D21C 7/14
Means for circulating the lye
D21C7/14 (Means for circulating the lye) appears on 124 US grants and 83 published applications in this corpus.
Search patents in D21C- Granted patents
- 124
- Published applications
- 83
- Assignees
- 39
- Inventors
- 137
- Latest grant
- 13 Jun 2023
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 3 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 6 | 0 |
| 1997 | 5 | 0 |
| 1998 | 8 | 0 |
| 1999 | 2 | 0 |
| 2000 | 13 | 0 |
| 2001 | 7 | 5 |
| 2002 | 5 | 5 |
| 2003 | 5 | 9 |
| 2004 | 1 | 6 |
| 2005 | 1 | 6 |
| 2006 | 5 | 4 |
| 2007 | 4 | 4 |
| 2008 | 3 | 6 |
| 2009 | 5 | 3 |
| 2010 | 6 | 7 |
| 2011 | 3 | 2 |
| 2012 | 4 | 1 |
| 2013 | 2 | 4 |
| 2014 | 5 | 7 |
| 2015 | 6 | 4 |
| 2016 | 2 | 3 |
| 2017 | 2 | 4 |
| 2018 | 3 | 0 |
| 2019 | 2 | 1 |
| 2020 | 0 | 1 |
| 2021 | 3 | 1 |
| 2022 | 2 | 0 |
| 2023 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- System for treatment of a biomass material and a method for connecting a valve to a transporting pipe13 Jun 2023US 11,674,264 B2Valmet Corporation
- Process for obtaining cellulose29 Nov 2022US 11,512,426 B2
- Method of producing chemical pulp18 Oct 2022US 11,473,241 B2Andritz Inc.
- Method and a system for production of high molecular weight lignin30 Nov 2021US 11,186,948 B2Fibratech Pte. Ltd
- Biomass pulp digester2 Nov 2021US 11,162,218 B1
- System for treatment of a biomass material and a method for connecting a valve to a transporting pipe1 Jul 2021US 2021/0197155 A1Valmet Corporation
- Method of producing chemical pulp11 Jun 2020US 2020/0181838 A1Andritz Inc.
- A method and a system for production of high molecular weight lignin26 Sep 2019US 2019/0292725 A1Fibratech Pte. Ltd
- Profile bar screen for digester vessels5 Oct 2017US 2017/0284022 A1Valmet Corporation
- Method of digesting cellulose fibrous material in a continuous digester26 Jan 2017US 2017/0022664 A1Stora Enso OYJ
Most cited
By later US patents
- Oxygen pulping with recycled liquor35US 4,248,662 AThe Black Clawson Company · 1981
- Screen plate having a plurality of inclined slots in a digester26US 6,165,323 AAndritz-Ahlstrom Inc. · 2000
- Pulping with low dissolved solids for improved pulp strength21US 5,489,363 AKamyr, Inc. · 1996
- Digester system for implementing low dissolved solids profiling21US 5,536,366 AAhlstrom Machinery Inc. · 1996
- Continuous digester with dissolved solids handling19US 5,662,775 AAhlstrom Machinery Inc. · 1997