B01D 53/56
Nitrogen oxides
Official title: Nitrogen oxides (B01D53/60 takes precedence)
B01D53/56 (Nitrogen oxides) appears on 984 US grants and 826 published applications in this corpus.
Search patents in B01D- Granted patents
- 984
- Published applications
- 826
- Assignees
- 632
- Inventors
- 2,361
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 12 | 0 |
| 1977 | 9 | 0 |
| 1978 | 17 | 0 |
| 1979 | 9 | 0 |
| 1980 | 14 | 0 |
| 1981 | 5 | 0 |
| 1982 | 13 | 0 |
| 1983 | 8 | 0 |
| 1984 | 7 | 0 |
| 1985 | 4 | 0 |
| 1986 | 7 | 0 |
| 1987 | 9 | 0 |
| 1988 | 15 | 0 |
| 1989 | 23 | 0 |
| 1990 | 20 | 0 |
| 1991 | 17 | 0 |
| 1992 | 21 | 0 |
| 1993 | 23 | 0 |
| 1994 | 14 | 0 |
| 1995 | 21 | 0 |
| 1996 | 23 | 0 |
| 1997 | 21 | 0 |
| 1998 | 19 | 0 |
| 1999 | 18 | 0 |
| 2000 | 22 | 0 |
| 2001 | 22 | 6 |
| 2002 | 23 | 13 |
| 2003 | 21 | 25 |
| 2004 | 12 | 37 |
| 2005 | 13 | 24 |
| 2006 | 12 | 17 |
| 2007 | 14 | 12 |
| 2008 | 16 | 28 |
| 2009 | 13 | 14 |
| 2010 | 18 | 21 |
| 2011 | 18 | 26 |
| 2012 | 14 | 36 |
| 2013 | 29 | 51 |
| 2014 | 46 | 55 |
| 2015 | 36 | 62 |
| 2016 | 27 | 39 |
| 2017 | 27 | 35 |
| 2018 | 31 | 53 |
| 2019 | 44 | 37 |
| 2020 | 42 | 44 |
| 2021 | 33 | 35 |
| 2022 | 32 | 36 |
| 2023 | 21 | 31 |
| 2024 | 20 | 35 |
| 2025 | 16 | 34 |
| 2026 | 13 | 20 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Flue gas purification system for hazardous waste incineration and purification method25 Aug 2026US 12,714,969 B2Chongqing Greening Environmental Protection Co. Ltd
- Furnace operation method11 Aug 2026US 12,703,652 B2American Air Liquide, Inc.
- Absorption column comprising a feed box having a serrated weir and a structured packing and process for the production of nitric acid28 Jul 2026US 12,692,156 B2Yara International Asa
- Dual pressure plant for the production of nitric acid and method for operating same30 Jun 2026US 12,668,489 B2Yara International Asa
- Method of elimination of poly- and perfluoroalkyl substances (PFAS) in a wastewater biosolids gasification process using a thermal oxidizer and hydrated lime injection9 Jun 2026US 12,649,885 B2Aries Clean Technologies LLC
- Removal of atmospheric pollutants from gas, related apparatus, processes and uses thereof24 Sep 2026US 2026/0284589 A1Intelligent Abatement, LLC
- Tractor24 Sep 2026US 2026/0286874 A1Kubota Corporation
- Combination carbon monoxide and nitrogen dioxide scrubber treatment and process17 Sep 2026US 2026/0273461 A1
- Reduction of nox emissions from semiconductor process tools17 Sep 2026US 2026/0273463 A1Taiwan Semiconductor Manufacturing Company.Ltd
- Exhaust gas treatment apparatus10 Sep 2026US 2026/0263994 A1Nanomist Technologies Co., Ltd.
Most cited
By later US patents
- Process for removal or mercury vapor and/or vapor of noxious organic compounds and/or nitrogen oxides from flue gas from an incinerator plant206US 4,889,698 AA/S Niro Atomizer · 1989
- Generation of nitric oxide from air for medical uses171US 5,396,882 AThe General Hospital Corporation · 1995
- Methods for removing air pollutants from combustion flue gas143US 5,670,122 AEnergy and Environmental Research Corporation · 1997
- Method for the removal of mercury and nitrogen oxides from combustion flue gas121US 6,375,909 B1Infilco Degremont Inc. · 2002
- Urea reduction of NO.sub.x in combustion effluents113US 4,208,386 AElectric Power Research Institute, Inc. · 1980