C21B 2100/28
By separation
Official title: by separation
C21B2100/28 (By separation) appears on 206 US grants and 169 published applications in this corpus.
Search patents in C21B- Granted patents
- 206
- Published applications
- 169
- Assignees
- 114
- Inventors
- 420
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 9 | 0 |
| 1978 | 5 | 0 |
| 1979 | 4 | 0 |
| 1980 | 6 | 0 |
| 1981 | 3 | 0 |
| 1982 | 7 | 0 |
| 1983 | 1 | 0 |
| 1984 | 5 | 0 |
| 1985 | 6 | 0 |
| 1986 | 7 | 0 |
| 1987 | 2 | 0 |
| 1988 | 3 | 0 |
| 1989 | 4 | 0 |
| 1990 | 4 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 3 | 0 |
| 1996 | 5 | 0 |
| 1997 | 2 | 0 |
| 1998 | 1 | 0 |
| 1999 | 10 | 0 |
| 2000 | 7 | 0 |
| 2001 | 7 | 0 |
| 2002 | 3 | 0 |
| 2003 | 1 | 1 |
| 2004 | 0 | 1 |
| 2005 | 0 | 2 |
| 2006 | 1 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 3 |
| 2010 | 2 | 8 |
| 2011 | 4 | 8 |
| 2012 | 3 | 14 |
| 2013 | 7 | 7 |
| 2014 | 9 | 15 |
| 2015 | 11 | 10 |
| 2016 | 8 | 12 |
| 2017 | 8 | 3 |
| 2018 | 9 | 3 |
| 2019 | 4 | 1 |
| 2020 | 2 | 1 |
| 2021 | 3 | 4 |
| 2022 | 2 | 11 |
| 2023 | 2 | 13 |
| 2024 | 5 | 22 |
| 2025 | 8 | 16 |
| 2026 | 5 | 12 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Process for the production of carburized sponge iron28 Jul 2026US 12,692,563 B2HYBRIT Development AB
- Method for producing reduced iron7 Apr 2026US 12,595,522 B2Nippon Steel Corporation
- Gas production apparatus, gas production system, steel production system, chemical manufacturing system, and gas production method with reduced carbon dioxide emission24 Mar 2026US 12,582,941 B2Sekisui Chemical Co., Ltd.
- Steelmaking line and method of producing reduced iron27 Jan 2026US 12,534,770 B2Jfe Steel Corporation
- Solid carbon production device and solid carbon production method20 Jan 2026US 12,528,701 B2Mitsubishi Heavy Industries, Ltd.
- Method of producing reduced iron8 Oct 2026US 2026/0308705 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
- Method of producing reduced iron16 Jul 2026US 2026/0201485 A1Jfe Steel Corporation
- Method of producing reduced iron16 Jul 2026US 2026/0201486 A1Jfe Steel Corporation
- Carbon dioxide capture, carbon resource utilization, and hydrogen production system for steel mill2 Jul 2026US 2026/0183700 A1Lowcarbon Co., Ltd.
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
- Process for production of elemental iron82US 7,931,731 B2Shell Oil Company · 2011
- Production of carbon monoxide by the gasification of carbonaceous materials78US 4,265,868 AKoppers Company, Inc. · 1981
- Blast furnace iron production with integrated power generation70US 8,133,298 B2Air Products and Chemicals, Inc. · 2012
- Method for the direct reduction of iron ore61US 4,160,663 A1979