F01N 1/089
Using two or more expansion chambers in series
Official title: {using two or more expansion chambers in series (F01N1/083, F01N1/084, F01N1/086 take precedence)}
F01N1/089 (Using two or more expansion chambers in series) appears on 350 US grants and 254 published applications in this corpus.
Search patents in F01N- Granted patents
- 350
- Published applications
- 254
- Assignees
- 165
- Inventors
- 729
- Latest grant
- 21 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 7 | 0 |
| 1981 | 3 | 0 |
| 1982 | 4 | 0 |
| 1983 | 3 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 6 | 0 |
| 1990 | 7 | 0 |
| 1991 | 5 | 0 |
| 1992 | 6 | 0 |
| 1993 | 10 | 0 |
| 1994 | 2 | 0 |
| 1995 | 6 | 0 |
| 1996 | 4 | 0 |
| 1997 | 10 | 0 |
| 1998 | 10 | 0 |
| 1999 | 14 | 0 |
| 2000 | 7 | 0 |
| 2001 | 12 | 2 |
| 2002 | 9 | 14 |
| 2003 | 12 | 11 |
| 2004 | 9 | 14 |
| 2005 | 9 | 14 |
| 2006 | 6 | 11 |
| 2007 | 5 | 6 |
| 2008 | 10 | 13 |
| 2009 | 6 | 9 |
| 2010 | 11 | 15 |
| 2011 | 12 | 6 |
| 2012 | 8 | 8 |
| 2013 | 7 | 10 |
| 2014 | 11 | 12 |
| 2015 | 18 | 14 |
| 2016 | 6 | 10 |
| 2017 | 16 | 9 |
| 2018 | 3 | 10 |
| 2019 | 9 | 19 |
| 2020 | 9 | 16 |
| 2021 | 11 | 8 |
| 2022 | 19 | 8 |
| 2023 | 9 | 6 |
| 2024 | 4 | 4 |
| 2025 | 6 | 4 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Muffler and method for making a muffler9 Dec 2025US 12,492,653 B2Purem GmbH
- Muffler, exhaust system including a muffler, and method of making a muffler for an exhaust system11 Nov 2025US 12,467,392 B2Purem GmbH
- Sound damper28 Oct 2025US 12,454,901 B2Purem GmbH
- Flow conditioner for severe flow disturbances29 Jul 2025US 12,372,391 B2Honeywell International Inc.
- Exhaust muffler2 Apr 2026US 2026/0092545 A1Tenneco Automotive Operating Company Inc.
- Convertible silencer25 Dec 2025US 2025/0389215 A1Discovery Energy, LLC
- Muffler10 Apr 2025US 2025/0116216 A1Purem GmbH
- Convertible silencer6 Feb 2025US 2025/0043706 A1Discovery Energy, LLC
- Muffler and outlet stub for a muffler9 Jan 2025US 2025/0012208 A1Andreas Stihl AG & CO.KG
Most cited
By later US patents
- Exhaust muffler174US 4,880,078 AHonda Giken Kogyo Kabushiki Kaisha · 1989
- Noise silencer97US 4,109,751 ADeere & Company · 1978
- Exhaust silencer for a railway locomotive81US 4,203,503 ACentro Richerche Fiat S.p.A. · 1980
- Exhaust silencer for an agricultural tractor78US 4,209,076 ACentro Ricerche Fiat S.p.A. · 1980
- Compressor muffler77US 4,330,239 ATecumseh Products Company · 1982