D21C 11/02
Regeneration of pulp liquors or effluent waste waters: of acid, neutral or
Official title: of {acid, neutral or alkaline} sulfite lye
D21C11/02 (Regeneration of pulp liquors or effluent waste waters: of acid, neutral or) appears on 14 US grants and 16 published applications in this corpus.
Search patents in D21C- Granted patents
- 14
- Published applications
- 16
- Assignees
- 18
- Inventors
- 63
- Latest grant
- 29 Apr 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 1 |
| 2003 | 0 | 1 |
| 2004 | 0 | 1 |
| 2005 | 1 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 2 |
| 2011 | 0 | 0 |
| 2012 | 1 | 2 |
| 2013 | 1 | 0 |
| 2014 | 1 | 1 |
| 2015 | 1 | 1 |
| 2016 | 2 | 1 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 1 |
| 2022 | 0 | 1 |
| 2023 | 0 | 1 |
| 2024 | 0 | 3 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Method for preparing fluff pulp from bamboos and fluff pulp prepared thereby29 Apr 2025US 12,286,750 B2South China University of Technology
- Lignosulfonate of a certain quality and method of preparation of lignosulfonate of a certain quality20 Sep 2016US 9,447,131 B2Domsjö Fabriker AB
- Method for producing bio-methanol at pulp mills19 Jul 2016US 9,394,220 B2FPInnovations
- Conditioning of SO2-ethanol-water spent liquor for fermentation by clostridia21 Apr 2015US 9,012,188 B2API Intellectual Property Holdings, LLC
- Circular utilization method in pulping and papermaking processes with straw15 Jul 2014US 8,778,135 B2Shandong Tralin Paper Co., Ltd.
- Treating black liquor with acidic biomass for lignin recovery21 Nov 2024US 2024/0383937 A1SunCarbon AB
- Method for preparing fluff pulp from bamboos and fluff pulp prepared thereby3 Oct 2024US 2024/0328083 A1South China University of Technology
- Method and system for producing lignin29 Aug 2024US 2024/0287737 A1Valmet Corporation
- Methods of treating a kraft process recovery cycle to reduce metal levels at the kraft process31 Aug 2023US 2023/0272581 A1Suzano S.A.
- Chemically modified lignin as reducing agent for enzymatic hydrolysis of lignocellulosic biomass24 Mar 2022US 2022/0090155 A1Borregaard AS
Most cited
By later US patents
- Method for fractionating sulphite cooking liquor49US 5,637,225 AXyrofin Oy · 1997
- Conditioning of SO2-ethanol-water spent liquor for fermentation by clostridia10US 9,012,188 B2API Intellectual Property Holdings, LLC · 2015
- Method for recovery and reuse of ammonia in ammonia-base sulfite cooking liquors8US 4,336,102 ACombustion Engineering, Inc. · 1982
- Method for recycling sulfur dioxide from sulfite pulping liquors7US 5,096,540 A1992
- Method for recovering a low sodium content lignin fuel from black liquor6US 8,252,141 B2Andritz Inc. · 2012