B23P 15/08
Piston rings from several pieces
Official title: piston rings from several pieces
B23P15/08 (Piston rings from several pieces) appears on 23 US grants and 11 published applications in this corpus.
Search patents in B23P- Granted patents
- 23
- Published applications
- 11
- Assignees
- 16
- Inventors
- 31
- Latest grant
- 24 Feb 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 3 | 0 |
| 1981 | 3 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 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 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 1 |
| 2015 | 1 | 2 |
| 2016 | 0 | 0 |
| 2017 | 0 | 1 |
| 2018 | 2 | 1 |
| 2019 | 0 | 1 |
| 2020 | 0 | 1 |
| 2021 | 1 | 1 |
| 2022 | 0 | 0 |
| 2023 | 1 | 1 |
| 2024 | 1 | 0 |
| 2025 | 0 | 1 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Piston sealing ring assembly having a gap cover element24 Feb 2026US 12,560,235 B2Mainspring Energy, Inc.
- Piston sealing ring assembly having a gap cover element3 Sep 2024US 12,078,249 B2Mainspring Energy, Inc.
- Piston sealing ring assembly having a gap cover element26 Sep 2023US 11,767,915 B2Mainspring Energy, Inc.
- Piston sealing ring assembly having a gap cover element13 Apr 2021US 10,975,966 B2Mainspring Energy, Inc.
- Compression piston ring for an internal combustion engine30 Oct 2018US 10,113,643 B2Ford Global Technologies, LLC
- Piston sealing ring assembly having a gap cover element13 Aug 2026US 2026/0235203 A1Mainspring Energy, Inc.
- Piston sealing ring assembly having a gap cover element27 Feb 2025US 2025/0067340 A1Mainspring Energy, Inc.
- Piston sealing ring assembly having a gap cover element23 Nov 2023US 2023/0375086 A1Mainspring Energy, Inc.
- Piston sealing ring assembly having a gap cover element16 Dec 2021US 2021/0388901 A1Mainspring Energy, Inc.
- Fluid pump having a piston and a supporting body bearing the piston for sealing20 Aug 2020US 2020/0263684 A1Agilent Technologies, Inc.
Most cited
By later US patents
- Piston ring and method of making same20US 4,299,401 ARamsey Corporation · 1981
- Piston ring with a Cr-C-Fe inlaid ring in its outer surface, and a method of making it11US 4,323,257 AToyota Jidosha Kogyo Kabushiki Kaisha · 1982
- Reduced compression height piston and piston assembly therewith and methods of construction thereof9US 9,127,618 B2Federal-Mogul Corporation · 2015
- Coupled piston ring method of manufacture8US 3,991,455 A1976
- Method for manufacturing fully sealed piston ring8US 4,192,051 A1980