D21C 11/0085
Introduction of auxiliary substances into the regenerating system in order to improve
Official title: {Introduction of auxiliary substances into the regenerating system in order to improve the performance of certain steps of the latter, the presence of these substances being confined to the regeneration cycle (introduction of compounds in order to make up for the losses of pulping agents D21C11/0035; conventional causticizing of green liquors D21C11/0064; fractionating of spent liquors D21C11/0042)}
D21C11/0085 (Introduction of auxiliary substances into the regenerating system in order to improve) appears on 59 US grants and 37 published applications in this corpus.
Search patents in D21C- Granted patents
- 59
- Published applications
- 37
- Assignees
- 51
- Inventors
- 174
- Latest grant
- 31 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 5 | 0 |
| 1997 | 5 | 0 |
| 1998 | 0 | 0 |
| 1999 | 3 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 2 |
| 2003 | 1 | 0 |
| 2004 | 1 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 1 | 0 |
| 2011 | 0 | 1 |
| 2012 | 0 | 1 |
| 2013 | 0 | 2 |
| 2014 | 1 | 1 |
| 2015 | 3 | 0 |
| 2016 | 2 | 6 |
| 2017 | 2 | 4 |
| 2018 | 3 | 2 |
| 2019 | 1 | 2 |
| 2020 | 2 | 2 |
| 2021 | 3 | 4 |
| 2022 | 1 | 0 |
| 2023 | 0 | 4 |
| 2024 | 1 | 4 |
| 2025 | 3 | 0 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Paper and pulp foam control agent31 Mar 2026US 12,590,414 B2Dow Global Technologies LLC
- Method for the gasification of a black liquor18 Nov 2025US 12,473,689 B2Commissariat A L' Energie Atomique Et Aux Energies Alternatives
- Black liquor viscosity reducing and anti-scale agent17 Jun 2025US 12,331,461 B2Ecolab USA Inc.
- Antifoam compositions comprising branched siloxanes formed by treating linear siloxanes with high-energy radiation10 Jun 2025US 12,325,773 B2Wacker Chemie AG
- Black liquor viscosity reducing and anti-scale agent20 Feb 2024US 11,905,655 B2Ecolab USA Inc.
- Method for processing black liquor in pulp production12 Feb 2026US 2026/0043196 A1Chung Hwa Pulp Corporation
- Defoaming agent and compositions containing the defoaming agent28 Nov 2024US 2024/0390820 A1Solenis Technologies, L.P.
- Scale inhibition for pulp digesters25 Jul 2024US 2024/0247439 A1Ecolab USA Inc.
- Black liquor treatment9 May 2024US 2024/0150960 A1Solenis Technologies, L.P.
- Black liquor viscosity reducing and anti-scale agent9 May 2024US 2024/0150961 A1Ecolab USA Inc.
Most cited
By later US patents
- Fluidized bed reactor system69US 4,311,670 AA. Ahlstrom Osakeyhtio · 1982
- Pollution free pulping process using recycled wash effluent from multiple bleach stages to remove black liquor and recovering sodium hydroxide from the black liquor35US 4,619,733 A1986
- Method for improving separation of carbohydrates from wood pulping and wood or biomass hydrolysis liquors32US 7,699,958 B2UT-Battelle, LLC · 2010
- Defoamer composition and method of using the same28US 5,645,762 AHenkel Corporation · 1997
- Method of treating BCTMP/CTMP wastewater25US 5,178,770 ANalco Canada Inc. · 1993