F16J 9/20
Rings with special cross-section
Official title: Rings with special cross-section (L-section rings F16J9/02); Oil-scraping rings {(F16J9/06 takes precedence)}
F16J9/20 (Rings with special cross-section) appears on 328 US grants and 288 published applications in this corpus.
Search patents in F16J- Granted patents
- 328
- Published applications
- 288
- Assignees
- 146
- Inventors
- 575
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 4 | 0 |
| 1978 | 8 | 0 |
| 1979 | 4 | 0 |
| 1980 | 4 | 0 |
| 1981 | 2 | 0 |
| 1982 | 6 | 0 |
| 1983 | 2 | 0 |
| 1984 | 3 | 0 |
| 1985 | 3 | 0 |
| 1986 | 2 | 0 |
| 1987 | 4 | 0 |
| 1988 | 3 | 0 |
| 1989 | 3 | 0 |
| 1990 | 1 | 0 |
| 1991 | 6 | 0 |
| 1992 | 3 | 0 |
| 1993 | 6 | 0 |
| 1994 | 4 | 0 |
| 1995 | 5 | 0 |
| 1996 | 2 | 0 |
| 1997 | 5 | 0 |
| 1998 | 5 | 0 |
| 1999 | 2 | 0 |
| 2000 | 7 | 0 |
| 2001 | 6 | 3 |
| 2002 | 4 | 7 |
| 2003 | 4 | 3 |
| 2004 | 2 | 7 |
| 2005 | 3 | 3 |
| 2006 | 6 | 8 |
| 2007 | 4 | 5 |
| 2008 | 6 | 5 |
| 2009 | 4 | 2 |
| 2010 | 5 | 6 |
| 2011 | 1 | 7 |
| 2012 | 3 | 7 |
| 2013 | 5 | 17 |
| 2014 | 6 | 10 |
| 2015 | 11 | 18 |
| 2016 | 12 | 14 |
| 2017 | 18 | 28 |
| 2018 | 18 | 23 |
| 2019 | 16 | 15 |
| 2020 | 15 | 23 |
| 2021 | 19 | 17 |
| 2022 | 15 | 16 |
| 2023 | 17 | 12 |
| 2024 | 12 | 13 |
| 2025 | 12 | 13 |
| 2026 | 6 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Wear ring and wear ring arrangement29 Sep 2026US 12,747,788 B2Trelleborg Sealing Solutions Germany GmbH
- Seal assembly with anti-rotation feature25 Aug 2026US 12,716,490 B2Pratt & Whitney Canada Corp.
- Piston ring set28 Jul 2026US 12,692,938 B2
- Gas energized seal for Gifford-McMahon expander26 May 2026US 12,638,220 B2Sumitomo (Shi) Cryogenic of America, Inc.
- Packaging ring with wear opening21 Apr 2026US 12,607,262 B2Hoerbiger Wien GmbH
- Dual-Component Ring Seal for Gland of Hydraulic Piston11 Jun 2026US 2026/0160331 A1Specialized Seal Design and Distribution, Inc.
- Synchronous Rotation Gapless Piston Rings30 Apr 2026US 2026/0117865 A1LF International, 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
- Continuous piston rings for an internal combustion engine24US 6,065,438 ACaterpillar Inc. · 2000
- Stirling engine with improved sealing piston ring assembly23US 4,669,736 AStirling Thermal Motors, Inc. · 1987
- Piston ring employing elastomeric sealing member within the ring groove23US 5,474,307 A1995
- Flutter free piston ring assembly23US 5,598,763 AFord Motor Company · 1997
- Piston and piston rings set22US 4,516,481 A1985