C21B 13/12
In electric furnaces
Official title: in electric furnaces
C21B13/12 (In electric furnaces) appears on 175 US grants and 134 published applications in this corpus.
Search patents in C21B- Granted patents
- 175
- Published applications
- 134
- Assignees
- 136
- Inventors
- 445
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 8 | 0 |
| 1977 | 5 | 0 |
| 1978 | 7 | 0 |
| 1979 | 4 | 0 |
| 1980 | 3 | 0 |
| 1981 | 2 | 0 |
| 1982 | 4 | 0 |
| 1983 | 4 | 0 |
| 1984 | 6 | 0 |
| 1985 | 7 | 0 |
| 1986 | 4 | 0 |
| 1987 | 8 | 0 |
| 1988 | 8 | 0 |
| 1989 | 3 | 0 |
| 1990 | 2 | 0 |
| 1991 | 3 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 3 | 0 |
| 1995 | 3 | 0 |
| 1996 | 4 | 0 |
| 1997 | 2 | 0 |
| 1998 | 1 | 0 |
| 1999 | 3 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 2 |
| 2002 | 4 | 1 |
| 2003 | 2 | 1 |
| 2004 | 2 | 2 |
| 2005 | 0 | 1 |
| 2006 | 0 | 1 |
| 2007 | 2 | 3 |
| 2008 | 1 | 3 |
| 2009 | 1 | 2 |
| 2010 | 1 | 5 |
| 2011 | 2 | 2 |
| 2012 | 3 | 6 |
| 2013 | 6 | 2 |
| 2014 | 1 | 2 |
| 2015 | 3 | 4 |
| 2016 | 2 | 5 |
| 2017 | 2 | 2 |
| 2018 | 3 | 3 |
| 2019 | 3 | 4 |
| 2020 | 6 | 6 |
| 2021 | 3 | 6 |
| 2022 | 5 | 8 |
| 2023 | 4 | 16 |
| 2024 | 7 | 14 |
| 2025 | 8 | 10 |
| 2026 | 6 | 23 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Wire rod for 5000 MPa-grade diamond wire and production method therefor15 Sep 2026US 12,735,763 B2Institute of Research of Iron and Steel, Jiangsu Province/Sha-Steel, Co. Ltd (Cn)
- Method for producing liquid pig iron from a DRI product25 Aug 2026US 12,716,105 B2SMS group GmbH
- Systems and methods for steel production14 Apr 2026US 12,601,020 B2Pathfinder Holdings Corp.
- Method for producing reduced form of metal oxides14 Apr 2026US 12,601,030 B2K.K. Sun Metalon
- Method of operating an electric arc furnace and steel mill24 Mar 2026US 12,584,182 B2Paul Wurth S. A.
- Novel process for the smelting of a blend of hot and cold metalliferous feedstock material yielding reduced carbon emissions1 Oct 2026US 2026/0297695 A1Metix (Proprietary) Limited
- Method for melting iron source1 Oct 2026US 2026/0297697 A1Nippon Steel Corporation
- Method for refining metal27 Aug 2026US 2026/0250795 A1Ferrum Technologies FlexCo
- Method for producing molten iron6 Aug 2026US 2026/0226569 A1Jfe Steel Corporation
- Systems and methods for steel production23 Jul 2026US 2026/0209872 A1Pathfinder Holdings Corp.
Most cited
By later US patents
- Plasma fired feed nozzle32US 4,761,793 AElectric Power Research Institute, Inc. · 1988
- Method for the melting, combustion or incineration of materials and apparatus therefor29US 5,548,611 ASchuller International, Inc. · 1996
- Process for producing an iron melt26US 5,611,838 AVoest-Alpine Industrieanlagenbau GmbH · 1997
- Method of, and arrangement for, producing molten pig iron or steel pre-material22US 4,396,421 AKorf-Stahl AG · 1983
- Method and apparatus for controlling bath level and measurement of bath characteristics19US 6,004,504 ATechint Compagnia Tecnica Internazionale S.p.A. · 1999