C01B 21/02
Preparation of nitrogen
Official title: Preparation of nitrogen (by decomposition of ammonia C01B3/047)
C01B21/02 (Preparation of nitrogen) appears on 98 US grants and 80 published applications in this corpus.
Search patents in C01B- Granted patents
- 98
- Published applications
- 80
- Assignees
- 87
- Inventors
- 274
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 8 | 0 |
| 1978 | 7 | 0 |
| 1979 | 2 | 0 |
| 1980 | 3 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 4 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 3 | 0 |
| 1996 | 4 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 1 |
| 2003 | 1 | 1 |
| 2004 | 0 | 2 |
| 2005 | 2 | 2 |
| 2006 | 1 | 0 |
| 2007 | 1 | 2 |
| 2008 | 0 | 2 |
| 2009 | 2 | 1 |
| 2010 | 2 | 5 |
| 2011 | 0 | 2 |
| 2012 | 1 | 5 |
| 2013 | 4 | 2 |
| 2014 | 3 | 4 |
| 2015 | 5 | 0 |
| 2016 | 1 | 2 |
| 2017 | 1 | 6 |
| 2018 | 1 | 6 |
| 2019 | 4 | 1 |
| 2020 | 2 | 3 |
| 2021 | 5 | 6 |
| 2022 | 5 | 8 |
| 2023 | 2 | 6 |
| 2024 | 3 | 1 |
| 2025 | 3 | 9 |
| 2026 | 2 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Catalytic decomposition reactors28 Jul 2026US 12,692,824 B2Firehawk Aerospace, Inc.
- Metal-metal bonded ammonia oxidation catalysts6 Jan 2026US 12,515,207 B2Wisconsin Alumni Research Foundation
- Regenerated denitration catalyst and method for manufacturing the same, and denitration apparatus30 Sep 2025US 12,427,509 B2Mitsubishi Heavy Industries, Ltd.
- Catalytic decomposition reactors9 Sep 2025US 12,410,765 B2Firehawk Aerospace, Inc.
- Method to convert excess liquid oxygen into liquid nitrogen20 May 2025US 12,305,916 B2Airgas, Inc.
- Chemical Looping Process for the Production of CO from CO230 Jul 2026US 2026/0217541 A1Nederlandse Organisatie voor toegepast-natuurwetenschappelijk onderzoek TNO
- METHOD & APPARATUS FOR Solar Nitrogen Fixation Container Farms19 Mar 2026US 2026/0078002 A1Lewa Farm Tech, Inc
- Catalytic decomposition reactors1 Jan 2026US 2026/0002496 A1Firehawk Aerospace, Inc.
- Method for ammonia decomposition using carbon material supported metal catalyst25 Dec 2025US 2025/0387779 A1King Abdullah University of Science and Technology
- Controlled reaction rates of thermochemical fluids using emulsions25 Dec 2025US 2025/0388521 A1King Fahd University of Petroleum and Minerals
Most cited
By later US patents
- Nitrogen injection96US 4,895,710 A1990
- Solid non-azide nitrogen gas generant compositions84US 4,369,079 AThiokol Corporation · 1983
- Ion transport membranes with catalyzed mixed conducting porous layer73US 5,534,471 AAir Products and Chemicals, Inc. · 1996
- Process of converting ethylbenzene to styrene using a graphite nanocatalysts72US 7,307,195 B2Catalytic Materials, LLC · 2007
- Ion transport membranes with catalyzed dense layer60US 5,569,633 AAir Products and Chemicals, Inc. · 1996