F16J 9/06
Piston-rings: using separate springs or elastic elements expanding the rings
Official title: using separate springs {or elastic elements} expanding the rings; Springs therefor {; Expansion by wedging}
F16J9/06 (Piston-rings: using separate springs or elastic elements expanding the rings) appears on 297 US grants and 216 published applications in this corpus.
Search patents in F16J- Granted patents
- 297
- Published applications
- 216
- Assignees
- 122
- Inventors
- 503
- Latest grant
- 26 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 5 | 0 |
| 1978 | 11 | 0 |
| 1979 | 7 | 0 |
| 1980 | 8 | 0 |
| 1981 | 4 | 0 |
| 1982 | 3 | 0 |
| 1983 | 4 | 0 |
| 1984 | 6 | 0 |
| 1985 | 4 | 0 |
| 1986 | 8 | 0 |
| 1987 | 6 | 0 |
| 1988 | 5 | 0 |
| 1989 | 3 | 0 |
| 1990 | 3 | 0 |
| 1991 | 6 | 0 |
| 1992 | 5 | 0 |
| 1993 | 9 | 0 |
| 1994 | 4 | 0 |
| 1995 | 3 | 0 |
| 1996 | 4 | 0 |
| 1997 | 4 | 0 |
| 1998 | 7 | 0 |
| 1999 | 1 | 0 |
| 2000 | 3 | 0 |
| 2001 | 8 | 2 |
| 2002 | 3 | 6 |
| 2003 | 7 | 10 |
| 2004 | 5 | 6 |
| 2005 | 2 | 2 |
| 2006 | 5 | 9 |
| 2007 | 6 | 9 |
| 2008 | 4 | 6 |
| 2009 | 1 | 4 |
| 2010 | 4 | 6 |
| 2011 | 1 | 6 |
| 2012 | 3 | 4 |
| 2013 | 5 | 17 |
| 2014 | 4 | 13 |
| 2015 | 8 | 8 |
| 2016 | 10 | 6 |
| 2017 | 13 | 21 |
| 2018 | 13 | 11 |
| 2019 | 12 | 6 |
| 2020 | 6 | 14 |
| 2021 | 11 | 13 |
| 2022 | 9 | 10 |
| 2023 | 10 | 12 |
| 2024 | 15 | 5 |
| 2025 | 4 | 5 |
| 2026 | 2 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Axial three-way modulating valve26 May 2026US 12,638,089 B2Mueller Refrigeration, LLC
- Piston sealing ring assembly having a gap cover element24 Feb 2026US 12,560,235 B2Mainspring Energy, Inc.
- 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.
- Seal assembly for a rotary valve25 Feb 2025US 12,234,927 B2Microtecnica S.R.L.
- Seal assembly for build tanks20 Aug 2026US 2026/0243350 A1General Electric Company
- Piston sealing ring assembly having a gap cover element13 Aug 2026US 2026/0235203 A1Mainspring Energy, Inc.
- 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
- Stirling engine with improved piston ring assembly30US 4,615,261 AStirling Thermal Motors, Inc. · 1986
- Compound seal with pressure equalization aperture27US 4,681,327 ASociete Nationale d'Etude et de Construction de Moteurs D'Aviation "S.N.E.C.M A." · 1987
- Sealing arrangement24US 4,252,331 ARobert Bosch GmbH · 1981
- Stirling engine with improved sealing piston ring assembly23US 4,669,736 AStirling Thermal Motors, Inc. · 1987
- Cryogenic refrigerator and regenerative heat exchange material23US 5,447,034 AKabushiki Kaisha Toshiba · 1995