F01N 3/206
Adding periodically or continuously substances to exhaust gases for promoting purification
Official title: {Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents}
F01N3/206 (Adding periodically or continuously substances to exhaust gases for promoting purification) appears on 5,961 US grants and 7,172 published applications in this corpus.
Search patents in F01N- Granted patents
- 5,961
- Published applications
- 7,172
- Assignees
- 985
- Inventors
- 9,081
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 3 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 3 | 0 |
| 1987 | 2 | 0 |
| 1988 | 3 | 0 |
| 1989 | 2 | 0 |
| 1990 | 4 | 0 |
| 1991 | 2 | 0 |
| 1992 | 3 | 0 |
| 1993 | 11 | 0 |
| 1994 | 6 | 0 |
| 1995 | 11 | 0 |
| 1996 | 9 | 0 |
| 1997 | 15 | 0 |
| 1998 | 27 | 0 |
| 1999 | 23 | 0 |
| 2000 | 27 | 0 |
| 2001 | 42 | 15 |
| 2002 | 44 | 39 |
| 2003 | 31 | 58 |
| 2004 | 44 | 85 |
| 2005 | 54 | 73 |
| 2006 | 48 | 103 |
| 2007 | 40 | 181 |
| 2008 | 51 | 200 |
| 2009 | 83 | 297 |
| 2010 | 127 | 376 |
| 2011 | 157 | 387 |
| 2012 | 253 | 304 |
| 2013 | 336 | 395 |
| 2014 | 340 | 426 |
| 2015 | 430 | 556 |
| 2016 | 405 | 534 |
| 2017 | 497 | 505 |
| 2018 | 396 | 509 |
| 2019 | 528 | 439 |
| 2020 | 418 | 375 |
| 2021 | 378 | 306 |
| 2022 | 330 | 304 |
| 2023 | 264 | 224 |
| 2024 | 220 | 196 |
| 2025 | 203 | 161 |
| 2026 | 84 | 124 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Engine device6 Oct 2026US 12,753,713 B2Yanmar Holdings Co., Ltd.
- Desulfurization method29 Sep 2026US 12,747,685 B2Subaru Corporation
- Exhaust gas aftertreatment system with two SCR catalysts29 Sep 2026US 12,747,686 B1FEV Group GmbH
- Decomposition chamber for aftertreatment system22 Sep 2026US 12,742,406 B2Cummins Emission Solutions Inc.
- Display driving device comprising an emission circuit and positive feedback circuit22 Sep 2026US 12,742,407 B2Purem GmbH
- System for treating an exhaust gas8 Oct 2026US 2026/0307052 A1Johnson Matthey Public Limited Company
- Pressurized systems and methods for providing a nebulized catalyst8 Oct 2026US 2026/0309066 A1Jake Vernon LLC
- Containerized ultra-low nox diesel engine generator set with roof-mounted selective catalytic reduction system8 Oct 2026US 2026/0309075 A1Industrial Service Solutions WC, Inc.
- An exhaust gas treatment system for treating an exhaust gas stream exiting a gasoline engine1 Oct 2026US 2026/0295528 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 and apparatus for reducing nitrogen oxides from internal combustion engine207US 5,272,871 AKabushiki Kaisha Toyota Chuo Kenkyusho · 1993
- System comprising duel-fuel and after treatment for heavy-heavy duty diesel (HHDD) engines180US 10,287,943 B1Clean Power Technologies, LLC · 2019
- Reducing no.sub.x emissions from an engine by temperature-controlled urea injection for selective catalytic reduction171US 6,063,350 AClean Diesel Technologies, Inc. · 2000
- Method of and control for monitoring and controlling an electric motor for driving a pump170US 10,018,096 B2Maxon Motor AG · 2018
- Staged reductant injection for improved NO.sub.x reduction157US 6,125,629 AEngelhard Corporation · 2000