C01D 5/14
Preparation of sulfites
Official title: Preparation of sulfites (C01D5/04 takes precedence)
C01D5/14 (Preparation of sulfites) appears on 41 US grants and 26 published applications in this corpus.
Search patents in C01D- Granted patents
- 41
- Published applications
- 26
- Assignees
- 36
- Inventors
- 91
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 3 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 3 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 3 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 1 |
| 2004 | 0 | 0 |
| 2005 | 2 | 0 |
| 2006 | 0 | 2 |
| 2007 | 0 | 0 |
| 2008 | 1 | 3 |
| 2009 | 0 | 0 |
| 2010 | 1 | 4 |
| 2011 | 1 | 0 |
| 2012 | 1 | 0 |
| 2013 | 1 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 1 |
| 2016 | 1 | 2 |
| 2017 | 0 | 0 |
| 2018 | 1 | 2 |
| 2019 | 1 | 1 |
| 2020 | 0 | 0 |
| 2021 | 1 | 1 |
| 2022 | 0 | 2 |
| 2023 | 1 | 3 |
| 2024 | 3 | 1 |
| 2025 | 1 | 1 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Processes for producing alkali hydroxides or alkali sulfites using large molecular weight acid intermediates6 Oct 2026US 12,753,082 B2Innovator Energy, LLC
- Device and method for preparing sulfite26 Aug 2025US 12,398,045 B2Jiangsu Deyitong Environmental Protection Technology Co., Ltd.
- Calcium oxide or magnesium oxide production with alkali and sulfur dioxide intermediates24 Dec 2024US 12,172,955 B2Innovator Energy, LLC
- Sodium bicarbonate or sodium carbonate or sodium hydroxide or calcium oxide or calcium hydroxide or calcium carbonate production with carbon dioxide9 Jul 2024US 12,030,847 B2Innovator Energy, LLC
- Calcium oxide or magnesium oxide production with alkali and sulfur dioxide intermediates25 Jun 2024US 12,017,985 B2Innovator Energy, LLC
- Processes for producing alkali hydroxides or alkali sulfites using large molecular weight acid intermediates4 Jun 2026US 2026/0152406 A1Innovator Energy, LLC
- Plant and method for the purification of fumes and recovery of secondary raw material12 Feb 2026US 2026/0042062 A1Italcer S.P.A. Società Benefit
- Method for leaching iron element from sulfate slag28 Aug 2025US 2025/0270670 A1Sichuan Huiwei Rongda Technology Co., Ltd
- Calcium Oxide or Magnesium Oxide Production with Alkali and Sulfur Dioxide Intermediates8 Aug 2024US 2024/0262777 A1Innovator Energy, LLC
- Calcium Oxide or Magnesium Oxide Production with Alkali and Sulfur Dioxide Intermediates7 Dec 2023US 2023/0391706 A1Innovator Energy, LLC
Most cited
By later US patents
- Apparatus and process for electrodialysis of salts67US 6,221,225 B1Archer Daniels Midland Company · 2001
- Process for removing nitrogen oxides from the flue gases of a pulp mill28US 5,639,434 ATampella Power Oy · 1997
- Method for bisulfite treatment18US 7,413,855 B2Roche Molecular Systems, Inc. · 2008
- Apparatus and process for electrodialysis of salts12US 6,294,066 B1Archer Daniels Midland Company · 2001
- Sodium metabisulfite process8US 5,753,200 ASolvay Minerals, Inc. · 1998