F02F 3/26
Pistons: having combustion chamber in piston head
Official title: having combustion chamber in piston head (the surface thereof being covered F02F3/14)
F02F3/26 (Pistons: having combustion chamber in piston head) appears on 453 US grants and 309 published applications in this corpus.
Search patents in F02F- Granted patents
- 453
- Published applications
- 309
- Assignees
- 155
- Inventors
- 958
- Latest grant
- 12 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 3 | 0 |
| 1981 | 2 | 0 |
| 1982 | 4 | 0 |
| 1983 | 3 | 0 |
| 1984 | 4 | 0 |
| 1985 | 6 | 0 |
| 1986 | 4 | 0 |
| 1987 | 2 | 0 |
| 1988 | 5 | 0 |
| 1989 | 3 | 0 |
| 1990 | 8 | 0 |
| 1991 | 7 | 0 |
| 1992 | 6 | 0 |
| 1993 | 11 | 0 |
| 1994 | 10 | 0 |
| 1995 | 3 | 0 |
| 1996 | 6 | 0 |
| 1997 | 7 | 0 |
| 1998 | 23 | 0 |
| 1999 | 19 | 0 |
| 2000 | 26 | 0 |
| 2001 | 23 | 3 |
| 2002 | 26 | 24 |
| 2003 | 25 | 15 |
| 2004 | 16 | 16 |
| 2005 | 16 | 9 |
| 2006 | 8 | 6 |
| 2007 | 2 | 6 |
| 2008 | 8 | 5 |
| 2009 | 0 | 5 |
| 2010 | 3 | 4 |
| 2011 | 4 | 6 |
| 2012 | 1 | 4 |
| 2013 | 3 | 11 |
| 2014 | 1 | 6 |
| 2015 | 6 | 11 |
| 2016 | 7 | 17 |
| 2017 | 7 | 24 |
| 2018 | 13 | 22 |
| 2019 | 29 | 22 |
| 2020 | 26 | 45 |
| 2021 | 24 | 15 |
| 2022 | 14 | 10 |
| 2023 | 10 | 7 |
| 2024 | 8 | 3 |
| 2025 | 4 | 6 |
| 2026 | 3 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Piston and injector for reduced head thermal loading12 May 2026US 12,624,671 B1Deere & Company
- Combustion device for an engine and method for designing a piston14 Apr 2026US 12,601,308 B2Weichai Power Co., Ltd.
- Engine having hotspot fuel igniter and piston and methodology using same3 Mar 2026US 12,565,865 B2Caterpillar Inc.
- Piston and an internal combustion engine system14 Oct 2025US 12,442,347 B2Volvo Truck Corporation
- Opposed-piston engine17 Jun 2025US 12,331,675 B2Mitsubishi Heavy Industries, Ltd.
- A piston and an internal combustion engine system3 Sep 2026US 2026/0258766 A1Volvo Truck Corporation
- Piston and Internal Combustion Engine3 Sep 2026US 2026/0258767 A1KS Kolbenschmidt GmbH
- Piston Bowl For An Internal Combustion Engine20 Aug 2026US 2026/0243215 A1Perkins Engines Company Limited
- Gaseous fuel combustion system and method utilizing a piston reentrant feature for hastened fuel-air mixing16 Jul 2026US 2026/0201829 A1Caterpillar Inc.
- Internal combustion engine18 Jun 2026US 2026/0168459 A1Isuzu Motors Limited
Most cited
By later US patents
- Plasma jet ignition engine and method122US 4,203,393 AFord Motor Company · 1980
- In-cylinder direct-injection spark-ignition engine98US 6,138,639 ANissan Motor Co., Ltd. · 2000
- Spark-assist type self-ignition engine92US 6,293,246 B1Toyota Jidosha Kabushiki Kaisha · 2001
- Direct fuel injection type spark ignition internal combustion engine having a squish flow for assisting fuel evaporation75US 4,920,937 AToyota Jidosha Kabushiki Kaisha · 1990
- Internal combustion engine66US 5,207,058 AToyota Jidosha Kabushiki Kaisha · 1993