C01D 5/02
Preparation of sulfates from alkali metal salts and sulfuric acid or bisulfates
Official title: Preparation of sulfates from alkali metal salts and sulfuric acid or bisulfates; Preparation of bisulfates
C01D5/02 (Preparation of sulfates from alkali metal salts and sulfuric acid or bisulfates) appears on 49 US grants and 57 published applications in this corpus.
Search patents in C01D- Granted patents
- 49
- Published applications
- 57
- Assignees
- 58
- Inventors
- 161
- Latest grant
- 13 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 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 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 1 |
| 2002 | 2 | 3 |
| 2003 | 1 | 0 |
| 2004 | 3 | 2 |
| 2005 | 0 | 3 |
| 2006 | 4 | 3 |
| 2007 | 0 | 0 |
| 2008 | 0 | 2 |
| 2009 | 0 | 0 |
| 2010 | 1 | 1 |
| 2011 | 1 | 0 |
| 2012 | 1 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 2 |
| 2015 | 1 | 2 |
| 2016 | 1 | 3 |
| 2017 | 1 | 2 |
| 2018 | 3 | 4 |
| 2019 | 2 | 1 |
| 2020 | 3 | 5 |
| 2021 | 2 | 2 |
| 2022 | 3 | 5 |
| 2023 | 1 | 4 |
| 2024 | 6 | 10 |
| 2025 | 0 | 2 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Sodium sulfate by-product processing in lithium and battery chemical production13 Jan 2026US 12,522,510 B2Hatch Ltd.
- Extraction of lithium with chemical additives10 Dec 2024US 12,162,773 B2Lilac Solutions, Inc.
- Process for producing potassium sulphate10 Dec 2024US 12,162,775 B2Tessenderlo Group NV
- Recovery of bromine from waste bromide brines27 Aug 2024US 12,071,353 B2Reaction 35, LLC
- Process and method for producing crystallized metal sulfates6 Aug 2024US 12,054,401 B2Hatch Ltd.
- Methods for the production of sulfate salts and furnace suitable for use in these methods5 Jun 2025US 2025/0177944 A1Tessenderlo Group NV
- Extraction of lithium with chemical additives5 Jun 2025US 2025/0178915 A1Lilac Solutions, Inc.
- Processing hard rock lithium minerals or other materials to produce lithium materials and byproducts converted from a sodium sulfate intermediate product26 Dec 2024US 2024/0425381 A1Frontier Lithium Inc.
- Process and method for producing crystallized metal sulfates12 Dec 2024US 2024/0409432 A1Hatch Ltd.
- Processing hard rock lithium minerals or other materials to produce both lithium carbonate and lithium hydroxide7 Nov 2024US 2024/0367990 A1Frontier Lithium Inc.
Most cited
By later US patents
- Alkali metal catalyst recovery system62US 4,057,512 AExxon Research & Engineering Co. · 1977
- Solution mining of sodium minerals with acids generated by electrodialytic water splitting39US 4,636,289 AAllied Corporation · 1987
- Manufacture of potassium sulfate21US 3,998,935 APennzoil Company · 1976
- Production of potassium sulfate and hydrogen chloride20US 4,045,543 APennzoil Company · 1977
- Process of producing a potassium sulfate salt19US 4,342,737 AAsahi Kasei Kogyo Kabushiki Kaisha · 1982