C21C 5/04
Manufacture of hearth-furnace steel
Official title: Manufacture of hearth-furnace steel, e.g. Siemens-Martin steel {(C21C5/005 takes precedence)}
C21C5/04 (Manufacture of hearth-furnace steel) appears on 17 US grants and 7 published applications in this corpus.
Search patents in C21C- Granted patents
- 17
- Published applications
- 7
- Assignees
- 11
- Inventors
- 24
- Latest grant
- 10 Jan 2023
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 3 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 1 |
| 2010 | 1 | 0 |
| 2011 | 1 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 1 |
| 2015 | 0 | 1 |
| 2016 | 1 | 0 |
| 2017 | 1 | 0 |
| 2018 | 0 | 1 |
| 2019 | 0 | 0 |
| 2020 | 1 | 1 |
| 2021 | 0 | 1 |
| 2022 | 0 | 0 |
| 2023 | 1 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Smelting assembly for the production of steel10 Jan 2023US 11,549,156 B2SMS group GmbH
- Sonic injection furnace16 Jun 2020US 10,683,225 B2Saint-Gobain Glass France
- Starting a smelting process26 Sep 2017US 9,771,626 B2Technological Resources Pty. Limited
- Starting a smelting process4 Oct 2016US 9,458,518 B2Technological Resources Pty. Limited
- Cold start-up method for a direct smelting process29 Mar 2011US 7,914,601 B2Technological Resources Pty. Limited
- Smelting assembly for the production of steel11 Feb 2021US 2021/0040573 A1SMS group GmbH
- Sonic injection furnace20 Aug 2020US 2020/0262732 A1Saint-Gobain Glass France
- Sonic injection furnace21 Jun 2018US 2018/0170786 A1Saint-Gobain Glass France
- Starting a smelting process17 Sep 2015US 2015/0259758 A1Technological Resources Pty. Limited
- Starting a smelting process30 Oct 2014US 2014/0318319 A1Technological Resources Pty. Limited
Most cited
By later US patents
- Cold start-up method for a direct smelting process36US 7,914,601 B2Technological Resources Pty. Limited · 2011
- Metallurgical melting and refining unit33US 4,389,043 AKorf Industrie und Handel GmbH und Co KG · 1983
- Process and immersion lances for introducing oxygen into a metal melt11US 3,945,820 AEisenwerk-Gesellschaft Maximilianshutte mbH · 1976
- Direct-fired stratified atmosphere furnace system9US 5,609,481 APraxair Technology, Inc. · 1997
- Method of manufacturing pig iron or steel and cement clinker from slags8US 5,944,870 A"Holderbank" Financiere Glarus AG · 1999