B01D 2251/206
Ammonium compounds
B01D2251/206 (Ammonium compounds) appears on 1,627 US grants and 2,055 published applications in this corpus.
Search patents in B01D- Granted patents
- 1,627
- Published applications
- 2,055
- Assignees
- 707
- Inventors
- 3,783
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 5 | 0 |
| 1978 | 3 | 0 |
| 1979 | 3 | 0 |
| 1980 | 8 | 0 |
| 1981 | 3 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 3 | 0 |
| 1985 | 1 | 0 |
| 1986 | 3 | 0 |
| 1987 | 2 | 0 |
| 1988 | 3 | 0 |
| 1989 | 2 | 0 |
| 1990 | 3 | 0 |
| 1991 | 4 | 0 |
| 1992 | 7 | 0 |
| 1993 | 1 | 0 |
| 1994 | 8 | 0 |
| 1995 | 5 | 0 |
| 1996 | 10 | 0 |
| 1997 | 6 | 0 |
| 1998 | 7 | 0 |
| 1999 | 6 | 0 |
| 2000 | 9 | 0 |
| 2001 | 11 | 5 |
| 2002 | 8 | 6 |
| 2003 | 5 | 9 |
| 2004 | 9 | 12 |
| 2005 | 6 | 27 |
| 2006 | 16 | 23 |
| 2007 | 13 | 65 |
| 2008 | 18 | 77 |
| 2009 | 27 | 114 |
| 2010 | 58 | 163 |
| 2011 | 66 | 155 |
| 2012 | 113 | 114 |
| 2013 | 131 | 96 |
| 2014 | 102 | 103 |
| 2015 | 98 | 129 |
| 2016 | 98 | 139 |
| 2017 | 95 | 116 |
| 2018 | 88 | 113 |
| 2019 | 129 | 107 |
| 2020 | 92 | 95 |
| 2021 | 96 | 69 |
| 2022 | 61 | 83 |
| 2023 | 52 | 71 |
| 2024 | 52 | 69 |
| 2025 | 54 | 54 |
| 2026 | 25 | 41 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Nitrogen oxide removing denitrification catalyst having high durability against sulfur dioxide, method for preparing the same, and method for removing nitrogen oxide using the same8 Sep 2026US 12,728,406 B2Korea Institute of Science and Technology
- Exhaust gas rectifier and exhaust gas purification system1 Sep 2026US 12,723,530 B2Yanmar Holdings Co., Ltd.
- Flue gas purification system for hazardous waste incineration and purification method25 Aug 2026US 12,714,969 B2Chongqing Greening Environmental Protection Co. Ltd
- Multi-stage ammonia-based decarbonization11 Aug 2026US 12,703,638 B2Jiangnan Environmental Protection Group Inc.
- Furnace operation method11 Aug 2026US 12,703,652 B2American Air Liquide, Inc.
- Method for producing fe-doped beta zeolite catalyst monoliths8 Oct 2026US 2026/0307064 A1BASF SE
- Control systems and methods for exhaust pollution mitigation1 Oct 2026US 2026/0295519 A1ECC TEC MSJ Incorporated
- Structural body and design method therefor, and liquid droplet atomization system including structural body1 Oct 2026US 2026/0295526 A1Tokai University Educational System
- Composite of manganese-based oxide and zeolite useful as nh3-scr catalyst24 Sep 2026US 2026/0284594 A1
- Exhaust aftertreatment system24 Sep 2026US 2026/0286878 A1Donaldson Company, Inc.
Most cited
By later US patents
- Apparatus for manufacturing a process abatement reactor386US 7,736,600 B2APPLIED Materials.Inc. · 2010
- Method for reduction of nitrogen oxides with ammonia using promoted zeolite catalysts223US 4,961,917 AEngelhard Corporation · 1990
- 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
- Staged metal-promoted zeolite catalysts and method for catalytic reduction of nitrogen oxides using the same156US 5,516,497 AEngelhard Corporation · 1996
- Method and apparatus for emission control148US 6,314,722 B1Matros Technologies, Inc. · 2001