B01D 2255/207
Transition metals
B01D2255/207 (Transition metals) appears on 3,205 US grants and 4,211 published applications in this corpus.
Search patents in B01D- Granted patents
- 3,205
- Published applications
- 4,211
- Assignees
- 1,389
- Inventors
- 7,373
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 12 | 0 |
| 1977 | 16 | 0 |
| 1978 | 15 | 0 |
| 1979 | 5 | 0 |
| 1980 | 8 | 0 |
| 1981 | 3 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 3 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 6 | 0 |
| 1991 | 7 | 0 |
| 1992 | 15 | 0 |
| 1993 | 9 | 0 |
| 1994 | 12 | 0 |
| 1995 | 17 | 0 |
| 1996 | 16 | 0 |
| 1997 | 20 | 0 |
| 1998 | 33 | 0 |
| 1999 | 37 | 0 |
| 2000 | 43 | 0 |
| 2001 | 30 | 15 |
| 2002 | 32 | 23 |
| 2003 | 27 | 39 |
| 2004 | 29 | 36 |
| 2005 | 22 | 46 |
| 2006 | 23 | 53 |
| 2007 | 17 | 82 |
| 2008 | 31 | 98 |
| 2009 | 42 | 189 |
| 2010 | 104 | 227 |
| 2011 | 96 | 216 |
| 2012 | 120 | 199 |
| 2013 | 167 | 207 |
| 2014 | 169 | 256 |
| 2015 | 196 | 264 |
| 2016 | 181 | 245 |
| 2017 | 199 | 237 |
| 2018 | 189 | 262 |
| 2019 | 214 | 236 |
| 2020 | 178 | 219 |
| 2021 | 166 | 225 |
| 2022 | 178 | 216 |
| 2023 | 178 | 210 |
| 2024 | 130 | 173 |
| 2025 | 127 | 140 |
| 2026 | 76 | 98 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- B01D 2255/20761CopperIndexing code1,181
- B01D 2255/20738IronIndexing code1,081
- B01D 2255/20707TitaniumIndexing code961
- B01D 2255/20715ZirconiumIndexing code709
- B01D 2255/2073ManganeseIndexing code664
- B01D 2255/20723VanadiumIndexing code578
- B01D 2255/20776TungstenIndexing code478
- B01D 2255/20746CobaltIndexing code472
Recent patents
- Complex oxides for reactive oxygen separation and related applications6 Oct 2026US 12,752,260 B2North Carolina State University
- Filter for air purification and manufacturing method thereof15 Sep 2026US 12,734,512 B2Hyundai Motor Company
- 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
- Selective catalytic reduction catalyst for the treatment of an exhaust gas8 Sep 2026US 12,728,409 B2BASF Mobile Emissions Catalysts LLC
- Ozone catalytic elimination device and plasma beauty instrument1 Sep 2026US 12,722,021 B2Shenzhen Leaflife Technology Co., Ltd.
- Catalytic article comprising vanadium-containing catalyst and oxidation catalyst8 Oct 2026US 2026/0307065 A1
- Improved electrodes for electrochemically driven carbon dioxide separator1 Oct 2026US 2026/0295518 A1Repair DAC Ltd.
- 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
- Reduction of nox emissions from semiconductor process tools17 Sep 2026US 2026/0273463 A1Taiwan Semiconductor Manufacturing Company.Ltd
Most cited
By later US patents
- Method for reduction of nitrogen oxides with ammonia using promoted zeolite catalysts223US 4,961,917 AEngelhard Corporation · 1990
- System and method for sequestration and separation of mercury in combustion exhaust gas aqueous scrubber systems182US 7,722,843 B12010
- Staged metal-promoted zeolite catalysts and method for catalytic reduction of nitrogen oxides using the same156US 5,516,497 AEngelhard Corporation · 1996
- NOx decreasing apparatus for an internal combustion engine153US 5,412,946 AKabushiki Kaisha Toyota Chuo Kenkyusho · 1995
- Exhaust gas purification apparatus for an internal combustion engine149US 5,402,641 AToyota Jidosha Kabushiki Kaisha · 1995