F02M 35/09
Clogging indicators
Official title: Clogging indicators {; Diagnosis or testing of air cleaners (sensors therefore F02M35/10373)}
F02M35/09 (Clogging indicators) appears on 106 US grants and 91 published applications in this corpus.
Search patents in F02M- Granted patents
- 106
- Published applications
- 91
- Assignees
- 54
- Inventors
- 222
- Latest grant
- 2 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 3 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 7 | 1 |
| 2002 | 0 | 0 |
| 2003 | 1 | 2 |
| 2004 | 1 | 2 |
| 2005 | 1 | 1 |
| 2006 | 0 | 3 |
| 2007 | 1 | 2 |
| 2008 | 3 | 6 |
| 2009 | 6 | 4 |
| 2010 | 1 | 1 |
| 2011 | 3 | 3 |
| 2012 | 0 | 2 |
| 2013 | 3 | 2 |
| 2014 | 1 | 3 |
| 2015 | 1 | 8 |
| 2016 | 6 | 8 |
| 2017 | 4 | 7 |
| 2018 | 6 | 4 |
| 2019 | 9 | 6 |
| 2020 | 8 | 5 |
| 2021 | 2 | 7 |
| 2022 | 9 | 7 |
| 2023 | 5 | 3 |
| 2024 | 5 | 1 |
| 2025 | 1 | 2 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Active precleaner system and methods of use2 Jun 2026US 12,643,066 B2Donaldson Company, Inc.
- Internal combustion engine monitoring system21 Oct 2025US 12,448,938 B2Caterpillar Inc.
- Filtration systems with multitiered data exchange capabilities5 Nov 2024US 12,136,299 B2Donaldson Company, Inc.
- Filter restriction indicator22 Oct 2024US 12,124,253 B2Donaldson Company, Inc.
- Monitoring system, method and vehicle comprising such a system, for detecting clogging through fouling of an air filter of an internal combustion engine15 Oct 2024US 12,116,963 B2DAF Trucks N. V.
- Active precleaner system and methods of use24 Sep 2026US 2026/0284565 A1Donaldson Company, Inc.
- Automotive Snorkel Incorporating an Air Filtration System27 Feb 2025US 2025/0065709 A1Work Air Technologies Pty Ltd
- Internal combustion engine monitoring system2 Jan 2025US 2025/0003376 A1Caterpillar Inc.
- Cyclonic Flow Air Cleaner Assemblies11 Jul 2024US 2024/0229749 A1FNA Group, Inc.
- Air cleaner degradation degree estimation device and air cleaner degradation degree estimation method10 Aug 2023US 2023/0250782 A1Toyota Jidosha Kabushiki Kaisha
Most cited
By later US patents
- Dirt accumulation indicator for air intake filters123US 4,688,511 AFilterwerk Mann & Hummel GmbH · 1987
- Device for the detection of the clogging of an air filter72US 5,429,649 A1995
- Maintenance alert system for heavy-duty trucks55US 6,172,602 B2Detroit Diesel Corporation · 2001
- Apparatus and method for detecting a plugged air filter on an engine45US 5,604,306 ACaterpillar Inc. · 1997
- Air filter diagnostic41US 5,606,311 AGeneral Motors Corporation · 1997