C21C 5/56
Manufacture of steel by other methods
Official title: Manufacture of steel by other methods (making liquid steel by direct processes C21B13/00 {; C21C5/005 takes precedence})
C21C5/56 (Manufacture of steel by other methods) appears on 444 US grants and 236 published applications in this corpus.
Search patents in C21C- Granted patents
- 444
- Published applications
- 236
- Assignees
- 228
- Inventors
- 861
- Latest grant
- 7 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 15 | 0 |
| 1977 | 10 | 0 |
| 1978 | 10 | 0 |
| 1979 | 2 | 0 |
| 1980 | 2 | 0 |
| 1981 | 7 | 0 |
| 1982 | 4 | 0 |
| 1983 | 10 | 0 |
| 1984 | 11 | 0 |
| 1985 | 11 | 0 |
| 1986 | 13 | 0 |
| 1987 | 12 | 0 |
| 1988 | 8 | 0 |
| 1989 | 11 | 0 |
| 1990 | 12 | 0 |
| 1991 | 15 | 0 |
| 1992 | 5 | 0 |
| 1993 | 9 | 0 |
| 1994 | 12 | 0 |
| 1995 | 12 | 0 |
| 1996 | 16 | 0 |
| 1997 | 10 | 0 |
| 1998 | 1 | 0 |
| 1999 | 12 | 0 |
| 2000 | 11 | 0 |
| 2001 | 11 | 5 |
| 2002 | 19 | 9 |
| 2003 | 11 | 8 |
| 2004 | 5 | 11 |
| 2005 | 6 | 8 |
| 2006 | 1 | 20 |
| 2007 | 8 | 11 |
| 2008 | 5 | 13 |
| 2009 | 13 | 26 |
| 2010 | 16 | 13 |
| 2011 | 14 | 8 |
| 2012 | 16 | 10 |
| 2013 | 10 | 8 |
| 2014 | 4 | 5 |
| 2015 | 6 | 8 |
| 2016 | 4 | 10 |
| 2017 | 7 | 8 |
| 2018 | 8 | 4 |
| 2019 | 5 | 1 |
| 2020 | 8 | 4 |
| 2021 | 3 | 2 |
| 2022 | 1 | 9 |
| 2023 | 8 | 9 |
| 2024 | 7 | 10 |
| 2025 | 3 | 5 |
| 2026 | 4 | 11 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Apparatus for the production of molten iron7 Apr 2026US 12,595,520 B2Tata Steel Ijmuiden B.V.
- Joint regulation method of material flow, energy flow, and carbon emission flow in long-process iron and steel enterprises10 Mar 2026US 12,571,060 B2Northeast Electric Power University
- Process for producing raw steel and aggregate for production thereof10 Mar 2026US 12,571,062 B2ThyssenKrupp Steel Europe AG
- Method of producing molten iron using electric furnace including video device3 Mar 2026US 12,566,029 B2Jfe Steel Corporation
- Process and plant for preheating a metal charge fed in continuous to an electric melting furnace15 Jul 2025US 12,359,873 B2
- Novel process for the smelting of a metalliferous feedstock material yielding reduced carbon emissions1 Oct 2026US 2026/0297698 A1Metix (Proprietary) Limited
- A bainite seamless steel pipe and manufacturing method therefor3 Sep 2026US 2026/0258534 A1Baoshan Iron & Steel Co., Ltd.
- Method for refining metal27 Aug 2026US 2026/0250795 A1Ferrum Technologies FlexCo
- Method for producing molten iron6 Aug 2026US 2026/0226569 A1Jfe Steel Corporation
- System to produce green steel through electric arc furnace with very low ghg emission intensity16 Jul 2026US 2026/0201487 A1Saarloha Advanced Materials Private Limited
Most cited
By later US patents
- Method for injecting feed streams into a molten bath112US 5,858,059 AMolten Metal Technology, Inc. · 1999
- Process for the production of steel from fine ore hot briquetted after fluidized bed reduction49US 4,946,498 A1990
- Method and apparatus for producing reformed gases48US 6,524,356 B2Midrex Technologies, Inc. · 2003
- Method for two-stage melt reduction of iron ore43US 4,849,015 AKloeckner CRA Technologie GmbH · 1989
- Direct smelting vessel and direct smelting process43US 6,322,745 B1Technological Resources Pty. Limited · 2001