C01B 17/50
Preparation of sulfur dioxide
C01B17/50 (Preparation of sulfur dioxide) appears on 428 US grants and 194 published applications in this corpus.
Search patents in C01B- Granted patents
- 428
- Published applications
- 194
- Assignees
- 261
- Inventors
- 848
- Latest grant
- 26 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 33 | 0 |
| 1977 | 30 | 0 |
| 1978 | 19 | 0 |
| 1979 | 21 | 0 |
| 1980 | 15 | 0 |
| 1981 | 12 | 0 |
| 1982 | 13 | 0 |
| 1983 | 12 | 0 |
| 1984 | 10 | 0 |
| 1985 | 5 | 0 |
| 1986 | 8 | 0 |
| 1987 | 7 | 0 |
| 1988 | 4 | 0 |
| 1989 | 10 | 0 |
| 1990 | 8 | 0 |
| 1991 | 10 | 0 |
| 1992 | 8 | 0 |
| 1993 | 7 | 0 |
| 1994 | 7 | 0 |
| 1995 | 8 | 0 |
| 1996 | 8 | 0 |
| 1997 | 10 | 0 |
| 1998 | 9 | 0 |
| 1999 | 3 | 0 |
| 2000 | 7 | 0 |
| 2001 | 2 | 1 |
| 2002 | 6 | 1 |
| 2003 | 0 | 5 |
| 2004 | 2 | 6 |
| 2005 | 3 | 5 |
| 2006 | 3 | 3 |
| 2007 | 3 | 4 |
| 2008 | 0 | 6 |
| 2009 | 6 | 13 |
| 2010 | 10 | 13 |
| 2011 | 4 | 5 |
| 2012 | 2 | 3 |
| 2013 | 6 | 11 |
| 2014 | 9 | 11 |
| 2015 | 12 | 4 |
| 2016 | 3 | 9 |
| 2017 | 7 | 5 |
| 2018 | 6 | 7 |
| 2019 | 11 | 13 |
| 2020 | 11 | 8 |
| 2021 | 3 | 6 |
| 2022 | 5 | 10 |
| 2023 | 4 | 15 |
| 2024 | 6 | 12 |
| 2025 | 11 | 14 |
| 2026 | 9 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- C01B 17/60Isolation of sulfur dioxide from gases151
- C01B 17/508By oxidation of sulfur compounds87
- C01B 17/501By reduction of sulfur compounds59
- C01B 17/54By burning elemental sulfur47
- C01B 17/58Recovery of sulfur dioxide from acid tar or the like or from40
- C01B 17/56Separation30
- C01B 17/52By roasting sulfides8
Recent patents
- Integrated sulfur recovery and hydrogen production process26 May 2026US 12,637,353 B2
- Method for producing copper metal from copper concentrates without generating waste26 May 2026US 12,637,738 B2Universidad De Concepcion
- 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
- Process and apparatus for oxygen injection in a sulfur furnace14 Apr 2026US 12,600,627 B2Messer Industries USA, Inc.
- Co-production of hydrogen and sulfuric acid by partial oxidation of sulfur7 Apr 2026US 12,595,171 B2Saudi Arabian Oil Company
- Sulfur dioxide mixture-filled container and sulfur dioxide composition1 Oct 2026US 2026/0298410 A1Sumitomo Seika Chemicals Co., Ltd.
- Tail gas treatment by two stage adsorption with intermediate cooling30 Jul 2026US 2026/0216647 A1Saudi Arabian Oil Company
- Methods and systems for producing sulfur-containing products11 Jun 2026US 2026/0159389 A1Applied Technology Limited Partnership
- Process and plant for a permanent storage of phosphogypsum14 May 2026US 2026/0132042 A1Metso Metals Oy
- Comproportionation-based autocatalytic cycles and related methods18 Dec 2025US 2025/0382173 A1Wisconsin Alumni Research Foundation
Most cited
By later US patents
- Plasma whirl reactor apparatus and methods of use164US 7,622,693 B2Foret Plasma Labs, LLC · 2009
- Method and apparatus for flue gas cleaning by separation and liquefaction of sulfur dioxide and carbon dioxide127US 5,133,190 A1992
- Dielectric waveguide sensors and their use in immunoassays111US 4,880,752 ACiba Corning Diagnostics Corp. · 1989
- Method and apparatus for producing a product in a regenerator furnace from impure waste containing a non-gasifiable impurity110US 5,640,709 AMolten Metal Technology, Inc. · 1997
- Method and apparatus for producing a product in a regenerator furnace from impure waste containing a non-gasifiable impurity108US 5,640,706 AMolten Metal Technology, Inc. · 1997