F04B 39/045
Labyrinth-sealing between piston and cylinder
Official title: {Labyrinth-sealing between piston and cylinder}
F04B39/045 (Labyrinth-sealing between piston and cylinder) appears on 19 US grants and 14 published applications in this corpus.
Search patents in F04B- Granted patents
- 19
- Published applications
- 14
- Assignees
- 16
- Inventors
- 46
- Latest grant
- 14 Jan 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 2 |
| 2012 | 0 | 1 |
| 2013 | 0 | 0 |
| 2014 | 1 | 1 |
| 2015 | 0 | 0 |
| 2016 | 2 | 0 |
| 2017 | 0 | 2 |
| 2018 | 0 | 1 |
| 2019 | 0 | 0 |
| 2020 | 0 | 1 |
| 2021 | 1 | 4 |
| 2022 | 1 | 1 |
| 2023 | 1 | 1 |
| 2024 | 1 | 0 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Throttle ring14 Jan 2025US 12,196,316 B2Burckhardt Compression AG
- Compressor device and compression method24 Sep 2024US 12,098,711 B2Sera Corporation Inc.
- Rod packing8 Aug 2023US 11,719,344 B2Compressor Products International LLC
- Piston seal structure for injector6 Sep 2022US 11,434,889 B2Beijing Beifen-Ruili Analytical Instrument (Group) Co., Ltd.
- Seal assembly for reciprocating compressor5 Jan 2021US 10,883,483 B2Air Products and Chemicals, Inc.
- Throttle ring19 Oct 2023US 2023/0332688 A1Burckhardt Compression AG
- Rod packing21 Apr 2022US 2022/0120347 A1Compressor Products International LLC
- Labyrinth piston compressor30 Dec 2021US 2021/0404454 A1Burckhardt Compression AG
- High-pressure pump configuration24 Jun 2021US 2021/0190052 A1Microfluidics International Corporation
- Compressor Device and Compression Method3 Jun 2021US 2021/0164455 A1Sera Corporation Inc.
Most cited
By later US patents
- Fluid bearing with compliant linkage for centering reciprocating bodies84US 5,525,845 ASunPower Corporation · 1996
- Gas compressor with labyrinth sealing and active magnetic bearings37US 4,889,039 A1989
- Piston assembly for a compressor or the like34US 4,627,795 AAtlas Copco Aktiebolag of Nacka · 1986
- Device for guiding and centering a machine component26US 5,779,455 A1998
- Pistons20US 4,048,975 AF. B. J. Engineering Services Pty. Limited · 1977