C01B 17/02
Preparation of sulfur
Official title: Preparation of sulfur; Purification
C01B17/02 (Preparation of sulfur) appears on 1,440 US grants and 676 published applications in this corpus.
Search patents in C01B- Granted patents
- 1,440
- Published applications
- 676
- Assignees
- 582
- Inventors
- 2,216
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 54 | 0 |
| 1977 | 51 | 0 |
| 1978 | 48 | 0 |
| 1979 | 31 | 0 |
| 1980 | 37 | 0 |
| 1981 | 37 | 0 |
| 1982 | 27 | 0 |
| 1983 | 43 | 0 |
| 1984 | 45 | 0 |
| 1985 | 42 | 0 |
| 1986 | 28 | 0 |
| 1987 | 24 | 0 |
| 1988 | 28 | 0 |
| 1989 | 46 | 0 |
| 1990 | 38 | 0 |
| 1991 | 32 | 0 |
| 1992 | 27 | 0 |
| 1993 | 24 | 0 |
| 1994 | 25 | 0 |
| 1995 | 23 | 0 |
| 1996 | 27 | 0 |
| 1997 | 22 | 0 |
| 1998 | 28 | 0 |
| 1999 | 21 | 0 |
| 2000 | 23 | 0 |
| 2001 | 20 | 7 |
| 2002 | 16 | 26 |
| 2003 | 30 | 18 |
| 2004 | 12 | 17 |
| 2005 | 14 | 19 |
| 2006 | 11 | 20 |
| 2007 | 18 | 17 |
| 2008 | 14 | 15 |
| 2009 | 21 | 33 |
| 2010 | 27 | 35 |
| 2011 | 23 | 30 |
| 2012 | 14 | 38 |
| 2013 | 42 | 26 |
| 2014 | 36 | 39 |
| 2015 | 29 | 28 |
| 2016 | 20 | 26 |
| 2017 | 31 | 36 |
| 2018 | 29 | 25 |
| 2019 | 34 | 29 |
| 2020 | 35 | 36 |
| 2021 | 28 | 32 |
| 2022 | 28 | 27 |
| 2023 | 21 | 28 |
| 2024 | 22 | 30 |
| 2025 | 18 | 24 |
| 2026 | 16 | 15 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- C01B 17/04From gaseous sulfur compounds including gaseous sulfides1,084
- C01B 17/0232Purification88
- C01B 17/06From non-gaseous sulfides or materials containing such sulfides66
- C01B 17/0243Other after-treatment of sulfur56
- C01B 17/0237Converting into particles49
- C01B 17/027Recovery of sulfur from material containing elemental sulfur42
- C01B 17/021Separation of sulfur from gases34
- C01B 17/0205Separation of sulfur from liquids23
All 14 subgroupsShow fewer
Recent patents
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- Resource utilization method of crude sodium sulfate22 Sep 2026US 12,741,871 B2Hunan Fortune Environmental Technology Co., LTD.
- Producing hydrogen from hydrogen sulfide1 Sep 2026US 12,722,970 B2Saudi Arabian Oil Company
- Plasma reactor and plasma chemical reactions18 Aug 2026US 12,708,890 B2Nanoplazz Technologies Ltd.
- Generate hydrogen as fuel at natural gas processing plant to reduce carbon dioxide emissions11 Aug 2026US 12,704,082 B2Saudi Arabian Oil Company
- Reactor system and method thereof for degassing sulfur1 Oct 2026US 2026/0296887 A1Fluor Technologies Corporation
- Use of polyether siloxanes as processing aids for melt granulation1 Oct 2026US 2026/0297340 A1Evonik Operations GmbH
- Tail gas treatment by two stage adsorption with intermediate cooling30 Jul 2026US 2026/0216647 A1Saudi Arabian Oil Company
- Sulfur granule with improved crush strength23 Jul 2026US 2026/0209133 A1Tessenderlo Group NV
- Method for recovering phosphorus, iron, and sulfur elements from ferrophosphorus slag while co-producing ammonium phosphate fertilizer9 Jul 2026US 2026/0193145 A1Yunnan Minzu University
Most cited
By later US patents
- Composite hydrogen separation element and module185US 5,498,278 ABend Research, Inc. · 1996
- Composite hydrogen separation element and module164US 5,645,626 ABend Research, Inc. · 1997
- Plasma whirl reactor apparatus and methods of use164US 7,622,693 B2Foret Plasma Labs, LLC · 2009
- Methods and configurations for acid gas enrichment156US 7,635,408 B2Fluor Technologies Corporation · 2009
- Method and apparatus for treating a sour gas146US 8,206,669 B2Air Products and Chemicals, Inc. · 2012