C21B 13/14
Multi-stage processes processes carried out in different vessels or furnaces
Official title: Multi-stage processes {processes carried out in different vessels or furnaces}
C21B13/14 (Multi-stage processes processes carried out in different vessels or furnaces) appears on 399 US grants and 222 published applications in this corpus.
Search patents in C21B- Granted patents
- 399
- Published applications
- 222
- Assignees
- 189
- Inventors
- 706
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 11 | 0 |
| 1977 | 8 | 0 |
| 1978 | 7 | 0 |
| 1979 | 3 | 0 |
| 1980 | 3 | 0 |
| 1981 | 8 | 0 |
| 1982 | 5 | 0 |
| 1983 | 4 | 0 |
| 1984 | 6 | 0 |
| 1985 | 5 | 0 |
| 1986 | 7 | 0 |
| 1987 | 6 | 0 |
| 1988 | 4 | 0 |
| 1989 | 20 | 0 |
| 1990 | 10 | 0 |
| 1991 | 12 | 0 |
| 1992 | 6 | 0 |
| 1993 | 12 | 0 |
| 1994 | 6 | 0 |
| 1995 | 16 | 0 |
| 1996 | 12 | 0 |
| 1997 | 7 | 0 |
| 1998 | 7 | 0 |
| 1999 | 15 | 0 |
| 2000 | 13 | 0 |
| 2001 | 36 | 3 |
| 2002 | 16 | 10 |
| 2003 | 10 | 7 |
| 2004 | 3 | 7 |
| 2005 | 6 | 9 |
| 2006 | 2 | 7 |
| 2007 | 5 | 6 |
| 2008 | 3 | 11 |
| 2009 | 6 | 11 |
| 2010 | 12 | 9 |
| 2011 | 9 | 15 |
| 2012 | 10 | 12 |
| 2013 | 10 | 2 |
| 2014 | 5 | 13 |
| 2015 | 10 | 18 |
| 2016 | 9 | 8 |
| 2017 | 5 | 2 |
| 2018 | 5 | 4 |
| 2019 | 5 | 1 |
| 2020 | 4 | 0 |
| 2021 | 2 | 5 |
| 2022 | 2 | 5 |
| 2023 | 1 | 13 |
| 2024 | 1 | 17 |
| 2025 | 6 | 12 |
| 2026 | 3 | 15 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method for producing liquid pig iron from a DRI product25 Aug 2026US 12,716,105 B2SMS group GmbH
- Process for the production of carburized sponge iron28 Jul 2026US 12,692,563 B2HYBRIT Development AB
- Method of introducing a metalliferous feed in an ironmaking process19 May 2026US 12,630,892 B2Tata Steel Ijmuiden B.V.
- Hot metal production from DRI with electric arc heating16 Dec 2025US 12,497,668 B2Kobe Steel, Ltd.
- System for processing red mud and method of processing red mud22 Jul 2025US 12,365,954 B2Red Mud Enterprises LLC
- Direct reduction system and method utilizing pre-reducing furnace and heat exchanger10 Sep 2026US 2026/0265849 A1Midrex Technologies, Inc.
- Method for producing molten iron6 Aug 2026US 2026/0226569 A1Jfe Steel Corporation
- Process of direct reduction of iron ores by means of synthesis gas produced with catalytic partial oxidation6 Aug 2026US 2026/0226570 A1
- Carbon dioxide capture, carbon resource utilization, and hydrogen production system for steel mill2 Jul 2026US 2026/0183700 A1Lowcarbon Co., Ltd.
- A method for manufacturing pig iron in an electrical smelting furnace and associated furnace25 Jun 2026US 2026/0176708 A1
Most cited
By later US patents
- Method and system for energy-optimized and CO2 emission-optimized iron production101US 8,419,825 B2Siemens Vai Metals Technologies GmbH · 2013
- Valve for aerosol container91US 6,170,717 B2Glaxo Wellcome Inc. · 2001
- Valve for aerosol container77US 6,510,969 B2SmithKline Beecham Corporation · 2003
- Method of producing iron using rotary hearth and apparatus73US 4,701,214 AMidrex International B.V. Rotterdam · 1987
- Valve for aerosol container73US 6,315,173 B1SmithKline Beecham Corporation · 2001