C01F 11/08
By reduction of sulfates
Official title: by reduction of sulfates
C01F11/08 (By reduction of sulfates) appears on 19 US grants and 12 published applications in this corpus.
Search patents in C01F- Granted patents
- 19
- Published applications
- 12
- Assignees
- 18
- Inventors
- 43
- Latest grant
- 28 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 1 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 2 |
| 2015 | 1 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 1 |
| 2021 | 0 | 0 |
| 2022 | 1 | 0 |
| 2023 | 1 | 3 |
| 2024 | 0 | 1 |
| 2025 | 2 | 2 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Integrated method for the commercial and industrial utilisation of calcium sulphate whilst obtaining rare earth elements from the production of phosphoric acid28 Apr 2026US 12,612,309 B2thyssenkrupp AG
- Method for producing phosphoric acid and calcium sulphate quality suitable for a clinker process for the commercial and industrial utilization of calcium sulphate24 Mar 2026US 12,583,747 B2thyssenkrupp AG
- Resource recovery method and resource recovery system of desulfurized ash16 Sep 2025US 12,415,213 B2Hangsu Shagang Group Co., Ltd.
- Processes for producing calcium oxide and sulfuric acid from calcium sulfate with magnesium intermediate18 Mar 2025US 12,252,410 B2Innovator Energy, LLC
- Integrated method for producing sulphur dioxide quality suitable for a sulphuric acid process from calcium sulphate/phosphogypsum from phosphoric acid production19 Dec 2023US 11,845,657 B2thyssenkrupp AG
- Electrochemical metallurgical slag recycling14 May 2026US 2026/0132484 A1Electrasteel, Inc.
- Processes for producing calcium oxide and sulfuric acid from calcium sulfate with magnesium intermediate3 Jul 2025US 2025/0214856 A1Innovator Energy, LLC
- Processes for producing calcium oxide and sulfuric acid from calcium sulfate with magnesium intermediate16 Jan 2025US 2025/0019253 A1Innovator Energy, LLC
- Resource recovery method and resource recovery system of desulfurized ash28 Mar 2024US 2024/0100579 A1Institute of Research of Iron and Steel, Jiangsu Province/Sha-Steel, Co., Ltd.
- Method for producing phosphoric acid and calcium sulphate quality suitable for a clinker process for the commercial and industrial utilization of calcium sulphate23 Nov 2023US 2023/0373789 A1thyssenkrupp AG
Most cited
By later US patents
- Simultaneous reductive and oxidative decomposition of calcium sulfate in the same fluidized bed23US 4,102,989 AIowa State University Research Foundation, Inc. · 1978
- Cyclic process for oxidation of calcium sulfide16US 6,083,862 AIowa State University Research Foundation, Inc. · 2000
- Desulfurization of phosphogypsum14US 4,503,018 ADavy McKee Aktiengesellschaft · 1985
- Process for treating phospho-gypsum waste product from wet-acid process of making phosphoric acid6US 4,608,238 A1986
- Cyclic process for oxidation of calcium sulfide6US 5,433,939 A1995