B23P 15/06
Piston rings from one piece
Official title: piston rings from one piece
B23P15/06 (Piston rings from one piece) appears on 67 US grants and 43 published applications in this corpus.
Search patents in B23P- Granted patents
- 67
- Published applications
- 43
- Assignees
- 32
- Inventors
- 139
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 1 | 0 |
| 1978 | 4 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 3 | 0 |
| 1995 | 3 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 3 | 0 |
| 1999 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 1 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 0 |
| 2012 | 0 | 3 |
| 2013 | 0 | 7 |
| 2014 | 1 | 5 |
| 2015 | 6 | 3 |
| 2016 | 7 | 5 |
| 2017 | 4 | 5 |
| 2018 | 2 | 3 |
| 2019 | 4 | 2 |
| 2020 | 0 | 4 |
| 2021 | 5 | 0 |
| 2022 | 0 | 2 |
| 2023 | 1 | 0 |
| 2024 | 0 | 1 |
| 2025 | 0 | 0 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- O-ring installation device15 Sep 2026US 12,734,658 B1Caterpillar Inc.
- Wire for piston ring, and manufacturing method of piston ring14 Mar 2023US 11,603,929 B2Tpr Co., Ltd.
- Piston ring and method for manufacturing a piston ring2 Nov 2021US 11,162,587 B2Mahle International GmbH
- Piston ring with inlaid DLC coating and method of manufacturing13 Jul 2021US 11,060,608 B2Tenneco Inc.
- Method for producing a piston ring13 Jul 2021US 11,060,609 B2Federal-Mogul Burscheid GmbH
- Piston ring and method for manufacturing a piston ring19 Feb 2026US 2026/0049659 A1Mahle International GmbH
- Compression Ring Having Butt Seal, and Method14 Nov 2024US 2024/0376982 A1Federal-Mogul Burscheid GmbH
- Piston ring and method for manufacturing a piston ring20 Oct 2022US 2022/0333687 A1Mahle International GmbH
- Wire for piston ring, and manufacturing method of piston ring12 May 2022US 2022/0145990 A1Tpr Co., Ltd.
- Magnetorheological support method for blisk processing3 Dec 2020US 2020/0376571 A1Dalian University of Technology
Most cited
By later US patents
- Piston ring assembly and method of making same18US 4,123,072 ADana Corporation · 1978
- Hybrid face coating for piston ring17US 5,605,741 ADana Corporation · 1997
- Method of making a rolled metal piston ring15US 4,085,490 ARamsey Corporation · 1978
- Method and apparatus for forming angle ring flanges15US 4,361,021 AUnited McGill Corporation · 1982
- Ring manufacture, productive of face contact seal10US 3,980,310 AInternational Harvester Company · 1976