D21C 3/14
Ammonium bisulfite
Official title: ammonium bisulfite
D21C3/14 (Ammonium bisulfite) appears on 4 US grants and 7 published applications in this corpus.
Search patents in D21C- Granted patents
- 4
- Published applications
- 7
- Assignees
- 6
- Inventors
- 24
- Latest grant
- 19 Sep 2017
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1987 | 1 | 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 | 0 |
| 2002 | 0 | 1 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 1 | 1 |
| 2015 | 0 | 0 |
| 2016 | 0 | 2 |
| 2017 | 1 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Treatment of biomass to dissolve lignin with ionic liquid composition19 Sep 2017US 9,765,478 B2Imperial Innovations Limited
- Raw Paper8 Jul 2014US 8,771,465 B2Shandong Fuyin Paper & Environmental Protection Technology Co., Ltd.
- Hardwood pulp having a tactile sense of softness, and tissue paper webs thereof29 Mar 1988US 4,734,162 AThe Procter & Gamble Company
- Sulfite process for making pulp having a tactile softness from hardwood chips6 Jan 1987US 4,634,499 AThe Procter & Gamble Company
- A process for production of fossil free hydrocarbons from lignocellulosic material5 Dec 2024US 2024/0400910 A1SUND Group s.r.o.
- Integrated process for producing cellulosic pulp and polyols stream15 Dec 2016US 2016/0362353 A1Biochemtex S.p.A.
- Treatment11 Feb 2016US 2016/0040354 A1
- Treatment13 Mar 2014US 2014/0073016 A1Imperial Innovations Limited
- Raw paper and production method and application thereof8 Dec 2011US 2011/0297343 A1Shandong Fuyin Paper & Enviromental Protection Technology Co., Ltd.
Most cited
By later US patents
- Hardwood pulp having a tactile sense of softness, and tissue paper webs thereof20US 4,734,162 AThe Procter & Gamble Company · 1988
- Treatment of biomass to dissolve lignin with ionic liquid composition12US 9,765,478 B2Imperial Innovations Limited · 2017
- Sulfite process for making pulp having a tactile softness from hardwood chips9US 4,634,499 AThe Procter & Gamble Company · 1987