C21B 2100/284
Of nitrogen
Official title: of nitrogen
C21B2100/284 (Of nitrogen) appears on 18 US grants and 16 published applications in this corpus.
Search patents in C21B- Granted patents
- 18
- Published applications
- 16
- Assignees
- 21
- Inventors
- 50
- Latest grant
- 24 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 3 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 1 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 1 |
| 2020 | 0 | 1 |
| 2021 | 0 | 1 |
| 2022 | 2 | 3 |
| 2023 | 0 | 3 |
| 2024 | 1 | 4 |
| 2025 | 1 | 2 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- 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.
- Method of operating blast furnace and blast furnace ancillary facility22 Jul 2025US 12,365,953 B2Jfe Steel Corporation
- Oxygen injection for reformer feed gas for direct reduction process5 Mar 2024US 11,920,204 B2Midrex Technologies, Inc.
- Direct reduction process utilizing hydrogen15 Nov 2022US 11,499,201 B2Midrex Technologies, Inc.
- Method for off-gas composition control in a metal smelting apparatus19 Jul 2022US 11,390,926 B2Tata Steel Nederland Technology B.V.
- Reduction of a metal oxide-containing material on the basis of ammonia nh326 Jun 2025US 2025/0207211 A1Primetals Technologies Austria GmbH
- Process and apparatus for separating waste gas from a ferrous metal production unit29 May 2025US 2025/0170521 A1L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Process and a system for the production of sponge iron from iron ore19 Sep 2024US 2024/0309476 A1HYBRIT Development AB
- Hydrogen gas recycling in a direct reduction process22 Aug 2024US 2024/0279759 A1HYBRIT Development AB
- Direct reduced iron system and method using synthetic combustion air4 Jul 2024US 2024/0218474 A1Nucor Corporation
Most cited
By later US patents
- Use of nitrogen from an air separation plant in carbon dioxide removal from a feed gas to a further process25US 5,582,029 AAir Products and Chemicals, Inc. · 1996
- Production of reducing gas for furnace injection22US 4,363,654 A1982
- Process for removing a nitrogen gas from mixture comprising N.sub.2 and CO or N.sub.2 ' CO.sub.2 and CO19US 4,468,238 AKawasaki Steel Corporation · 1984
- Method for integrating a blast furnace and a direct reduction reactor using cryogenic rectification19US 6,045,602 APraxair Technology, Inc. · 2000
- Process for producing pig iron14US 4,913,733 AKorf Engineering GmbH (now Deutsche Voest-Alpine Industrieanlagenbau GmbH) · 1990