C01B 17/44
By reduction of sulfates
Official title: by reduction of sulfates
C01B17/44 (By reduction of sulfates) appears on 10 US grants and 7 published applications in this corpus.
Search patents in C01B- Granted patents
- 10
- Published applications
- 7
- Assignees
- 9
- Inventors
- 29
- Latest grant
- 22 Jul 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 0 |
| 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 | 1 |
| 2016 | 0 | 1 |
| 2017 | 1 | 0 |
| 2018 | 1 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 1 |
| 2025 | 1 | 2 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Systems and methods for producing alkali hydroxides and sulfuric acid or hydrochloric acid22 Jul 2025US 12,365,597 B1Innovator Energy, LLC
- Integrated calcium looping combined cycle for sour gas applications24 Apr 2018US 9,951,689 B2Saudi Arabian Oil Company
- Sour gas combustion using in-situ oxygen production and chemical looping combustion14 Feb 2017US 9,566,546 B2Saudi Arabian Oil Company
- Process for producing calcium sulfide8 Jan 2002US 6,337,058 B1
- Process for removing SO.sub.2 from gases which contain it, with direct production of elemental sulfur8 Apr 1997US 5,618,507 AEngitec S.p.A.
- Systems and methods for producing alkali hydroxides and sulfuric acid or hydrochloric acid11 Jun 2026US 2026/0159405 A1Innovator Energy, LLC
- Systems and methods for producing alkali hydroxides and sulfuric acid or hydrochloric acid24 Jul 2025US 2025/0236531 A1Innovator Energy, LLC
- System and method for production of calcium oxide with reduced carbon footprint20 Mar 2025US 2025/0091965 A1Peregrine Hydrogen Inc.
- System and method for production of calcium oxide with reduced carbon footprint6 Jun 2024US 2024/0182375 A1Peregrine Hydrogen Inc.
- Integrated Calcium Looping Combined Cycle for Sour Gas Applications21 Jan 2016US 2016/0017798 A1Saudi Arabian Oil Company
Most cited
By later US patents
- Sulfate reduction process useful in coal gasification56US 4,704,136 AFreeport-McMoRan Resource Partners, Limited Partnership · 1987
- Process for removing SO.sub.2 from gases which contain it, with direct production of elemental sulfur11US 5,618,507 AEngitec S.p.A. · 1997
- Method for improving reducing potential of natural gas feed6US 5,399,323 AGas Research Institute · 1995
- Process and apparatus for removing sulfur from stack gases in the form of elemental sulfur5US 4,078,048 ACombustion Equipment Associates, Inc. · 1978
- Sour gas combustion using in-situ oxygen production and chemical looping combustion4US 9,566,546 B2Saudi Arabian Oil Company · 2017