F02F 3/22
The fluid being liquid
Official title: the fluid being liquid
F02F3/22 (The fluid being liquid) appears on 511 US grants and 501 published applications in this corpus.
Search patents in F02F- Granted patents
- 511
- Published applications
- 501
- Assignees
- 136
- Inventors
- 723
- Latest grant
- 23 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 4 | 0 |
| 1979 | 3 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 5 | 0 |
| 1983 | 4 | 0 |
| 1984 | 1 | 0 |
| 1985 | 9 | 0 |
| 1986 | 5 | 0 |
| 1987 | 8 | 0 |
| 1988 | 3 | 0 |
| 1989 | 6 | 0 |
| 1990 | 4 | 0 |
| 1991 | 7 | 0 |
| 1992 | 6 | 0 |
| 1993 | 3 | 0 |
| 1994 | 6 | 0 |
| 1995 | 2 | 0 |
| 1996 | 3 | 0 |
| 1997 | 2 | 0 |
| 1998 | 7 | 0 |
| 1999 | 5 | 0 |
| 2000 | 4 | 0 |
| 2001 | 11 | 3 |
| 2002 | 14 | 11 |
| 2003 | 12 | 9 |
| 2004 | 13 | 11 |
| 2005 | 8 | 11 |
| 2006 | 10 | 11 |
| 2007 | 6 | 12 |
| 2008 | 9 | 20 |
| 2009 | 8 | 19 |
| 2010 | 10 | 22 |
| 2011 | 18 | 27 |
| 2012 | 17 | 28 |
| 2013 | 14 | 33 |
| 2014 | 25 | 32 |
| 2015 | 22 | 39 |
| 2016 | 28 | 42 |
| 2017 | 32 | 45 |
| 2018 | 28 | 35 |
| 2019 | 42 | 27 |
| 2020 | 30 | 20 |
| 2021 | 17 | 9 |
| 2022 | 12 | 13 |
| 2023 | 8 | 5 |
| 2024 | 8 | 4 |
| 2025 | 5 | 8 |
| 2026 | 2 | 5 |
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.
- Steel piston for an internal combustion engine24 Mar 2026US 12,584,453 B2Federal-Mogul Nurnberg GmbH
- Piston bearing assembly for an opposed-piston engine30 Dec 2025US 12,510,015 B2General Atomics Aeronautical Systems, Inc.
- Connecting rod, piston, crank drive, and reciprocating internal combustion engine7 Oct 2025US 12,435,651 B2
- Lubrication system for a pin joint of an engine piston, an engine piston, and a method of lubricating a pin joint of an engine piston12 Aug 2025US 12,385,447 B2Cummins Inc.
- Piston and engine9 Jul 2026US 2026/0194026 A1Baudouin (Weifang) Power Co., Ltd.
- A piston head for combustion cylinder, and a cooling gallery for a piston head of a combustion cylinder9 Jul 2026US 2026/0194027 A1Cummins Inc.
- Piston head and piston head assembly28 May 2026US 2026/0146574 A1Cummins Power Generation Inc.
- Piston, internal combustion engine, and vehicle23 Apr 2026US 2026/0110274 A1Isuzu Motors Limited
- Piston Assembly22 Jan 2026US 2026/0022677 A1DeltaHawk Engines, Inc.
Most cited
By later US patents
- External combustion slidable vane motor with air cushions149US 4,672,813 A1987
- Piston for internal combustion engines56US 4,581,983 AKarl Schmidt GmbH · 1986
- Two-piece piston assembly53US 4,377,967 AMack Trucks, Inc. · 1983
- Two-piece oil-cooled piston52US 4,180,027 AMack Trucks, Inc. · 1979
- Oil cooled piston47US 4,286,505 ACaterpillar Tractor Co. · 1981