C01D 7/126
Multi-step processes
Official title: {Multi-step processes, e.g. from trona to soda ash}
C01D7/126 (Multi-step processes) appears on 68 US grants and 40 published applications in this corpus.
Search patents in C01D- Granted patents
- 68
- Published applications
- 40
- Assignees
- 29
- Inventors
- 101
- Latest grant
- 7 Oct 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 3 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 4 | 0 |
| 1998 | 1 | 0 |
| 1999 | 3 | 0 |
| 2000 | 4 | 0 |
| 2001 | 4 | 1 |
| 2002 | 0 | 3 |
| 2003 | 3 | 1 |
| 2004 | 1 | 2 |
| 2005 | 1 | 0 |
| 2006 | 1 | 4 |
| 2007 | 0 | 2 |
| 2008 | 1 | 2 |
| 2009 | 3 | 0 |
| 2010 | 3 | 4 |
| 2011 | 1 | 2 |
| 2012 | 0 | 1 |
| 2013 | 0 | 3 |
| 2014 | 3 | 3 |
| 2015 | 2 | 7 |
| 2016 | 4 | 0 |
| 2017 | 2 | 1 |
| 2018 | 2 | 1 |
| 2019 | 1 | 0 |
| 2020 | 1 | 1 |
| 2021 | 0 | 1 |
| 2022 | 2 | 0 |
| 2023 | 0 | 1 |
| 2024 | 0 | 0 |
| 2025 | 2 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Process for treating a sodium carbonate purge7 Oct 2025US 12,434,976 B1Solvay SA
- Soda ash and sodium bicarbonate production method1 Apr 2025US 12,264,079 B2China Tianchen Engineering Corporation
- Process for producing a concentrated aqueous sodium hydroxide solution11 Oct 2022US 11,465,907 B2Solvay SA
- Treatment method for reducing carbon dioxide emission of combustion exhaust gas16 Aug 2022US 11,414,323 B2Sentec Ltd
- Process for the joint production of sodium carbonate and sodium bicarbonate20 Oct 2020US 10,807,876 B2Solvay SA
- Soda ash and sodium bicarbonate production method6 Apr 2023US 2023/0103792 A1China Tianchen Engineering Corporation
- Process for treating a sodium carbonate purge11 Mar 2021US 2021/0070620 A1Solvay SA
- Treatment method for reducing carbon dioxide emission of combustion exhaust gas30 Apr 2020US 2020/0131045 A1Sentec Ltd
- Process for the joint production of sodium carbonate and sodium bicarbonate9 Aug 2018US 2018/0222759 A1Solvay SA
- Process for treating a sodium carbonate purge29 Jun 2017US 2017/0183237 A1Solvay SA
Most cited
By later US patents
- Sodium carbonate and sodium bicarbonate production from nahcolitic oil shale86US 6,609,761 B1American Soda, LLP · 2003
- Production of sodium carbonate from solution mine brine59US 5,955,043 ATg Soda Ash, Inc. · 1999
- Process for producing sodium salts from brines of sodium ores57US 5,283,054 AFMC Corporation · 1994
- Process for producing sodium salts from brines of sodium ores47US 5,262,134 AFMC Corporation · 1993
- Equilibrium production of sodium carbonate from sodium bicarbonate43US 5,609,838 ATg Soda Ash, Inc. · 1997