F02F 3/28
Pistons: other pistons with specially-shaped head
Official title: Other pistons with specially-shaped head
F02F3/28 (Pistons: other pistons with specially-shaped head) appears on 313 US grants and 275 published applications in this corpus.
Search patents in F02F- Granted patents
- 313
- Published applications
- 275
- Assignees
- 131
- Inventors
- 658
- Latest grant
- 23 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 5 | 0 |
| 1979 | 3 | 0 |
| 1980 | 0 | 0 |
| 1981 | 4 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 3 | 0 |
| 1985 | 8 | 0 |
| 1986 | 7 | 0 |
| 1987 | 6 | 0 |
| 1988 | 5 | 0 |
| 1989 | 4 | 0 |
| 1990 | 6 | 0 |
| 1991 | 2 | 0 |
| 1992 | 7 | 0 |
| 1993 | 2 | 0 |
| 1994 | 3 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 3 | 0 |
| 1998 | 3 | 0 |
| 1999 | 2 | 0 |
| 2000 | 4 | 0 |
| 2001 | 5 | 0 |
| 2002 | 2 | 1 |
| 2003 | 2 | 1 |
| 2004 | 1 | 2 |
| 2005 | 1 | 2 |
| 2006 | 0 | 3 |
| 2007 | 1 | 19 |
| 2008 | 11 | 2 |
| 2009 | 6 | 7 |
| 2010 | 8 | 3 |
| 2011 | 3 | 8 |
| 2012 | 2 | 4 |
| 2013 | 2 | 6 |
| 2014 | 4 | 8 |
| 2015 | 6 | 14 |
| 2016 | 9 | 29 |
| 2017 | 15 | 31 |
| 2018 | 28 | 31 |
| 2019 | 24 | 13 |
| 2020 | 24 | 25 |
| 2021 | 20 | 17 |
| 2022 | 20 | 11 |
| 2023 | 7 | 11 |
| 2024 | 13 | 5 |
| 2025 | 9 | 8 |
| 2026 | 4 | 14 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Profiled cover plate for a piston23 Jun 2026US 12,662,976 B2Cummins Inc.
- Piston and injector for reduced head thermal loading12 May 2026US 12,624,671 B1Deere & Company
- Engine having hotspot fuel igniter and piston and methodology using same3 Mar 2026US 12,565,865 B2Caterpillar Inc.
- Engine system, piston, and operating method for pseudo-tumble mixing of hydrogen fuel and air6 Jan 2026US 12,516,648 B2Caterpillar Inc.
- Internal combustion engine system30 Dec 2025US 12,510,035 B2Volvo Truck Corporation
- Spark ignition engine and method for operating spark ignition engine17 Sep 2026US 2026/0275932 A1Mazda Motor Corporation
- Direct injection-type internal combustion engine3 Sep 2026US 2026/0258768 A1Mitsubishi Jidosha Kogyo Kabushiki Kaisha
- 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.
- Piston for reciprocating within a cylinder in an internal combustion engine18 Jun 2026US 2026/0168460 A1Cummins Inc.
Most cited
By later US patents
- Ceramic insulated engine pistons52US 4,245,611 AGeneral Motors Corporation · 1981
- Internal combustion engine using dynamic resonating air chamber50US 4,788,942 ASonex Research, Inc. · 1988
- Combustion chamber for internal combustion engine and process of combustion using fuel radical species42US 5,322,042 ASonex Research, Inc. · 1994
- Internal combustion piston engine using air chamber in piston driven in resonance with combustion wave frequency34US 4,592,318 ASonex Research, Inc. · 1986
- Open chamber diesel engine having a piston with recesses therein33US 5,285,755 AChrysler Corporation · 1994