B01D 2255/20
Metals or compounds thereof
B01D2255/20 (Metals or compounds thereof) appears on 3,963 US grants and 5,237 published applications in this corpus.
Search patents in B01D- Granted patents
- 3,963
- Published applications
- 5,237
- Assignees
- 1,522
- Inventors
- 8,346
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 16 | 0 |
| 1977 | 16 | 0 |
| 1978 | 15 | 0 |
| 1979 | 5 | 0 |
| 1980 | 8 | 0 |
| 1981 | 3 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 5 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 4 | 0 |
| 1990 | 8 | 0 |
| 1991 | 9 | 0 |
| 1992 | 15 | 0 |
| 1993 | 10 | 0 |
| 1994 | 12 | 0 |
| 1995 | 19 | 0 |
| 1996 | 20 | 0 |
| 1997 | 21 | 0 |
| 1998 | 41 | 0 |
| 1999 | 43 | 0 |
| 2000 | 57 | 0 |
| 2001 | 34 | 19 |
| 2002 | 40 | 40 |
| 2003 | 38 | 59 |
| 2004 | 39 | 55 |
| 2005 | 32 | 70 |
| 2006 | 30 | 88 |
| 2007 | 29 | 117 |
| 2008 | 45 | 124 |
| 2009 | 59 | 270 |
| 2010 | 136 | 301 |
| 2011 | 127 | 266 |
| 2012 | 162 | 242 |
| 2013 | 218 | 239 |
| 2014 | 211 | 293 |
| 2015 | 228 | 317 |
| 2016 | 223 | 284 |
| 2017 | 243 | 288 |
| 2018 | 228 | 315 |
| 2019 | 257 | 284 |
| 2020 | 214 | 269 |
| 2021 | 204 | 266 |
| 2022 | 213 | 278 |
| 2023 | 215 | 256 |
| 2024 | 152 | 219 |
| 2025 | 159 | 162 |
| 2026 | 94 | 116 |
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
- Complex oxides for reactive oxygen separation and related applications6 Oct 2026US 12,752,260 B2North Carolina State University
- Multi-layer TWC formulations with optimalized PGM loadings29 Sep 2026US 12,746,510 B2Johnson Matthey Public Limited Company
- Layered tri-metallic catalytic article and method of manufacturing the catalytic article29 Sep 2026US 12,746,532 B2BASF Mobile Emissions Catalysts LLC
- Exhaust gas purification device and method for manufacturing exhaust gas purification device29 Sep 2026US 12,746,533 B2Cataler Corporation
- 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.
- Complete oxidation catalysts for dilute alkanes1 Oct 2026US 2026/0295521 A1Icarus Technology LLC
- Improved hydrocarbon trap for cold-start hydrocarbon control from internal combustion engines1 Oct 2026US 2026/0295527 A1
- Catalytic materials comprising fe-containing zeolitic material for the treatment of an exhaust gas1 Oct 2026US 2026/0295569 A1
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