C21B 2100/42
Sulphur removal
C21B2100/42 (Sulphur removal) appears on 91 US grants and 40 published applications in this corpus.
Search patents in C21B- Granted patents
- 91
- Published applications
- 40
- Assignees
- 60
- Inventors
- 194
- Latest grant
- 24 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 5 | 0 |
| 1978 | 2 | 0 |
| 1979 | 4 | 0 |
| 1980 | 7 | 0 |
| 1981 | 4 | 0 |
| 1982 | 5 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 4 | 0 |
| 1986 | 2 | 0 |
| 1987 | 0 | 0 |
| 1988 | 5 | 0 |
| 1989 | 5 | 0 |
| 1990 | 3 | 0 |
| 1991 | 2 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 3 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 4 | 0 |
| 2001 | 2 | 0 |
| 2002 | 1 | 1 |
| 2003 | 1 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 1 |
| 2006 | 0 | 3 |
| 2007 | 0 | 3 |
| 2008 | 0 | 0 |
| 2009 | 1 | 4 |
| 2010 | 2 | 3 |
| 2011 | 2 | 1 |
| 2012 | 1 | 2 |
| 2013 | 2 | 0 |
| 2014 | 1 | 4 |
| 2015 | 0 | 1 |
| 2016 | 1 | 3 |
| 2017 | 3 | 1 |
| 2018 | 1 | 2 |
| 2019 | 2 | 0 |
| 2020 | 0 | 1 |
| 2021 | 3 | 2 |
| 2022 | 1 | 2 |
| 2023 | 0 | 0 |
| 2024 | 0 | 2 |
| 2025 | 0 | 1 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Gas production apparatus, gas production system, steel production system, chemical manufacturing system, and gas production method with reduced carbon dioxide emission24 Mar 2026US 12,582,941 B2Sekisui Chemical Co., Ltd.
- Method for off-gas composition control in a metal smelting apparatus19 Jul 2022US 11,390,926 B2Tata Steel Nederland Technology B.V.
- Method and apparatus for producing direct reduced iron utilizing a catalytical pretreatment of hydrocarbons as a source of reducing gas21 Dec 2021US 11,203,791 B2Danieli & C. Officine Meccaniche SpA
- Reduction gas extraction from saturated top gas3 Aug 2021US 11,078,549 B2Primetals Technologies Austria GmbH
- Direct reduction with coal gasification and coke oven gas1 Jun 2021US 11,021,766 B2Midrex Technologies, Inc.
- Systematic carbon emissions reduction method for whole process of production and casting3 Sep 2026US 2026/0258513 A1Jiqing Low Carbon Technology (Qinhuangdao) Co., Ltd.
- Method for refining metal27 Aug 2026US 2026/0250795 A1Ferrum Technologies FlexCo
- Process for reducing fossil co2 emissions17 Jul 2025US 2025/0229224 A1Paul Wurth S. A.
- Method for operating a blast furnace installation8 Aug 2024US 2024/0263258 A1Paul Wurth S. A.
- Direct reduced iron system and method using synthetic combustion air4 Jul 2024US 2024/0218474 A1Nucor Corporation
Most cited
By later US patents
- Process for production of elemental iron82US 7,931,731 B2Shell Oil Company · 2011
- Production of carbon monoxide by the gasification of carbonaceous materials78US 4,265,868 AKoppers Company, Inc. · 1981
- Method for the direct reduction of iron ore61US 4,160,663 A1979
- Method for co-producing fuel and iron59US 5,529,599 A1996
- Combustion looping using composite oxygen carriers43US 7,767,191 B2The Ohio State University · 2010