F01N 2250/00
Combinations of different methods of purification
F01N2250/00 (Combinations of different methods of purification) appears on 1,027 US grants and 818 published applications in this corpus.
Search patents in F01N- Granted patents
- 1,027
- Published applications
- 818
- Assignees
- 326
- Inventors
- 2,204
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 10 | 0 |
| 1977 | 7 | 0 |
| 1978 | 3 | 0 |
| 1979 | 2 | 0 |
| 1980 | 3 | 0 |
| 1981 | 3 | 0 |
| 1982 | 12 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 8 | 0 |
| 1986 | 6 | 0 |
| 1987 | 6 | 0 |
| 1988 | 5 | 0 |
| 1989 | 4 | 0 |
| 1990 | 13 | 0 |
| 1991 | 12 | 0 |
| 1992 | 19 | 0 |
| 1993 | 17 | 0 |
| 1994 | 13 | 0 |
| 1995 | 34 | 0 |
| 1996 | 30 | 0 |
| 1997 | 37 | 0 |
| 1998 | 48 | 0 |
| 1999 | 36 | 0 |
| 2000 | 25 | 0 |
| 2001 | 24 | 7 |
| 2002 | 17 | 27 |
| 2003 | 15 | 23 |
| 2004 | 34 | 48 |
| 2005 | 20 | 59 |
| 2006 | 27 | 32 |
| 2007 | 25 | 35 |
| 2008 | 25 | 38 |
| 2009 | 28 | 46 |
| 2010 | 24 | 38 |
| 2011 | 15 | 27 |
| 2012 | 26 | 23 |
| 2013 | 23 | 15 |
| 2014 | 28 | 20 |
| 2015 | 13 | 31 |
| 2016 | 33 | 33 |
| 2017 | 27 | 31 |
| 2018 | 31 | 40 |
| 2019 | 27 | 54 |
| 2020 | 42 | 29 |
| 2021 | 30 | 43 |
| 2022 | 34 | 47 |
| 2023 | 37 | 24 |
| 2024 | 36 | 23 |
| 2025 | 21 | 17 |
| 2026 | 10 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F01N 2250/02Filtering and catalytic conversionIndexing code531
- F01N 2250/12Absorption or adsorption, and catalytic conversionIndexing code419
- F01N 2250/14Absorption or adsorption, and filteringIndexing code97
- F01N 2250/04Afterburning and catalytic conversionIndexing code55
- F01N 2250/06Afterburning and filteringIndexing code21
- F01N 2250/10Cooling and filteringIndexing code20
- F01N 2250/08Filtering and inertial particulate separationIndexing code15
Recent patents
- Post-combustion engine exhaust gases absorber18 Aug 2026US 12,710,005 B2
- Purification system21 Jul 2026US 12,687,123 B2Isuzu Motors Limited
- Reducing agent supply device, method for controlling reducing agent supply device, and control device14 Jul 2026US 12,680,487 B2Komatsu Ltd.
- Exhaust component14 Jul 2026US 12,680,492 B2Futaba Industrial Co., Ltd.
- Catalytic heater for an exhaust gas system of an internal combustion engine, exhaust gas system and method of operating an exhaust gas system23 Jun 2026US 12,662,955 B2Purem GmbH
- Honeycomb structure20 Aug 2026US 2026/0241375 A1NGK Insulators, Ltd.
- System and method for treatment of an exhaust stream and control system therefor23 Jul 2026US 2026/0210279 A1Scania CV AB
- Exhaust system for fire fighting vehicle2 Jul 2026US 2026/0185471 A1Oshkosh Corporation
- Exhaust system for fire fighting vehicle2 Jul 2026US 2026/0185472 A1Oshkosh Corporation
- Exhaust system for fire fighting vehicle2 Jul 2026US 2026/0185474 A1Oshkosh Corporation
Most cited
By later US patents
- Treatment of diesel exhaust gases207US 4,902,487 AJohnson Matthey PLC · 1990
- Apparatus and method for internal combustion engine control173US 5,657,625 AMitsubishi Jidosha Kogyo Kabushiki Kaisha · 1997
- Method and apparatus for treating an engine exhaust gas stream154US 6,171,556 B2Engelhard Corporation · 2001
- Exhaust gas purification apparatus for an internal combustion engine149US 5,402,641 AToyota Jidosha Kabushiki Kaisha · 1995
- Exhaust gas purification system for low emission vehicle147US 6,167,696 AFord Motor Company · 2001