B01D 53/9409
Nitrogen oxides
Official title: {Nitrogen oxides}
B01D53/9409 (Nitrogen oxides) appears on 3,338 US grants and 3,684 published applications in this corpus.
Search patents in B01D- Granted patents
- 3,338
- Published applications
- 3,684
- Assignees
- 819
- Inventors
- 5,842
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 18 | 0 |
| 1977 | 20 | 0 |
| 1978 | 17 | 0 |
| 1979 | 7 | 0 |
| 1980 | 8 | 0 |
| 1981 | 4 | 0 |
| 1982 | 0 | 0 |
| 1983 | 3 | 0 |
| 1984 | 4 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 2 | 0 |
| 1989 | 4 | 0 |
| 1990 | 7 | 0 |
| 1991 | 5 | 0 |
| 1992 | 18 | 0 |
| 1993 | 15 | 0 |
| 1994 | 25 | 0 |
| 1995 | 26 | 0 |
| 1996 | 20 | 0 |
| 1997 | 25 | 0 |
| 1998 | 56 | 0 |
| 1999 | 54 | 0 |
| 2000 | 61 | 0 |
| 2001 | 55 | 33 |
| 2002 | 71 | 71 |
| 2003 | 74 | 97 |
| 2004 | 66 | 105 |
| 2005 | 63 | 76 |
| 2006 | 62 | 90 |
| 2007 | 48 | 109 |
| 2008 | 37 | 104 |
| 2009 | 55 | 171 |
| 2010 | 95 | 197 |
| 2011 | 84 | 145 |
| 2012 | 127 | 137 |
| 2013 | 148 | 147 |
| 2014 | 135 | 171 |
| 2015 | 164 | 217 |
| 2016 | 150 | 192 |
| 2017 | 181 | 246 |
| 2018 | 176 | 281 |
| 2019 | 252 | 232 |
| 2020 | 205 | 205 |
| 2021 | 190 | 162 |
| 2022 | 153 | 149 |
| 2023 | 130 | 120 |
| 2024 | 104 | 107 |
| 2025 | 82 | 69 |
| 2026 | 29 | 51 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Selective catalytic reduction catalyst for the treatment of an exhaust gas8 Sep 2026US 12,728,409 B2BASF Mobile Emissions Catalysts LLC
- Exhaust gas rectifier and exhaust gas purification system1 Sep 2026US 12,723,530 B2Yanmar Holdings Co., Ltd.
- Catalyzed soot filter with reduced ammonia oxidation1 Sep 2026US 12,723,531 B2BASF Mobile Emissions Catalysts LLC
- Vapor displacement refueling including data communications, zero gravity and chemical looping combustion system25 Aug 2026US 12,718,682 B2
- Decomposition chamber with guide swirl mixer11 Aug 2026US 12,704,086 B2Cummins Emission Solutions Inc.
- Method for producing fe-doped beta zeolite catalyst monoliths8 Oct 2026US 2026/0307064 A1BASF SE
- Structural body and design method therefor, and liquid droplet atomization system including structural body1 Oct 2026US 2026/0295526 A1Tokai University Educational System
- Catalytic materials comprising fe-containing zeolitic material for the treatment of an exhaust gas1 Oct 2026US 2026/0295569 A1
- Composite of manganese-based oxide and zeolite useful as nh3-scr catalyst24 Sep 2026US 2026/0284594 A1
- Modified copper zeolites and method of using the same for treatment of gas streams containing nox24 Sep 2026US 2026/0284646 A1BASF SE
Most cited
By later US patents
- Method for reduction of nitrogen oxides with ammonia using promoted zeolite catalysts223US 4,961,917 AEngelhard Corporation · 1990
- Method and apparatus for reducing nitrogen oxides from internal combustion engine207US 5,272,871 AKabushiki Kaisha Toyota Chuo Kenkyusho · 1993
- Exhaust purification device of internal combustion engine199US 5,473,887 AToyota Jidosha Kabushiki Kaisha · 1995
- Reducing no.sub.x emissions from an engine by temperature-controlled urea injection for selective catalytic reduction171US 6,063,350 AClean Diesel Technologies, Inc. · 2000
- Low emission, diesel-cycle engine158US 6,470,682 B2The United States of America as represented by the Administrator of the United States Environmental Protection Agency · 2002