F01M 13/021
Of negative pressure
Official title: {of negative pressure}
F01M13/021 (Of negative pressure) appears on 627 US grants and 525 published applications in this corpus.
Search patents in F01M- Granted patents
- 627
- Published applications
- 525
- Assignees
- 227
- Inventors
- 1,255
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 3 | 0 |
| 1978 | 5 | 0 |
| 1979 | 6 | 0 |
| 1980 | 5 | 0 |
| 1981 | 5 | 0 |
| 1982 | 2 | 0 |
| 1983 | 4 | 0 |
| 1984 | 2 | 0 |
| 1985 | 8 | 0 |
| 1986 | 5 | 0 |
| 1987 | 7 | 0 |
| 1988 | 4 | 0 |
| 1989 | 5 | 0 |
| 1990 | 6 | 0 |
| 1991 | 2 | 0 |
| 1992 | 5 | 0 |
| 1993 | 5 | 0 |
| 1994 | 5 | 0 |
| 1995 | 6 | 0 |
| 1996 | 14 | 0 |
| 1997 | 5 | 0 |
| 1998 | 5 | 0 |
| 1999 | 11 | 0 |
| 2000 | 17 | 0 |
| 2001 | 15 | 7 |
| 2002 | 14 | 9 |
| 2003 | 12 | 11 |
| 2004 | 18 | 18 |
| 2005 | 9 | 10 |
| 2006 | 12 | 11 |
| 2007 | 11 | 15 |
| 2008 | 10 | 15 |
| 2009 | 10 | 24 |
| 2010 | 8 | 25 |
| 2011 | 19 | 28 |
| 2012 | 24 | 17 |
| 2013 | 14 | 17 |
| 2014 | 20 | 30 |
| 2015 | 28 | 33 |
| 2016 | 23 | 35 |
| 2017 | 24 | 30 |
| 2018 | 34 | 28 |
| 2019 | 27 | 24 |
| 2020 | 42 | 46 |
| 2021 | 38 | 19 |
| 2022 | 23 | 17 |
| 2023 | 14 | 11 |
| 2024 | 19 | 10 |
| 2025 | 11 | 17 |
| 2026 | 3 | 18 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Dry sump engine29 Sep 2026US 12,747,683 B2Toyota Jidosha Kabushiki Kaisha
- Crankcase pressure regulator having umbrella style valve8 Sep 2026US 12,729,637 B2Solberg Mfg., Inc.
- Blow-by gas processing apparatus, internal combustion engine, and supercharger18 Aug 2026US 12,710,003 B2IHI Corporation
- Blow-by gas recirculation device9 Dec 2025US 12,492,652 B2Toyota Jidosha Kabushiki Kaisha
- Engine device2 Dec 2025US 12,486,793 B2Yanmar Holdings Co., Ltd.
- Oil separator structure for blow-by gas recirculation system, and vehicle1 Oct 2026US 2026/0295464 A1Isuzu Motors Limited
- Ventilation system17 Sep 2026US 2026/0275889 A1Toyota Jidosha Kabushiki Kaisha
- Internal Combustion Engine for a Motor Vehicle13 Aug 2026US 2026/0235057 A1Bayerische Motoren Werke Aktiengesellschaft
- System and control method6 Aug 2026US 2026/0226853 A1Komatsu Ltd.
- Method and control arrangement for estimating a crankcase ventilation flow rate30 Jul 2026US 2026/0218638 A1Scania CV AB
Most cited
By later US patents
- Crankcase emission control system100US 5,564,401 ADiesel Research Inc. · 1996
- Oil separator for reducing oil losses from crankcase ventilation71US 5,450,835 ACummins Engine Company, Inc. · 1995
- Crankcase ventilation system65US 6,123,061 ACummins Engine Company, Inc. · 2000
- Dry sump crankcase60US 4,674,457 AFord Motor Company · 1987
- Air-oil separator and method of separation58US 4,269,607 A1981