B01D 2255/9022
Two layers
B01D2255/9022 (Two layers) appears on 587 US grants and 811 published applications in this corpus.
Search patents in B01D- Granted patents
- 587
- Published applications
- 811
- Assignees
- 125
- Inventors
- 1,141
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 3 |
| 2002 | 4 | 2 |
| 2003 | 2 | 4 |
| 2004 | 3 | 2 |
| 2005 | 4 | 6 |
| 2006 | 1 | 4 |
| 2007 | 0 | 7 |
| 2008 | 0 | 15 |
| 2009 | 4 | 28 |
| 2010 | 19 | 38 |
| 2011 | 13 | 32 |
| 2012 | 30 | 24 |
| 2013 | 27 | 30 |
| 2014 | 33 | 48 |
| 2015 | 29 | 57 |
| 2016 | 40 | 44 |
| 2017 | 36 | 51 |
| 2018 | 44 | 71 |
| 2019 | 45 | 57 |
| 2020 | 47 | 51 |
| 2021 | 41 | 43 |
| 2022 | 43 | 59 |
| 2023 | 40 | 48 |
| 2024 | 24 | 40 |
| 2025 | 32 | 27 |
| 2026 | 15 | 20 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Exhaust gas purification catalyst6 Oct 2026US 12,752,237 B2Cataler Corporation
- Composite, zoned oxidation catalyst for a compression ignition internal combustion engine25 Aug 2026US 12,714,990 B2Johnson Matthey Public Limited Company
- Automotive 3-way catalyst system containing a tail pipe catalyst4 Aug 2026US 12,697,604 B2BASF Mobile Emissions Catalysts LLC
- Low-temperature hydrogen oxidation system30 Jun 2026US 12,667,807 B2Toplus Energy Corporation
- Performance enhancement of a platinum-containing catalyst via exhaust gas hydrogen enrichment16 Jun 2026US 12,654,160 B2BASF Mobile Emissions Catalysts LLC
- Catalytic article comprising vanadium-containing catalyst and oxidation catalyst8 Oct 2026US 2026/0307065 A1
- Improved hydrocarbon trap for cold-start hydrocarbon control from internal combustion engines1 Oct 2026US 2026/0295527 A1
- Exhaust gas purification catalyst composition, exhaust gas purification catalyst and exhaust gas purification system3 Sep 2026US 2026/0257173 A1Mitsui Mining & Smelting Co., Ltd.
- Exhaust Gas Purification Catalyst20 Aug 2026US 2026/0243188 A1Cataler Corporation
- Exhaust gas purification catalyst13 Aug 2026US 2026/0233161 A1Mitsui Mining & Smelting Co., Ltd.
Most cited
By later US patents
- Exhaust gas treatment system120US 6,087,298 AEngelhard Corporation · 2000
- Catalysts for the reduction of ammonia emission from rich-burn exhaust92US 8,101,146 B2Johnson Matthey Public Limited Company · 2012
- Multi-zoned catalytic trap and methods of making and using the same88US 6,375,910 B1Engelhard Corporation · 2002
- Diesel oxidation catalyst composite with layer structure for carbon monoxide and hydrocarbon conversion79US 8,211,392 B2BASF SE · 2012
- SOx tolerant NOx trap catalysts and methods of making and using the same67US 6,777,370 B2Engelhard Corporation · 2004