B01D 2257/40
Nitrogen compounds
B01D2257/40 (Nitrogen compounds) appears on 2,499 US grants and 3,422 published applications in this corpus.
Search patents in B01D- Granted patents
- 2,499
- Published applications
- 3,422
- Assignees
- 1,480
- Inventors
- 7,389
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 3 | 0 |
| 1978 | 5 | 0 |
| 1979 | 3 | 0 |
| 1980 | 2 | 0 |
| 1981 | 5 | 0 |
| 1982 | 2 | 0 |
| 1983 | 5 | 0 |
| 1984 | 0 | 0 |
| 1985 | 2 | 0 |
| 1986 | 5 | 0 |
| 1987 | 6 | 0 |
| 1988 | 6 | 0 |
| 1989 | 1 | 0 |
| 1990 | 10 | 0 |
| 1991 | 4 | 0 |
| 1992 | 8 | 0 |
| 1993 | 4 | 0 |
| 1994 | 11 | 0 |
| 1995 | 11 | 0 |
| 1996 | 11 | 0 |
| 1997 | 23 | 0 |
| 1998 | 21 | 0 |
| 1999 | 13 | 0 |
| 2000 | 30 | 0 |
| 2001 | 20 | 10 |
| 2002 | 35 | 33 |
| 2003 | 34 | 44 |
| 2004 | 25 | 46 |
| 2005 | 25 | 53 |
| 2006 | 33 | 41 |
| 2007 | 25 | 53 |
| 2008 | 34 | 73 |
| 2009 | 39 | 104 |
| 2010 | 55 | 184 |
| 2011 | 68 | 152 |
| 2012 | 114 | 150 |
| 2013 | 132 | 155 |
| 2014 | 122 | 109 |
| 2015 | 124 | 180 |
| 2016 | 109 | 186 |
| 2017 | 143 | 163 |
| 2018 | 134 | 195 |
| 2019 | 176 | 175 |
| 2020 | 159 | 177 |
| 2021 | 133 | 159 |
| 2022 | 130 | 160 |
| 2023 | 120 | 196 |
| 2024 | 106 | 238 |
| 2025 | 121 | 212 |
| 2026 | 90 | 174 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Exhaust gas purification catalyst6 Oct 2026US 12,752,237 B2Cataler Corporation
- Air conditioning and filtration system29 Sep 2026US 12,746,502 B2Work Air Technologies Pty Ltd
- Method for manufacturing exhaust gas purification catalyst29 Sep 2026US 12,746,538 B2Cataler Corporation
- Photocatalyst filter and electronic device comprising same15 Sep 2026US 12,734,266 B2Samsung Electronics Co., Ltd.
- Nitrogen oxides warm up control15 Sep 2026US 12,734,480 B1GM Global Technology Operations LLC
- Method and device for separating a carbon dioxide-containing gas by partial condensation and/or distillation and/or solidification8 Oct 2026US 2026/0306989 A1L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Exhaust purification device8 Oct 2026US 2026/0307009 A1Mazda Motor Corporation
- Modified Metal-Organic Framework (MOF) Compositions, Process of Making and Process of Use Thereof8 Oct 2026US 2026/0307047 A1NuMat Technologies, Inc.
- System for treating an exhaust gas8 Oct 2026US 2026/0307052 A1Johnson Matthey Public Limited Company
- Method for producing fe-doped beta zeolite catalyst monoliths8 Oct 2026US 2026/0307064 A1BASF SE
Most cited
By later US patents
- Respirator filter system167US 5,714,126 AMine Safety Appliances Company · 1998
- Process for purifying a gas by adsorption of the impurities on several active carbons147US 6,402,813 B2L 'Air Liquide-Societe 'Anonyme a 'Directoire et Conseil de Surveillance pour l 'Etude et L'Exploitation des Procedes Georges Claude · 2002
- Methods and apparatus to generate liquid ambulatory oxygen from an oxygen concentrator136US 5,979,440 ASeQual Technologies, Inc. · 1999
- Filter and method for removing mercury, bacteria, pathogens and other vapors from gas134US 4,917,862 A1990
- Low pressure injection and turbulent mixing in selective catalytic reduction system134US 6,449,947 B1Fleetguard, Inc. · 2002