D21C 3/12
Sodium bisulfite
Official title: sodium bisulfite
D21C3/12 (Sodium bisulfite) appears on 15 US grants and 19 published applications in this corpus.
Search patents in D21C- Granted patents
- 15
- Published applications
- 19
- Assignees
- 14
- Inventors
- 47
- Latest grant
- 29 Apr 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 1 |
| 2002 | 0 | 1 |
| 2003 | 2 | 1 |
| 2004 | 0 | 0 |
| 2005 | 1 | 3 |
| 2006 | 0 | 0 |
| 2007 | 1 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 1 | 0 |
| 2011 | 0 | 1 |
| 2012 | 2 | 2 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 1 |
| 2017 | 0 | 0 |
| 2018 | 0 | 1 |
| 2019 | 1 | 1 |
| 2020 | 0 | 2 |
| 2021 | 1 | 1 |
| 2022 | 1 | 1 |
| 2023 | 2 | 1 |
| 2024 | 0 | 0 |
| 2025 | 1 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Strong and tough structural wood materials, and methods for fabricating and use thereof29 Apr 2025US 12,285,882 B2University of Maryland, College Park
- Method of transforming high consistency pulp fibers into pre-dispersed semi-dry and dry fibrous materials5 Dec 2023US 11,834,785 B2FPInnovations
- Strong and tough structural wood materials, and methods for fabricating and use thereof17 Jan 2023US 11,554,514 B2University of Maryland, College Park
- Method for producing a fibrous material27 Dec 2022US 11,535,983 B2Andritz Inc.
- Strong and tough structural wood materials, and methods for fabricating and use thereof28 Sep 2021US 11,130,256 B2University of Maryland, College Park
- Strong and tough structural wood materials, and methods for fabricating and use thereof22 May 2025US 2025/0162189 A1University of Maryland, College Park
- Strong and tough structural wood materials, and methods for fabricating and use thereof1 Jun 2023US 2023/0166427 A1University of Maryland, College Park
- Strong and tough structural wood materials, and methods for fabricating and use thereof10 Feb 2022US 2022/0040881 A1University of Maryland, College Park
- Method of transforming high consistency pulp fibers into pre-dispersed semi-dry and dry fibrous materials16 Sep 2021US 2021/0285156 A1FPInnovations
- Method of providing a paper fibre composition8 Oct 2020US 2020/0318287 A1Holmen AB
Most cited
By later US patents
- Chemithermomechanical pulping process employing separate alkali and sulfite treatments22US 4,486,267 AThe Mead Corporation · 1984
- Enhanced fiber additive; and use10US 6,902,649 B1Cargill, Incorporated · 2005
- Strong and tough structural wood materials, and methods for fabricating and use thereof6US 11,130,256 B2University of Maryland, College Park · 2021
- Cellulose slurry treating systems for adding AQ to a cellulose slurry in the substantial absence of alkali5US 6,569,289 B2Andritz Inc. · 2003
- Strong and tough structural wood materials, and methods for fabricating and use thereof4US 11,554,514 B2University of Maryland, College Park · 2023