C01B 17/506
Of calcium sulfates
Official title: {of calcium sulfates}
C01B17/506 (Of calcium sulfates) appears on 18 US grants and 9 published applications in this corpus.
Search patents in C01B- Granted patents
- 18
- Published applications
- 9
- Assignees
- 18
- Inventors
- 51
- Latest grant
- 28 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 2 | 0 |
| 1998 | 3 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 2 | 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 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 1 |
| 2021 | 0 | 0 |
| 2022 | 1 | 1 |
| 2023 | 1 | 3 |
| 2024 | 0 | 1 |
| 2025 | 1 | 0 |
| 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.
- 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
- Phosphogypsum decomposition process12 Jul 2022US 11,383,987 B2Ocp SA
- Process and plant for a permanent storage of phosphogypsum14 May 2026US 2026/0132042 A1Metso Metals Oy
- 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
- Integrated method for producing sulphur dioxide quality suitable for a sulphuric acid process from calcium sulphate/phosphogypsum from phosphoric acid production27 Apr 2023US 2023/0126633 A1thyssenkrupp AG
- Integrated method for the commercial and industrial utilisation of calcium sulphate whilst obtaining rare earth elements from the production of phosphoric acid9 Feb 2023US 2023/0039227 A1thyssenkrupp AG
Most cited
By later US patents
- Process for producing cement from a flue gas desulfurization process waste product51US 5,766,339 ADravo Lime Company · 1998
- Calcium sulfate process for the coproduction of Portland cement clinker and concentrated sulfur dioxide adequate to manufacture sulfuric acid20US 5,049,198 A1991
- Process for producing cement and elemental sulfur from a flue gas desulfurization waste product18US 5,769,940 ADravo Lime Company · 1998
- Process and apparatus for producing SO.sub.2 -containing gas and cement clinker from waste gypsum11US 5,626,667 ABabcock-BSH GmbH · 1997
- Apparatus for producing SO.sub.2 -containing gas and cement clinker from waste gypsum7US 5,842,853 ABabcock-BSH GmbH · 1998