B01D 2255/902
Multilayered catalyst
B01D2255/902 (Multilayered catalyst) appears on 746 US grants and 1,001 published applications in this corpus.
Search patents in B01D- Granted patents
- 746
- Published applications
- 1,001
- Assignees
- 184
- Inventors
- 1,412
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 3 | 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 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 3 | 0 |
| 1993 | 6 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 3 | 0 |
| 1998 | 3 | 0 |
| 1999 | 4 | 0 |
| 2000 | 3 | 0 |
| 2001 | 2 | 4 |
| 2002 | 6 | 4 |
| 2003 | 2 | 10 |
| 2004 | 6 | 6 |
| 2005 | 5 | 9 |
| 2006 | 3 | 5 |
| 2007 | 1 | 11 |
| 2008 | 1 | 30 |
| 2009 | 12 | 37 |
| 2010 | 25 | 46 |
| 2011 | 16 | 39 |
| 2012 | 34 | 32 |
| 2013 | 34 | 34 |
| 2014 | 43 | 62 |
| 2015 | 36 | 72 |
| 2016 | 50 | 57 |
| 2017 | 47 | 60 |
| 2018 | 53 | 82 |
| 2019 | 52 | 63 |
| 2020 | 57 | 58 |
| 2021 | 47 | 51 |
| 2022 | 49 | 66 |
| 2023 | 46 | 60 |
| 2024 | 28 | 44 |
| 2025 | 37 | 32 |
| 2026 | 20 | 27 |
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
- Multi-layer TWC formulations with optimalized PGM loadings29 Sep 2026US 12,746,510 B2Johnson Matthey Public Limited Company
- 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
- 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 catalyst device3 Sep 2026US 2026/0257210 A1Cataler Corporation
- Exhaust Gas Purification Catalyst20 Aug 2026US 2026/0243188 A1Cataler Corporation
Most cited
By later US patents
- Layered catalyst composite162US 5,597,771 AEngelhard Corporation · 1997
- Catalyst composition containing segregated platinum and rhodium components151US 5,057,483 AEngelhard Corporation · 1991
- 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