C21C 7/0087
Treatment of slags covering the steel bath
Official title: {Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal}
C21C7/0087 (Treatment of slags covering the steel bath) appears on 61 US grants and 76 published applications in this corpus.
Search patents in C21C- Granted patents
- 61
- Published applications
- 76
- Assignees
- 69
- Inventors
- 294
- Latest grant
- 21 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 3 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 3 | 0 |
| 2002 | 1 | 1 |
| 2003 | 1 | 3 |
| 2004 | 0 | 1 |
| 2005 | 2 | 2 |
| 2006 | 0 | 2 |
| 2007 | 0 | 2 |
| 2008 | 0 | 1 |
| 2009 | 0 | 3 |
| 2010 | 1 | 3 |
| 2011 | 7 | 4 |
| 2012 | 1 | 2 |
| 2013 | 2 | 2 |
| 2014 | 2 | 7 |
| 2015 | 1 | 6 |
| 2016 | 6 | 4 |
| 2017 | 2 | 5 |
| 2018 | 1 | 5 |
| 2019 | 4 | 3 |
| 2020 | 1 | 1 |
| 2021 | 2 | 3 |
| 2022 | 0 | 0 |
| 2023 | 4 | 7 |
| 2024 | 2 | 6 |
| 2025 | 2 | 2 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Ultra-high phosphorus molten iron low-cost smelting method for polar steel21 Apr 2026US 12,606,877 B2Laiwu Steel Yinshan Section Co., Ltd.
- Method for controlling nitrogen in steelmaking by spraying hydrogen containing plasma25 Feb 2025US 12,234,521 B2Hbzx High Tech Co., Ltd.
- Degassing method for manufacturing steel18 Feb 2025US 12,227,813 B2United States Steel Corporation
- Degassing method for manufacturing ultra-low carbon, nitrogen, sulfur steel17 Dec 2024US 12,168,808 B2United States Steel Corporation
- Method for smelting low-phosphorus high-manganese steel based on reduction dephosphorization of ferromanganese27 Aug 2024US 12,071,681 B2North China University of Science and Technology
- Method for refining metal27 Aug 2026US 2026/0250795 A1Ferrum Technologies FlexCo
- Degassing method for manufacturing steel12 Jun 2025US 2025/0188555 A1United States Steel Corporation
- Degassing method for manufacturing ultra-low carbon, nitrogen, sulfur steel6 Feb 2025US 2025/0043372 A1United States Steel Corporation
- Method for controlling nitrogen in steelmaking by spraying hydrogen containing plasma5 Dec 2024US 2024/0401161 A1Hbzx High Tech Co., Ltd.
- Method for producing slag having a desired quality14 Nov 2024US 2024/0376559 A1ThyssenKrupp Steel Europe AG
Most cited
By later US patents
- Direct smelting process32US 6,478,848 B1Technological Resources Pty. Limited · 2002
- Utilization of strontium aluminate in steelmaking19US 6,051,049 AExothermic Distribution Corporation · 2000
- Controlling dissolved oxygen content in molten steel16US 4,746,361 AInland Steel Company · 1988
- Ladle refining of steel14US 6,547,849 B2Nucor Corporation · 2003
- Compositions for synthesizing ladle slags13US 5,279,639 ATam Ceramics, Inc. · 1994