C01B 21/262
Obtaining nitrogen dioxide or tetroxide
Official title: {obtaining nitrogen dioxide or tetroxide}
C01B21/262 (Obtaining nitrogen dioxide or tetroxide) appears on 10 US grants and 9 published applications in this corpus.
Search patents in C01B- Granted patents
- 10
- Published applications
- 9
- Assignees
- 21
- Inventors
- 41
- Latest grant
- 3 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 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 | 1 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 1 |
| 2014 | 1 | 0 |
| 2015 | 0 | 1 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 2 |
| 2019 | 1 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 1 |
| 2022 | 0 | 1 |
| 2023 | 0 | 0 |
| 2024 | 0 | 2 |
| 2025 | 0 | 0 |
| 2026 | 1 | 0 |
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
- Process and plant for preparing nitric acid7 May 2019US 10,280,085 B2thyssenkrupp AG
- Process for preparing nitric acid with a concentration in the range from 50 to 77.8% by weight1 Jul 2014US 8,765,009 B2BASF SE
- Method and production of nitric acid26 Dec 2000US 6,165,435 APraxair Technology, Inc.
- Nitric acid production16 Nov 1999US 5,985,230 AL'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
- Catalytic structures with metal oxide substrates, and methods for fabrication and use thereof28 Nov 2024US 2024/0390880 A1Hight-Tech, Inc.
- High energy recovery process for the production of nitric acid4 Jul 2024US 2024/0217820 A1Atlas Agro Holding AG
- Apparatus and process for conversion of ammonia into oxides of nitrogen5 May 2022US 2022/0135407 A1Deepak Nitrite Limited
- Process for nitric acid production5 Aug 2021US 2021/0238038 A1Casale SA
- Reduction of the nox waste gas concentration in the production of nitric acid during a shutdown and/or start-up process of the production device13 Dec 2018US 2018/0354794 A1thyssenkrupp AG
Most cited
By later US patents
- Process for converting nitrogen dioxide into nitrogen monoxide13US 4,073,866 AAgency of Industrial Science and Technology of Japan · 1978
- Method and apparatus for converting nitrogen dioxide to nitric oxide12US 3,979,501 AMeloy Laboratories, Inc. · 1976
- Nitric acid production11US 5,985,230 AL'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude · 1999
- Process for the recirculation of nitrogen oxides7US 4,367,204 ABudapesti Muszaki Egyetem · 1983
- Method and production of nitric acid5US 6,165,435 APraxair Technology, Inc. · 2000