C01D 5/145
Pyrosulfites or metabisulfites
Official title: {Pyrosulfites or metabisulfites}
C01D5/145 (Pyrosulfites or metabisulfites) appears on 8 US grants and 3 published applications in this corpus.
Search patents in C01D- Granted patents
- 8
- Published applications
- 3
- Assignees
- 9
- Inventors
- 23
- Latest grant
- 26 Aug 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1989 | 2 | 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 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 1 |
| 2004 | 0 | 0 |
| 2005 | 2 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 1 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 1 |
| 2023 | 0 | 0 |
| 2024 | 0 | 0 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Device and method for preparing sulfite26 Aug 2025US 12,398,045 B2Jiangsu Deyitong Environmental Protection Technology Co., Ltd.
- Method for bisulfite treatment19 Aug 2008US 7,413,855 B2Roche Molecular Systems, Inc.
- Process for purifying aqueous buffer solutions1 Nov 2005US 6,960,332 B2
- System and method for precipitating salts3 May 2005US 6,887,452 B1United States Filter Corporation
- Sodium metabisulfite process2 Nov 1999US 5,976,485 ASolvay Minerals, Inc.
Most cited
By later US patents
- Method for bisulfite treatment18US 7,413,855 B2Roche Molecular Systems, Inc. · 2008
- Sodium metabisulfite process8US 5,753,200 ASolvay Minerals, Inc. · 1998
- System and method for precipitating salts6US 6,887,452 B1United States Filter Corporation · 2005
- Sodium metabisulfite process5US 5,976,485 ASolvay Minerals, Inc. · 1999
- Production of sulfur from sulfur dioxide obtained from flue gas4US 4,837,001 AT-Thermal, Inc. · 1989