B01D 2257/402
Dinitrogen oxide
B01D2257/402 (Dinitrogen oxide) appears on 241 US grants and 331 published applications in this corpus.
Search patents in B01D- Granted patents
- 241
- Published applications
- 331
- Assignees
- 179
- Inventors
- 835
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 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 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 3 | 0 |
| 2001 | 2 | 1 |
| 2002 | 8 | 5 |
| 2003 | 6 | 13 |
| 2004 | 5 | 9 |
| 2005 | 5 | 10 |
| 2006 | 5 | 7 |
| 2007 | 7 | 8 |
| 2008 | 4 | 14 |
| 2009 | 7 | 8 |
| 2010 | 8 | 18 |
| 2011 | 4 | 25 |
| 2012 | 9 | 13 |
| 2013 | 14 | 12 |
| 2014 | 12 | 8 |
| 2015 | 7 | 12 |
| 2016 | 12 | 9 |
| 2017 | 13 | 14 |
| 2018 | 7 | 19 |
| 2019 | 9 | 11 |
| 2020 | 18 | 13 |
| 2021 | 17 | 18 |
| 2022 | 15 | 15 |
| 2023 | 10 | 10 |
| 2024 | 10 | 15 |
| 2025 | 7 | 24 |
| 2026 | 11 | 20 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Process for working-up a nitrous oxide comprising off-gas stream11 Aug 2026US 12,702,951 B2BASF SE
- Process for decomposing nitrous oxide from a gas stream28 Jul 2026US 12,691,413 B2BASF SE
- System and method for lowering nitrogen oxides content from tail gas30 Jun 2026US 12,667,808 B2
- Waste gas treatment apparatus for semiconductor and display processes14 Apr 2026US 12,604,697 B2
- Solid filtration medium incorporating polyacrylamide powder and carbon7 Apr 2026US 12,594,522 B2Purafil, Inc.
- System for treating exhaust gas from nitrogen-containing-fuel- or hydrogen-combustor6 Aug 2026US 2026/0225040 A1Johnson Matthey Public Limited Company
- Process for removing nitric oxide, nitrous oxide and carbon monoxide from a gas stream30 Jul 2026US 2026/0216642 A1BASF SE
- Reducing the content of nox and n2o in the offgas from firing plants operated with nh3 for catalytic decomposition of nh330 Jul 2026US 2026/0216648 A1
- Reduction of nox and n2o in the exhaust gas of ship motors operated using nh330 Jul 2026US 2026/0216649 A1
- High efficiency electro-photocatalysts16 Jul 2026US 2026/0199827 A1
Most cited
By later US patents
- Method for the removal of mercury and nitrogen oxides from combustion flue gas121US 6,375,909 B1Infilco Degremont Inc. · 2002
- Corona discharge reactor and method of chemically activating constituents thereby74US 5,733,360 AEnvironmental Elements Corp. · 1998
- Method and apparatus for gas purification72US 7,527,670 B2Praxair Technology, Inc. · 2009
- Nitrous oxide based oxygen supply system67US 6,347,627 B1Pioneer Inventions, Inc. · 2002
- Oxygen generator with two compressor stages58US 4,552,571 AVBM Corporation · 1985