C21C 5/5252
In an electrically heated multi-chamber furnace, a combination of electric furnaces or
Official title: {in an electrically heated multi-chamber furnace, a combination of electric furnaces or an electric furnace arranged for associated working with a non electric furnace}
C21C5/5252 (In an electrically heated multi-chamber furnace, a combination of electric furnaces or) appears on 53 US grants and 35 published applications in this corpus.
Search patents in C21C- Granted patents
- 53
- Published applications
- 35
- Assignees
- 52
- Inventors
- 166
- Latest grant
- 23 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 3 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 3 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 6 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 4 | 0 |
| 2000 | 2 | 0 |
| 2001 | 5 | 2 |
| 2002 | 2 | 1 |
| 2003 | 3 | 4 |
| 2004 | 5 | 2 |
| 2005 | 1 | 0 |
| 2006 | 1 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 2 |
| 2009 | 1 | 1 |
| 2010 | 2 | 4 |
| 2011 | 1 | 0 |
| 2012 | 2 | 1 |
| 2013 | 0 | 1 |
| 2014 | 1 | 0 |
| 2015 | 0 | 2 |
| 2016 | 0 | 0 |
| 2017 | 1 | 3 |
| 2018 | 1 | 1 |
| 2019 | 0 | 0 |
| 2020 | 2 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 3 |
| 2025 | 2 | 4 |
| 2026 | 0 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Sustainable steel production with co-generation of hydrogen23 Dec 2025US 12,503,737 B2Saudi Arabian Oil Company
- Reactors and methods for production of sustainable chemicals using carbon emissions of metallurgical furnaces25 Mar 2025US 12,258,671 B2Dioxycle
- Production method for smelting clean steel from full-scrap steel using duplex electric arc furnaces8 Sep 2020US 10,767,239 B2Tangshan first Tang Baosheng functional materials Co., Ltd.
- Apparatus for heating and transferring metal materials for a melting plant, and method for melting metal materials25 Feb 2020US 10,571,194 B2Danieli Automation S.P.A.
- Fixed-type electric furnace and molten steel production method3 Apr 2018US 9,932,649 B2Posco
- Method for producing molten iron13 Aug 2026US 2026/0234740 A1Jfe Steel Corporation
- Method for producing molten iron6 Aug 2026US 2026/0226569 A1Jfe Steel Corporation
- Carbon Monoxide Electrolyzers used with Reverse Water Gas Shift Reactors for the Conversion of Carbon Dioxide into Added-Value Products16 Jul 2026US 2026/0201576 A1Dioxycle
- Method and apparatus for metals, alloys, mattes, or enriched and cleaned slags production from predominantly oxide feeds16 Oct 2025US 2025/0320570 A1Hertha Metals, Inc.
- Reactors and Methods for Production of Sustainable Chemicals using Carbon Emissions of Metallurgical Furnaces5 Jun 2025US 2025/0179661 A1Dioxycle
Most cited
By later US patents
- Smelting plant with two melting furnaces arranged in juxtaposed relationship15US 5,264,020 AFuchs Technology AG · 1993
- Process for making steel14US 3,955,964 AKoppers Company, Inc. · 1976
- Method for producing molten iron in duplex furnaces12US 6,582,491 B2Midrex International B.V. Rotterdam, Zurich Branch · 2003
- Integrated metallurgical reactor11US 5,060,913 ARegents of the University of Minnesota · 1991
- Method of producing molten iron in duplex furnaces11US 6,251,156 B1Midrex Technologies, Inc. · 2001