C21C 5/38
Removal of waste gases or dust
C21C5/38 (Removal of waste gases or dust) appears on 159 US grants and 78 published applications in this corpus.
Search patents in C21C- Granted patents
- 159
- Published applications
- 78
- Assignees
- 101
- Inventors
- 358
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 10 | 0 |
| 1977 | 11 | 0 |
| 1978 | 12 | 0 |
| 1979 | 5 | 0 |
| 1980 | 9 | 0 |
| 1981 | 13 | 0 |
| 1982 | 4 | 0 |
| 1983 | 5 | 0 |
| 1984 | 4 | 0 |
| 1985 | 3 | 0 |
| 1986 | 4 | 0 |
| 1987 | 4 | 0 |
| 1988 | 4 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 3 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 2 | 0 |
| 2000 | 5 | 0 |
| 2001 | 2 | 1 |
| 2002 | 1 | 0 |
| 2003 | 0 | 2 |
| 2004 | 0 | 3 |
| 2005 | 1 | 2 |
| 2006 | 1 | 1 |
| 2007 | 0 | 1 |
| 2008 | 2 | 2 |
| 2009 | 1 | 5 |
| 2010 | 1 | 6 |
| 2011 | 3 | 6 |
| 2012 | 7 | 3 |
| 2013 | 4 | 5 |
| 2014 | 3 | 3 |
| 2015 | 1 | 1 |
| 2016 | 2 | 8 |
| 2017 | 2 | 3 |
| 2018 | 1 | 2 |
| 2019 | 1 | 0 |
| 2020 | 6 | 4 |
| 2021 | 2 | 1 |
| 2022 | 2 | 3 |
| 2023 | 1 | 0 |
| 2024 | 1 | 7 |
| 2025 | 2 | 7 |
| 2026 | 4 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Blast furnace—converter steel production method based on carbon cycling28 Jul 2026US 12,692,561 B2Cisdi Engineering Co., Ltd
- Method of introducing a metalliferous feed in an ironmaking process19 May 2026US 12,630,892 B2Tata Steel Ijmuiden B.V.
- Steel making plant with electric arc furnace21 Apr 2026US 12,607,409 B2SMS group GmbH
- Joint regulation method of material flow, energy flow, and carbon emission flow in long-process iron and steel enterprises10 Mar 2026US 12,571,060 B2Northeast Electric Power University
- Metallurgical furnace having an integrated off-gas hood6 May 2025US 12,292,237 B2Systems Spray-Cooled, Inc.
- Systematic carbon emissions reduction method for whole process of production and casting3 Sep 2026US 2026/0258513 A1Jiqing Low Carbon Technology (Qinhuangdao) Co., Ltd.
- Blast Furnace - Converter Steel Production Method Based on Carbon Cycling12 Feb 2026US 2026/0043097 A1Cisdi Engineering Co., Ltd
- Joint regulation method of material flow, energy flow, and carbon emission flow in long-process iron and steel enterprises4 Dec 2025US 2025/0369060 A1Northeast Electric Power University
- Metallurgical plant and method28 Aug 2025US 2025/0271216 A1Danieli & C. Officine Meccaniche SpA
- Process for reducing fossil co2 emissions17 Jul 2025US 2025/0229224 A1Paul Wurth S. A.
Most cited
By later US patents
- Pipe curtain for pollution control hood45US 4,245,820 AWheeling-Pittsburgh Steel Corporation · 1981
- Direct smelting plant43US 8,562,903 B2Technological Resources Pty. Limited · 2013
- Method of cleaning gas from solid and gaseous matter and apparatus materializing same25US 4,957,512 A1990
- Dust suppression method and composition24US 4,171,276 ABetz Laboratories, Inc. · 1979
- Method of treating metallic oxide impregnated dust17US 4,878,944 AThe TDJ Group, Inc. · 1989