B25B 27/12
Mounting or demounting piston rings
Official title: mounting or demounting piston rings
B25B27/12 (Mounting or demounting piston rings) appears on 38 US grants and 20 published applications in this corpus.
Search patents in B25B- Granted patents
- 38
- Published applications
- 20
- Assignees
- 23
- Inventors
- 86
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 3 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 2 | 1 |
| 2003 | 2 | 0 |
| 2004 | 3 | 2 |
| 2005 | 0 | 3 |
| 2006 | 2 | 0 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 0 |
| 2014 | 1 | 2 |
| 2015 | 0 | 1 |
| 2016 | 2 | 2 |
| 2017 | 0 | 1 |
| 2018 | 0 | 0 |
| 2019 | 1 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 2 |
| 2022 | 0 | 0 |
| 2023 | 1 | 2 |
| 2024 | 1 | 1 |
| 2025 | 3 | 1 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Piston alignment tool15 Sep 2026US 12,734,659 B2Federal-Mogul Motorparts LLC
- Piston ring cutting-off device27 Jan 2026US 12,533,758 B2Tpr Co., Ltd.
- Piston ring installation tool8 Apr 2025US 12,269,148 B2Cummins Inc.
- Wheel assembly including gas spring piston biasing member and related methods18 Mar 2025US 12,251,964 B2Gacw Incorporated
- Piston ring installation jig and piston ring installation method using the jig4 Feb 2025US 12,214,458 B2Subaru Corporation
- Ring change tooling and methods27 Aug 2026US 2026/0249435 A1
- Piston alignment tool24 Jul 2025US 2025/0235996 A1Federal-Mogul Motorparts LLC
- Piston ring installation jig and piston ring installation method using the jig14 Mar 2024US 2024/0082965 A1Subaru Corporation
- Piston Ring Cutting-Off Device28 Dec 2023US 2023/0415283 A1Tpr Co., Ltd.
- Wheel assembly including gas spring piston biasing member and related methods14 Sep 2023US 2023/0286315 A1Gacw Incorporated
Most cited
By later US patents
- Pliers for crimping work pieces16US 7,155,954 B2Wezag GmbH Werkzeugfabrik · 2007
- Lock ring assembly and disassembly method13US 4,744,132 AUnit Rig & Equipment Co. · 1988
- Method of assembling piston ring and method of assembling set oil ring and apparatus for assembling set oil ring13US 5,303,465 AHonda Giken Kogyo Kabushiki Kaisha · 1994
- Piston pin lock ring insertion tool and method11US 6,789,313 B22004
- Machine for the automatic fitting of piston rings onto pistons10US 5,259,109 AFloquet Monopole · 1993