C21B 11/08
In hearth-type furnaces
Official title: in hearth-type furnaces
C21B11/08 (In hearth-type furnaces) appears on 33 US grants and 44 published applications in this corpus.
Search patents in C21B- Granted patents
- 33
- Published applications
- 44
- Assignees
- 25
- Inventors
- 72
- Latest grant
- 7 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 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 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 1 |
| 2002 | 0 | 0 |
| 2003 | 1 | 1 |
| 2004 | 1 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 2 |
| 2007 | 0 | 0 |
| 2008 | 1 | 2 |
| 2009 | 0 | 8 |
| 2010 | 4 | 2 |
| 2011 | 3 | 1 |
| 2012 | 3 | 4 |
| 2013 | 4 | 4 |
| 2014 | 3 | 2 |
| 2015 | 0 | 4 |
| 2016 | 1 | 3 |
| 2017 | 2 | 3 |
| 2018 | 3 | 1 |
| 2019 | 2 | 0 |
| 2020 | 0 | 1 |
| 2021 | 0 | 1 |
| 2022 | 1 | 1 |
| 2023 | 1 | 1 |
| 2024 | 0 | 1 |
| 2025 | 0 | 0 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Apparatus for the production of molten iron7 Apr 2026US 12,595,520 B2Tata Steel Ijmuiden B.V.
- Smelting apparatus and metallurgical processes thereof25 Apr 2023US 11,635,257 B2NSGI Steel Inc.
- Method for off-gas composition control in a metal smelting apparatus19 Jul 2022US 11,390,926 B2Tata Steel Nederland Technology B.V.
- Production method of granular metallic iron10 Sep 2019US 10,407,744 B2Kobe Steel, Ltd.
- Direct smelting process7 May 2019US 10,280,489 B2Tata Steel Limited
- Coffee as a carbon source in the preparation of iron and ferro-alloys30 May 2024US 2024/0175100 A1NewSouth Innovations Pty Limited
- Smelting apparatus and metallurgical processes thereof5 Oct 2023US 2023/0314076 A1NSGI Steel Inc.
- Apparatus for the production of molten iron29 Dec 2022US 2022/0411888 A1Tata Steel Ijmuiden B.V.
- Method for off-gas composition control in a metal smelting apparatus11 Feb 2021US 2021/0040572 A1Tata Steel Nederland Technology B.V.
- Smelting apparatus and metallurgical processes thereof18 Jun 2020US 2020/0191481 A1NSGI Steel Inc.
Most cited
By later US patents
- High pressure dry coal slurry extrusion pump48US 7,717,046 B2Pratt & Whitney Rocketdyne, Inc. · 2010
- 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
- Method of manufacturing molten metal iron13US 6,569,223 B2MIDREX INTERNATIONAL B. V. Zurich Branch · 2003
- Furnace for melting solid ferrous pieces10US 4,033,562 AASEA Aktiebolag · 1977