D21C 11/0014
Combination of various pulping processes with one or several recovery systems
Official title: {Combination of various pulping processes with one or several recovery systems (cross-recovery)}
D21C11/0014 (Combination of various pulping processes with one or several recovery systems) appears on 22 US grants and 16 published applications in this corpus.
Search patents in D21C- Granted patents
- 22
- Published applications
- 16
- Assignees
- 23
- Inventors
- 57
- Latest grant
- 12 Aug 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 4 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 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 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 1 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 1 | 1 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 1 | 0 |
| 2014 | 2 | 2 |
| 2015 | 1 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 1 |
| 2019 | 0 | 2 |
| 2020 | 2 | 4 |
| 2021 | 0 | 0 |
| 2022 | 0 | 1 |
| 2023 | 3 | 0 |
| 2024 | 0 | 1 |
| 2025 | 2 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Method for recovering water and chemicals from plants for treating effluents from pulp and paper factories12 Aug 2025US 12,384,708 B2Investigaciones Forestales Bioforest S.A.
- Method for preparing fluff pulp from bamboos and fluff pulp prepared thereby29 Apr 2025US 12,286,750 B2South China University of Technology
- System and method for mill effluent biological oxygen demand (BOD) reduction4 Jul 2023US 11,692,309 B2First Quality Tissue, LLC
- Method and a system for adjusting S/Na-balance of a pulp mill25 Apr 2023US 11,634,864 B2Valmet Technologies Oy
- Method and a system for adjusting S/Na-balance of a pulp mill4 Apr 2023US 11,619,000 B2Valmet Technologies Oy
- Process for production of lignin, organic acids, organic chemicals, pure co2, and water from kraft black liquor with operational efficiencies14 Aug 2025US 2025/0257526 A1Georgia Tech Research Corporation
- Method for preparing fluff pulp from bamboos and fluff pulp prepared thereby3 Oct 2024US 2024/0328083 A1South China University of Technology
- Method for recovering water and chemicals from plants for treating effluents from pulp and paper factories30 Jun 2022US 2022/0204377 A1Investigaciones Forestales Bioforest S.A.
- A method and a system for adjusting s/na -balance of a pulp mill10 Dec 2020US 2020/0385925 A1Valmet Technologies Oy
- A method and a system for adjusting s/na -balance of a pulp mill17 Sep 2020US 2020/0291574 A1Valmet Technologies Oy
Most cited
By later US patents
- Method for producing furfural, acetic acid and formic acid from spent pulp-cooking liquor23US 6,955,743 B2Chempolis Oy · 2005
- Method for purifying resin-containing waste liquor in the manufacture of cellulose pulps22US 4,921,613 ABoliden Aktiebolag · 1990
- High yield semichemical wood pulping process8US 4,073,678 AWestvaco Corporation · 1978
- Method for the preparation of a pulp6US 4,118,271 AJujo Paper Co., Ltd. · 1978
- Recovery system for oxygen bleaching of pulp6US 4,131,508 AKamyr, Inc. · 1978