F16J 9/00
Piston-rings
Official title: Piston-rings {, e.g. non-metallic piston-rings}, seats therefor; Ring sealings of similar construction (other sealings between pistons and cylinders F16J3/06, F16J15/16 {; manufacture of piston-rings B23P15/06, B23P15/08}; tools for mounting or removing piston-rings or the like B25B; piston sealing arrangements on brake master cylinders B60T11/236 {; sealing provided on pump pistons F04B53/143})
F16J9/00 (Piston-rings) appears on 1,272 US grants and 1,050 published applications in this corpus.
Search patents in F16J- Granted patents
- 1,272
- Published applications
- 1,050
- Assignees
- 480
- Inventors
- 2,054
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 24 | 0 |
| 1977 | 12 | 0 |
| 1978 | 23 | 0 |
| 1979 | 15 | 0 |
| 1980 | 19 | 0 |
| 1981 | 20 | 0 |
| 1982 | 27 | 0 |
| 1983 | 17 | 0 |
| 1984 | 22 | 0 |
| 1985 | 17 | 0 |
| 1986 | 24 | 0 |
| 1987 | 19 | 0 |
| 1988 | 14 | 0 |
| 1989 | 18 | 0 |
| 1990 | 24 | 0 |
| 1991 | 16 | 0 |
| 1992 | 18 | 0 |
| 1993 | 15 | 0 |
| 1994 | 13 | 0 |
| 1995 | 13 | 0 |
| 1996 | 9 | 0 |
| 1997 | 22 | 0 |
| 1998 | 17 | 0 |
| 1999 | 15 | 0 |
| 2000 | 20 | 0 |
| 2001 | 21 | 6 |
| 2002 | 20 | 19 |
| 2003 | 16 | 17 |
| 2004 | 13 | 26 |
| 2005 | 9 | 20 |
| 2006 | 17 | 22 |
| 2007 | 16 | 23 |
| 2008 | 12 | 32 |
| 2009 | 8 | 28 |
| 2010 | 14 | 34 |
| 2011 | 14 | 32 |
| 2012 | 21 | 36 |
| 2013 | 21 | 61 |
| 2014 | 27 | 50 |
| 2015 | 41 | 80 |
| 2016 | 58 | 64 |
| 2017 | 58 | 76 |
| 2018 | 58 | 61 |
| 2019 | 70 | 56 |
| 2020 | 53 | 70 |
| 2021 | 54 | 55 |
| 2022 | 47 | 43 |
| 2023 | 42 | 44 |
| 2024 | 38 | 38 |
| 2025 | 41 | 36 |
| 2026 | 30 | 21 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F16J 9/12Details700
- F16J 9/26Piston-rings: characterised by the use of particular materials418
- F16J 9/06Piston-rings: using separate springs or elastic elements expanding the rings297
- F16J 9/28Piston-rings: of non-metals120
- F16J 9/08Piston-rings: with expansion obtained by pressure of the medium62
- F16J 9/10Special members for adjusting the rings24
- F16J 9/02L-section rings23
- F16J 9/04Helical rings9
Recent patents
- Wear ring and wear ring arrangement29 Sep 2026US 12,747,788 B2Trelleborg Sealing Solutions Germany GmbH
- O-ring installation device15 Sep 2026US 12,734,658 B1Caterpillar Inc.
- Piston ring1 Sep 2026US 12,723,654 B2
- Seal assembly with anti-rotation feature25 Aug 2026US 12,716,490 B2Pratt & Whitney Canada Corp.
- Coating for a piston ring11 Aug 2026US 12,704,177 B2Mahle International GmbH
- Laser Treatment of Piston Seal Rings10 Sep 2026US 2026/0266370 A1Rtx Corporation
- 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.
- Method for reducing adhesive damage due to loss of lubrication in aerospace piston rings23 Jul 2026US 2026/0210257 A1Rtx Corporation
- Light weight hybrid piston seal ring16 Jul 2026US 2026/0201950 A1Rtx Corporation
Most cited
By later US patents
- Non-circular piston rings1,033US 4,957,212 AGoetze AG · 1990
- Process for coating a metallic surface with a wear-resistant material78US 4,218,494 ACentro Richerche Fiat S.p.A. · 1980
- Osmotic delivery systems and piston assemblies for use therein68US 7,682,356 B2Intarcia Therapeutics, Inc. · 2010
- Piston ring64US 6,325,385 B1Teikoku Piston Ring Co., Ltd. · 2001
- Osmotic delivery systems and piston assemblies for use therein57US 7,879,028 B2Intarcia Therapeutics, Inc. · 2011