F02F 5/00
Piston rings
Official title: Piston rings, e.g. associated with piston crown
F02F5/00 (Piston rings) appears on 93 US grants and 124 published applications in this corpus.
Search patents in F02F- Granted patents
- 93
- Published applications
- 124
- Assignees
- 43
- Inventors
- 217
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 5 |
| 2008 | 0 | 1 |
| 2009 | 0 | 1 |
| 2010 | 0 | 2 |
| 2011 | 0 | 1 |
| 2012 | 1 | 0 |
| 2013 | 3 | 10 |
| 2014 | 1 | 5 |
| 2015 | 1 | 9 |
| 2016 | 8 | 7 |
| 2017 | 8 | 6 |
| 2018 | 4 | 15 |
| 2019 | 15 | 8 |
| 2020 | 11 | 16 |
| 2021 | 9 | 10 |
| 2022 | 10 | 4 |
| 2023 | 8 | 6 |
| 2024 | 5 | 5 |
| 2025 | 6 | 7 |
| 2026 | 1 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Piston ring set28 Jul 2026US 12,692,938 B2
- Oil scraper ring for pistons of an internal combustion engine2 Dec 2025US 12,486,897 B2Federal-Mogul Burscheid GmbH
- Piston unit, top land member, and combination of piston unit parts19 Aug 2025US 12,392,301 B2Tpr Co., Ltd.
- Oil ring wire22 Jul 2025US 12,365,959 B2Tokusen Kogyo Co., Ltd.
- Piston assembly with gapless oil control ring6 May 2025US 12,292,013 B2DeltaHawk Engines, Inc.
- Piston and internal combustion engine8 Oct 2026US 2026/0309104 A1Mahle International GmbH
- Internal combustion engine and vehicle11 Jun 2026US 2026/0160218 A1Isuzu Motors Limited
- Compression Ring30 Apr 2026US 2026/0117866 A1Tpr Co., Ltd.
- Piston ring set30 Apr 2026US 2026/0117867 A1Riken
- Oil control ring26 Feb 2026US 2026/0055813 A1Riken
Most cited
By later US patents
- Combination of cylinder liner and piston ring of internal combustion engine30US 6,553,957 B1Hino Motors, Ltd. · 2003
- Sliding assembly6US 9,915,220 B2Mahle International GmbH · 2018
- Piston seal with solid lubricant applicator5US 10,927,953 B2Mainspring Energy, Inc. · 2021
- Combination oil ring5US 9,784,369 B2Tpr Co., Ltd. · 2017
- Reciprocating piston4US 4,313,368 ASociete Civile Promeyrat-Casteilla · 1982