C21B 2100/66
Heat exchange
C21B2100/66 (Heat exchange) appears on 212 US grants and 145 published applications in this corpus.
Search patents in C21B- Granted patents
- 212
- Published applications
- 145
- Assignees
- 122
- Inventors
- 448
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 11 | 0 |
| 1978 | 4 | 0 |
| 1979 | 3 | 0 |
| 1980 | 6 | 0 |
| 1981 | 5 | 0 |
| 1982 | 5 | 0 |
| 1983 | 1 | 0 |
| 1984 | 3 | 0 |
| 1985 | 1 | 0 |
| 1986 | 3 | 0 |
| 1987 | 1 | 0 |
| 1988 | 6 | 0 |
| 1989 | 5 | 0 |
| 1990 | 3 | 0 |
| 1991 | 3 | 0 |
| 1992 | 4 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 6 | 0 |
| 1996 | 8 | 0 |
| 1997 | 4 | 0 |
| 1998 | 4 | 0 |
| 1999 | 8 | 0 |
| 2000 | 6 | 0 |
| 2001 | 12 | 1 |
| 2002 | 6 | 2 |
| 2003 | 2 | 1 |
| 2004 | 0 | 4 |
| 2005 | 2 | 1 |
| 2006 | 2 | 2 |
| 2007 | 2 | 1 |
| 2008 | 0 | 2 |
| 2009 | 0 | 10 |
| 2010 | 0 | 7 |
| 2011 | 7 | 7 |
| 2012 | 6 | 7 |
| 2013 | 5 | 5 |
| 2014 | 6 | 13 |
| 2015 | 10 | 7 |
| 2016 | 5 | 6 |
| 2017 | 7 | 0 |
| 2018 | 2 | 5 |
| 2019 | 5 | 1 |
| 2020 | 5 | 3 |
| 2021 | 0 | 2 |
| 2022 | 2 | 8 |
| 2023 | 1 | 13 |
| 2024 | 5 | 18 |
| 2025 | 10 | 10 |
| 2026 | 4 | 9 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Process for the production of carburized sponge iron28 Jul 2026US 12,692,563 B2HYBRIT Development AB
- Method and device for producing direct reduced metal7 Apr 2026US 12,595,521 B2Greeniron H2 AB
- Method for producing reduced iron7 Apr 2026US 12,595,522 B2Nippon Steel Corporation
- Hydrogen release/storage system, hydrogen release/storage method, ammonia production equipment, gas turbine, fuel cell, and steel mill24 Mar 2026US 12,582,953 B2Mitsubishi Heavy Industries, Ltd.
- Hydrogen release and storage system, hydrogen release and storage method, ammonia production apparatus, gas turbine, fuel cell, and steel mill23 Dec 2025US 12,503,362 B2Mitsubishi Heavy Industries, Ltd.
- Plant and mehtod for the production of direct reduced iron10 Sep 2026US 2026/0265847 A1Danieli & C. Officine Meccaniche SpA
- Cooling gas recirculation in the upper reduction zone of a direct reduction shaft furnace10 Sep 2026US 2026/0265848 A1Midrex Technologies, Inc.
- Direct reduction system and method utilizing pre-reducing furnace and heat exchanger10 Sep 2026US 2026/0265849 A1Midrex Technologies, Inc.
- Method for manufacturing direct reduced iron with a low carbon content2 Jul 2026US 2026/0185172 A1
- Management of offgas duct accretions in a smelting process30 Apr 2026US 2026/0117331 A1Nucor Corporation
Most cited
By later US patents
- Production of carbon monoxide by the gasification of carbonaceous materials78US 4,265,868 AKoppers Company, Inc. · 1981
- Method for producing molten iron by submerged combustion69US 4,238,226 AMidrex Corporation · 1980
- Apparatus for producing molten iron by submerged combustion67US 4,270,740 AMidrex Corporation · 1981
- Method for the direct reduction of iron ore61US 4,160,663 A1979
- System and method for reducing iron oxide to metallic iron using coke oven gas and oxygen steelmaking furnace gas49US 8,685,136 B2Midrex Technologies, Inc. · 2014