F16J 9/28
Piston-rings: of non-metals
Official title: of non-metals
F16J9/28 (Piston-rings: of non-metals) appears on 120 US grants and 97 published applications in this corpus.
Search patents in F16J- Granted patents
- 120
- Published applications
- 97
- Assignees
- 83
- Inventors
- 239
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 2 | 0 |
| 1980 | 2 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 4 | 0 |
| 1987 | 4 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 3 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 5 | 0 |
| 1998 | 2 | 0 |
| 1999 | 4 | 0 |
| 2000 | 2 | 0 |
| 2001 | 5 | 0 |
| 2002 | 3 | 0 |
| 2003 | 1 | 1 |
| 2004 | 0 | 1 |
| 2005 | 0 | 1 |
| 2006 | 0 | 0 |
| 2007 | 0 | 5 |
| 2008 | 0 | 4 |
| 2009 | 2 | 2 |
| 2010 | 1 | 1 |
| 2011 | 2 | 1 |
| 2012 | 1 | 2 |
| 2013 | 1 | 5 |
| 2014 | 1 | 2 |
| 2015 | 3 | 8 |
| 2016 | 6 | 14 |
| 2017 | 6 | 6 |
| 2018 | 7 | 3 |
| 2019 | 6 | 5 |
| 2020 | 3 | 8 |
| 2021 | 4 | 8 |
| 2022 | 6 | 4 |
| 2023 | 6 | 6 |
| 2024 | 0 | 3 |
| 2025 | 8 | 5 |
| 2026 | 4 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Wear ring and wear ring arrangement29 Sep 2026US 12,747,788 B2Trelleborg Sealing Solutions Germany GmbH
- Sealing ring assemblies configured for pressure locking19 May 2026US 12,631,163 B2Mainspring Engergy, Inc.
- Piston ring17 Mar 2026US 12,578,017 B2Ntn Corporation
- Compressor20 Jan 2026US 12,529,375 B2Hitachi Industrial Equipment Systems Co., Ltd.
- Electrically conductive dynamic sealing element, its manufacturing method and sealing system4 Nov 2025US 12,460,726 B2Hutchinson
- Dual-Component Ring Seal for Gland of Hydraulic Piston11 Jun 2026US 2026/0160331 A1Specialized Seal Design and Distribution, Inc.
- High temperature sealing system for an axially expanding volume22 Jan 2026US 2026/0022799 A1Raytheon Company
- Piston ring6 Nov 2025US 2025/0341253 A1Ntn Corporation
- Sealing ring assemblies configured for pressure locking7 Aug 2025US 2025/0250970 A1Mainspring Energy, Inc.
- Compressor12 Jun 2025US 2025/0188921 A1Hitachi Industrial Equipment Systems Co., Ltd.
Most cited
By later US patents
- Osmotic delivery systems and piston assemblies for use therein68US 7,682,356 B2Intarcia Therapeutics, Inc. · 2010
- Osmotic delivery systems and piston assemblies for use therein57US 7,879,028 B2Intarcia Therapeutics, Inc. · 2011
- Osmotic delivery systems and piston assemblies for use therein42US 8,801,700 B2Intarcia Therapeutics, Inc. · 2014
- Split seal ring with interlocking cut35US 4,533,149 AJ. I. Case Company · 1985
- Split resin seal ring with chamfered end connection structures31US 5,934,680 ANtn Corporation · 1999