C21B 11/00
Making pig-iron other than in blast furnaces
C21B11/00 (Making pig-iron other than in blast furnaces) appears on 196 US grants and 193 published applications in this corpus.
Search patents in C21B- Granted patents
- 196
- Published applications
- 193
- Assignees
- 145
- Inventors
- 511
- Latest grant
- 12 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 3 | 0 |
| 1978 | 5 | 0 |
| 1979 | 5 | 0 |
| 1980 | 2 | 0 |
| 1981 | 4 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 2 | 0 |
| 1990 | 3 | 0 |
| 1991 | 6 | 0 |
| 1992 | 3 | 0 |
| 1993 | 3 | 0 |
| 1994 | 3 | 0 |
| 1995 | 2 | 0 |
| 1996 | 5 | 0 |
| 1997 | 5 | 0 |
| 1998 | 3 | 0 |
| 1999 | 7 | 0 |
| 2000 | 3 | 0 |
| 2001 | 6 | 2 |
| 2002 | 6 | 3 |
| 2003 | 4 | 2 |
| 2004 | 1 | 4 |
| 2005 | 0 | 2 |
| 2006 | 1 | 5 |
| 2007 | 2 | 3 |
| 2008 | 3 | 6 |
| 2009 | 2 | 12 |
| 2010 | 4 | 9 |
| 2011 | 9 | 3 |
| 2012 | 8 | 7 |
| 2013 | 7 | 11 |
| 2014 | 4 | 8 |
| 2015 | 8 | 11 |
| 2016 | 7 | 7 |
| 2017 | 4 | 8 |
| 2018 | 7 | 6 |
| 2019 | 4 | 4 |
| 2020 | 4 | 5 |
| 2021 | 3 | 6 |
| 2022 | 7 | 8 |
| 2023 | 3 | 7 |
| 2024 | 4 | 13 |
| 2025 | 7 | 15 |
| 2026 | 5 | 26 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Agglomerated stone for use in an electric furnace12 May 2026US 12,624,405 B2ThyssenKrupp Steel Europe AG
- Systems and methods for steel production14 Apr 2026US 12,601,020 B2Pathfinder Holdings Corp.
- Apparatus for the production of molten iron7 Apr 2026US 12,595,520 B2Tata Steel Ijmuiden B.V.
- 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
- 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
- Method for producing molten pig iron17 Sep 2026US 2026/0275434 A1Jfe Steel Corporation
- A method for manufacturing molten pig iron into an electrical smelting furnace10 Sep 2026US 2026/0265845 A1
- Method for manufacturing pig iron in a production line comprising an electrical smelting furnace10 Sep 2026US 2026/0265850 A1
- A method of manufacturing molten pig iron into an electrical smelting unit3 Sep 2026US 2026/0258514 A1
Most cited
By later US patents
- Process of smelting with submerged burner80US 4,203,761 A1980
- High pressure dry coal slurry extrusion pump48US 7,717,046 B2Pratt & Whitney Rocketdyne, Inc. · 2010
- Direct smelting vessel and direct smelting process43US 6,322,745 B1Technological Resources Pty. Limited · 2001
- Direct smelting plant43US 8,562,903 B2Technological Resources Pty. Limited · 2013
- Cold start-up method for a direct smelting process36US 7,914,601 B2Technological Resources Pty. Limited · 2011