Treatment of pulp gases) appears on 187 US grants and 84 published applications in this corpus.
Search patents in D21C- Granted patents
- 187
- Published applications
- 84
- Assignees
- 105
- Inventors
- 365
- Latest grant
- 14 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 3 | 0 |
| 1978 | 1 | 0 |
| 1979 | 3 | 0 |
| 1980 | 4 | 0 |
| 1981 | 3 | 0 |
| 1982 | 2 | 0 |
| 1983 | 4 | 0 |
| 1984 | 2 | 0 |
| 1985 | 4 | 0 |
| 1986 | 3 | 0 |
| 1987 | 4 | 0 |
| 1988 | 1 | 0 |
| 1989 | 3 | 0 |
| 1990 | 3 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 5 | 0 |
| 1994 | 6 | 0 |
| 1995 | 6 | 0 |
| 1996 | 7 | 0 |
| 1997 | 10 | 0 |
| 1998 | 8 | 0 |
| 1999 | 15 | 0 |
| 2000 | 8 | 0 |
| 2001 | 9 | 1 |
| 2002 | 4 | 1 |
| 2003 | 2 | 2 |
| 2004 | 5 | 2 |
| 2005 | 0 | 1 |
| 2006 | 1 | 1 |
| 2007 | 0 | 5 |
| 2008 | 1 | 2 |
| 2009 | 2 | 1 |
| 2010 | 2 | 6 |
| 2011 | 1 | 7 |
| 2012 | 3 | 2 |
| 2013 | 3 | 2 |
| 2014 | 4 | 3 |
| 2015 | 6 | 2 |
| 2016 | 3 | 5 |
| 2017 | 3 | 0 |
| 2018 | 2 | 5 |
| 2019 | 3 | 6 |
| 2020 | 4 | 6 |
| 2021 | 3 | 2 |
| 2022 | 3 | 6 |
| 2023 | 5 | 6 |
| 2024 | 2 | 6 |
| 2025 | 5 | 1 |
| 2026 | 3 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- System and method for the removal of non-process elements from electrostatic precipitator ashes in a kraft pulp process14 Jul 2026US 12,680,228 B2L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Centralized control of multiple sorting facilities14 Apr 2026US 12,599,914 B2AMP Robotics Corporation
- Reconfigurable sorting facility24 Feb 2026US 12,558,695 B2AMP Robotics Corporation
- Method of removing volatile compounds from a lignin-containing material, use of a distillation method, and a lignin-containing material25 Nov 2025US 12,479,876 B2Andritz Inc.
- Kraft pulping foul condensate treatment process and apparatus15 Jul 2025US 12,358,813 B2Noram Engineering and Constructors Ltd.
- Centralized control of multiple sorting facilities25 Jun 2026US 2026/0176818 A1AMP Robotics Corporation
- System and Process for Reducing Chemical Losses in Treating Ash Produced in a Recovery Boiler of a Wood Pulping Process12 Feb 2026US 2026/0042676 A1Veolia Water Technologies, Inc.
- Reconfigurable sorting facility22 Jan 2026US 2026/0021491 A1AMP Robotics Corporation
- Method For Odor Reduction Of Particulate Carbon Materials16 Oct 2025US 2025/0320122 A1Suncoal Industries GmbH
- Systems and techniques for controlling odor emissions from pulp mills21 Nov 2024US 2024/0384467 A1Ecolab USA Inc.
Most cited
By later US patents
- Black liquor gasifier51US 5,752,994 AThe Babcock & Wilcox Company · 1998
- Electromembrane processes for the treatment of kraft mill electrostatic precipitator catch38US 5,567,293 APulp and Paper Research Institute of Canada · 1996
- Process for chemicals and energy recovery from waste liquors36US 4,808,264 A1989
- Method for removing odor from fluid33US 4,225,381 AOji Paper Co., Ltd. · 1980
- Method of removing sulfur from a process gas stream using a packed bed calcinator32US 6,136,144 AThermatrix, Inc. · 2000