F16J 15/3484
Tandem seals
Official title: {Tandem seals}
F16J15/3484 (Tandem seals) appears on 152 US grants and 156 published applications in this corpus.
Search patents in F16J- Granted patents
- 152
- Published applications
- 156
- Assignees
- 89
- Inventors
- 313
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 2 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 9 | 0 |
| 2000 | 2 | 0 |
| 2001 | 3 | 0 |
| 2002 | 3 | 3 |
| 2003 | 3 | 7 |
| 2004 | 3 | 5 |
| 2005 | 1 | 7 |
| 2006 | 5 | 3 |
| 2007 | 2 | 2 |
| 2008 | 2 | 4 |
| 2009 | 0 | 8 |
| 2010 | 5 | 8 |
| 2011 | 3 | 10 |
| 2012 | 7 | 7 |
| 2013 | 3 | 5 |
| 2014 | 8 | 7 |
| 2015 | 7 | 6 |
| 2016 | 3 | 3 |
| 2017 | 5 | 9 |
| 2018 | 2 | 5 |
| 2019 | 8 | 8 |
| 2020 | 4 | 7 |
| 2021 | 6 | 10 |
| 2022 | 5 | 12 |
| 2023 | 17 | 5 |
| 2024 | 8 | 1 |
| 2025 | 6 | 8 |
| 2026 | 2 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Tandem seal pump8 Sep 2026US 12,729,692 B2Ceco Environmental IP Inc.
- High pressure gas sealing23 Jun 2026US 12,663,015 B2Dover Pumps & Process Solutions Segment, Inc.
- Mechanical seal arrangement18 Nov 2025US 12,473,979 B2Eagleburgmann Germany GmbH & Co.KG
- Seal arrangement28 Oct 2025US 12,455,010 B2Schaeffler Technologies AG & Co. KG
- Mechanical seal device7 Oct 2025US 12,435,792 B2Pillar Corporation
- Sealing arrangement, pump and method13 Aug 2026US 2026/0235137 A1Aalto University Foundation sr
- Sealing ring assembly for sealing a rotating shaft on extraction equipment16 Jul 2026US 2026/0201954 A1
- Sealing assembly and vertical pump/mixer comprising the sealing assembly18 Jun 2026US 2026/0166503 A1Sulzer Management AG
- Seal and system with a seal12 Mar 2026US 2026/0071680 A1Stasskol GmbH
- Sealing Structure5 Mar 2026US 2026/0063206 A1Zhejiang Sanou Machinery Co. Ltd.
Most cited
By later US patents
- Emission seal77US 5,865,441 A1999
- Tandem seal arrangement for mechanical face seals62US 5,529,315 AJohn Crane Inc. · 1996
- Gas lubricated slow speed seal57US 6,142,478 AJohn Crane Inc. · 2000
- Seal assembly for an intershaft seal in a gas turbine engine53US 6,196,790 B1United Technologies Corporation · 2001
- Gas face seal49US 5,066,026 AKaydon Corporation · 1991