C21C 7/00
Treating molten ferrous alloys
Official title: Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 (treating molten metals during moulding B22D1/00, B22D27/00)
C21C7/00 (Treating molten ferrous alloys) appears on 1,368 US grants and 876 published applications in this corpus.
Search patents in C21C- Granted patents
- 1,368
- Published applications
- 876
- Assignees
- 691
- Inventors
- 3,344
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 46 | 0 |
| 1977 | 46 | 0 |
| 1978 | 37 | 0 |
| 1979 | 43 | 0 |
| 1980 | 45 | 0 |
| 1981 | 38 | 0 |
| 1982 | 26 | 0 |
| 1983 | 38 | 0 |
| 1984 | 32 | 0 |
| 1985 | 42 | 0 |
| 1986 | 35 | 0 |
| 1987 | 43 | 0 |
| 1988 | 42 | 0 |
| 1989 | 46 | 0 |
| 1990 | 34 | 0 |
| 1991 | 15 | 0 |
| 1992 | 17 | 0 |
| 1993 | 21 | 0 |
| 1994 | 27 | 0 |
| 1995 | 17 | 0 |
| 1996 | 16 | 0 |
| 1997 | 17 | 0 |
| 1998 | 19 | 0 |
| 1999 | 22 | 0 |
| 2000 | 20 | 0 |
| 2001 | 18 | 6 |
| 2002 | 35 | 12 |
| 2003 | 18 | 22 |
| 2004 | 19 | 30 |
| 2005 | 12 | 19 |
| 2006 | 8 | 27 |
| 2007 | 9 | 31 |
| 2008 | 8 | 29 |
| 2009 | 20 | 31 |
| 2010 | 22 | 41 |
| 2011 | 32 | 41 |
| 2012 | 28 | 33 |
| 2013 | 20 | 23 |
| 2014 | 25 | 37 |
| 2015 | 27 | 40 |
| 2016 | 25 | 43 |
| 2017 | 29 | 36 |
| 2018 | 19 | 29 |
| 2019 | 28 | 35 |
| 2020 | 23 | 21 |
| 2021 | 19 | 25 |
| 2022 | 23 | 36 |
| 2023 | 20 | 57 |
| 2024 | 26 | 60 |
| 2025 | 48 | 64 |
| 2026 | 23 | 48 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- C21C 7/04Removing impurities by adding a treating agent762
- C21C 7/10Handling in a vacuum254
- C21C 7/0006Adding metallic additives159
- C21C 7/0037Treating molten ferrous alloys: by injecting powdered material156
- C21C 7/0056Treating molten ferrous alloys: using cored wires130
- C21C 7/0075Treating in a ladle furnace126
- C21C 7/0025Adding carbon material63
- C21C 7/0087Treatment of slags covering the steel bath61
Recent patents
- Direct current electric arc furnace22 Sep 2026US 12,742,218 B2Masercata Oy
- Non-oriented electrical steel sheet, method for producing same, and hot-rolled steel sheet22 Sep 2026US 12,742,223 B2Nippon Steel Corporation
- Method for desulfurizing molten metal21 Jul 2026US 12,686,895 B2Jfe Steel Corporation
- Converter steelmaking method23 Jun 2026US 12,662,712 B2Jfe Steel Corporation
- Method for producing chromium-containing molten steel16 Jun 2026US 12,655,488 B2Jfe Steel Corporation
- 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
- Novel process for the smelting of a metalliferous feedstock material yielding reduced carbon emissions1 Oct 2026US 2026/0297698 A1Metix (Proprietary) Limited
- Method for producing molten steel1 Oct 2026US 2026/0297699 A1Jfe Steel Corporation
- Apparatus and method for refining liquid metal24 Sep 2026US 2026/0284739 A1Danieli & C. Officine Meccaniche SpA
- Production and preparation method of carburized gear shaft bars by means of converter process24 Sep 2026US 2026/0286458 A1Bengang Steel Plates Co., Ltd.
Most cited
By later US patents
- Apparatus for purifying molten metal140US 4,351,514 A1982
- Melting metal particles and dispersing gas with vaned impeller135US 5,143,357 AThe Carborundum Company · 1992
- Dispersing gas into molten metal131US 4,954,167 A1990
- Dispersing gas into molten metal130US 4,898,367 AStemcor Corporation · 1990
- Apparatus for generating a vortex in a melt127US 4,884,786 AGillespie & Powers, Inc. · 1989