B01D 2255/204
Alkaline earth metals
B01D2255/204 (Alkaline earth metals) appears on 799 US grants and 1,014 published applications in this corpus.
Search patents in B01D- Granted patents
- 799
- Published applications
- 1,014
- Assignees
- 334
- Inventors
- 1,988
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 4 | 0 |
| 1978 | 5 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 3 | 0 |
| 1994 | 1 | 0 |
| 1995 | 4 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 12 | 0 |
| 1999 | 13 | 0 |
| 2000 | 23 | 0 |
| 2001 | 10 | 12 |
| 2002 | 20 | 27 |
| 2003 | 21 | 22 |
| 2004 | 14 | 16 |
| 2005 | 13 | 17 |
| 2006 | 14 | 26 |
| 2007 | 5 | 20 |
| 2008 | 7 | 25 |
| 2009 | 11 | 55 |
| 2010 | 21 | 62 |
| 2011 | 25 | 56 |
| 2012 | 37 | 36 |
| 2013 | 45 | 44 |
| 2014 | 38 | 49 |
| 2015 | 40 | 57 |
| 2016 | 37 | 50 |
| 2017 | 47 | 59 |
| 2018 | 38 | 56 |
| 2019 | 61 | 53 |
| 2020 | 37 | 52 |
| 2021 | 30 | 32 |
| 2022 | 33 | 53 |
| 2023 | 26 | 48 |
| 2024 | 33 | 43 |
| 2025 | 32 | 32 |
| 2026 | 22 | 12 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- 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
- Composite, zoned oxidation catalyst for a compression ignition internal combustion engine25 Aug 2026US 12,714,990 B2Johnson Matthey Public Limited Company
- 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 method and exhaust gas purification apparatus20 Aug 2026US 2026/0241339 A1Mitsubishi Heavy Industries, Ltd.
- Exhaust gas purification catalyst30 Jul 2026US 2026/0216702 A1Mitsui Mining & Smelting Co., Ltd.
- Improved three-way catalysts23 Jul 2026US 2026/0208106 A1
- Exhaust Gas Purification Catalyst23 Jul 2026US 2026/0208107 A1Cataler Corporation
Most cited
By later US patents
- Exhaust gas purification apparatus for an internal combustion engine149US 5,402,641 AToyota Jidosha Kabushiki Kaisha · 1995
- Exhaust gas purification device for an engine103US 5,472,673 AToyota Jidosha Kabushiki Kaisha · 1995
- Catalytic wall-flow filter103US 6,753,294 B1Johnson Matthey Public Limited Company · 2004
- Multi-zoned catalytic trap and methods of making and using the same88US 6,375,910 B1Engelhard Corporation · 2002
- Engine exhaust gas purification catalyst and exhaust gas purifier84US 6,047,544 ANissan Motor Co., Ltd. · 2000