C01B 21/36
Nitrogen dioxide
Official title: Nitrogen dioxide (NO2, N2O4) ({C01B21/203} , C01B21/26, C01B21/30 take precedence)
C01B21/36 (Nitrogen dioxide) appears on 49 US grants and 39 published applications in this corpus.
Search patents in C01B- Granted patents
- 49
- Published applications
- 39
- Assignees
- 51
- Inventors
- 144
- Latest grant
- 3 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 3 | 0 |
| 1978 | 4 | 0 |
| 1979 | 3 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 1 |
| 2003 | 0 | 1 |
| 2004 | 2 | 1 |
| 2005 | 1 | 1 |
| 2006 | 0 | 2 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 1 | 0 |
| 2011 | 1 | 2 |
| 2012 | 0 | 1 |
| 2013 | 3 | 5 |
| 2014 | 1 | 1 |
| 2015 | 2 | 1 |
| 2016 | 0 | 1 |
| 2017 | 2 | 2 |
| 2018 | 0 | 1 |
| 2019 | 2 | 3 |
| 2020 | 2 | 1 |
| 2021 | 1 | 3 |
| 2022 | 2 | 1 |
| 2023 | 1 | 3 |
| 2024 | 2 | 1 |
| 2025 | 1 | 4 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Apparatus and process for conversion of ammonia into oxides of nitrogen3 Mar 2026US 12,565,427 B2Deepak Nitrite Limited
- Methods and systems for automatically generating a remedial action in an industrial facility7 Jan 2025US 12,190,701 B2Suncoke Technology and Development LLC
- Method and apparatus for manufacturing nitrogen tetroxide24 Dec 2024US 12,172,890 B1VERO Biotech Inc.
- High energy recovery nitric acid process using liquid oxygen containing fluid20 Feb 2024US 11,905,172 B2Yara International Asa
- Generation of nitrogen dioxide for use with burner-based exhaust replication system7 Feb 2023US 11,573,155 B2Southwest Research Institute
- Apparatus and method26 Feb 2026US 2026/0054245 A1The University of Liverpool
- Static mixer12 Feb 2026US 2026/0042070 A1Global Analyzer Systems Limited
- Ammonium nitrate production18 Dec 2025US 2025/0381545 A1Katholieke Universiteit Leuven
- Comproportionation-based autocatalytic cycles and related methods18 Dec 2025US 2025/0382173 A1Wisconsin Alumni Research Foundation
- Method and apparatus for manufacturing nitrogen tetroxide2 Oct 2025US 2025/0304444 A1VERO Biotech Inc.
Most cited
By later US patents
- Powders providing controlled sustained release of a gas64US 5,965,264 ABernard Technologies, Inc. · 1999
- Process for removing nitrogen oxides from gas39US 3,957,949 AFuji Kasui Engineering Co., Ltd. · 1976
- NOx removal process26US 5,650,127 AGoal Line Environmental Technologies LLC · 1997
- Process for utilizing collected material removed from effluent gas19US 3,981,815 AEbara Manufacturing Co., Ltd. · 1976
- Thermal decomposition of metal nitrates16US 4,141,963 ACiba-Geigy Corporation · 1979