C21C 5/5229
In a direct current [dc] electric arc furnace
Official title: {in a direct current [DC] electric arc furnace}
C21C5/5229 (In a direct current [dc] electric arc furnace) appears on 162 US grants and 31 published applications in this corpus.
Search patents in C21C- Granted patents
- 162
- Published applications
- 31
- Assignees
- 88
- Inventors
- 262
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 5 | 0 |
| 1978 | 6 | 0 |
| 1979 | 4 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 4 | 0 |
| 1983 | 2 | 0 |
| 1984 | 7 | 0 |
| 1985 | 6 | 0 |
| 1986 | 14 | 0 |
| 1987 | 11 | 0 |
| 1988 | 4 | 0 |
| 1989 | 5 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 5 | 0 |
| 1993 | 9 | 0 |
| 1994 | 7 | 0 |
| 1995 | 11 | 0 |
| 1996 | 11 | 0 |
| 1997 | 4 | 0 |
| 1998 | 6 | 0 |
| 1999 | 4 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 0 |
| 2002 | 3 | 0 |
| 2003 | 0 | 0 |
| 2004 | 2 | 1 |
| 2005 | 0 | 1 |
| 2006 | 0 | 0 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 1 |
| 2014 | 0 | 3 |
| 2015 | 2 | 4 |
| 2016 | 2 | 4 |
| 2017 | 4 | 1 |
| 2018 | 3 | 0 |
| 2019 | 2 | 1 |
| 2020 | 0 | 1 |
| 2021 | 0 | 1 |
| 2022 | 0 | 1 |
| 2023 | 0 | 2 |
| 2024 | 1 | 4 |
| 2025 | 0 | 4 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Direct current electric arc furnace22 Sep 2026US 12,742,218 B2Masercata Oy
- Process for producing raw steel and aggregate for production thereof10 Mar 2026US 12,571,062 B2ThyssenKrupp Steel Europe AG
- Method for smelting low nitrogen steel using electric furnace25 Jun 2024US 12,018,341 B2Baoshan Iron & Steel Co., Ltd.
- Method for making steel in an electric arc furnace and electric arc furnace2 Jul 2019US 10,337,077 B2
- Production method for maraging steel and production method for maraging steel consumable electrode11 Jun 2019US 10,316,377 B2Hitachi Metals, Ltd.
- Anode for direct current electric arc furnace25 Dec 2025US 2025/0393105 A1HarbisonWalker International Holdings, Inc.
- Dual electrode dc electric arc melter11 Dec 2025US 2025/0377163 A1
- Dual electrode dc arc furnace13 Nov 2025US 2025/0347465 A1
- A system and method for bottom electrode compound bottom blowing of multi-media of DC electric arc furnace23 Oct 2025US 2025/0327143 A1Cisdi Thermal & Environmental Engineering Co., Ltd
- Molten pig iron manufacturing method7 Nov 2024US 2024/0368716 A1Nippon Steel Corporation
Most cited
By later US patents
- Direct current electric arc furnace34US 5,526,374 AMannesmann Aktiengesellschaft · 1996
- Flicker compensating apparatus for DC arc furnace25US 5,155,740 ANKK Corporation · 1992
- Electric arc furnace hearth connection24US 4,125,737 AASEA Aktiebolag · 1978
- Power supply circuit for a direct current arc furnace21US 4,461,010 AElectro-Petroleum, Inc. · 1984
- Direct current-electric arc furnace system21US 5,438,588 AABB Management AG · 1995