F04B 39/04
Measures to avoid lubricant contaminating the pumped fluid
F04B39/04 (Measures to avoid lubricant contaminating the pumped fluid) appears on 279 US grants and 224 published applications in this corpus.
Search patents in F04B- Granted patents
- 279
- Published applications
- 224
- Assignees
- 183
- Inventors
- 667
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 4 | 0 |
| 1982 | 1 | 0 |
| 1983 | 3 | 0 |
| 1984 | 6 | 0 |
| 1985 | 4 | 0 |
| 1986 | 4 | 0 |
| 1987 | 6 | 0 |
| 1988 | 6 | 0 |
| 1989 | 6 | 0 |
| 1990 | 6 | 0 |
| 1991 | 6 | 0 |
| 1992 | 4 | 0 |
| 1993 | 10 | 0 |
| 1994 | 1 | 0 |
| 1995 | 3 | 0 |
| 1996 | 8 | 0 |
| 1997 | 3 | 0 |
| 1998 | 7 | 0 |
| 1999 | 8 | 0 |
| 2000 | 3 | 0 |
| 2001 | 10 | 1 |
| 2002 | 5 | 3 |
| 2003 | 5 | 4 |
| 2004 | 2 | 3 |
| 2005 | 1 | 2 |
| 2006 | 2 | 2 |
| 2007 | 1 | 2 |
| 2008 | 2 | 2 |
| 2009 | 0 | 4 |
| 2010 | 1 | 2 |
| 2011 | 0 | 4 |
| 2012 | 2 | 9 |
| 2013 | 3 | 13 |
| 2014 | 7 | 5 |
| 2015 | 4 | 17 |
| 2016 | 10 | 7 |
| 2017 | 10 | 20 |
| 2018 | 12 | 14 |
| 2019 | 8 | 5 |
| 2020 | 14 | 16 |
| 2021 | 8 | 19 |
| 2022 | 9 | 15 |
| 2023 | 9 | 11 |
| 2024 | 12 | 20 |
| 2025 | 24 | 14 |
| 2026 | 11 | 10 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Reciprocating pump seal devices, and associated systems and methods22 Sep 2026US 12,742,446 B2Patriot Acquisitions, LLC
- Wiper ring for reciprocating compressor rod packing7 Jul 2026US 12,674,444 B2Compressor Products International LLC (Cpi)
- Piston for a compressor, compressor, and method and removal tool for disassembling a piston2 Jun 2026US 12,644,447 B2Burckhardt Compression AG
- Long-life non-contact pump12 May 2026US 12,624,690 B2
- Sealing gas leakage recovery and sealing gas boosting system and method28 Apr 2026US 12,612,922 B2Nuovo Pignone Tecnologie Srl
- Reciprocating pump seal devices, and associated systems and methods27 Aug 2026US 2026/0251133 A1Patriot Acquisitions, LLC
- Hydrogen production apparatus for a wind turbine, wind turbine arrangement and method for operating a hydrogen production apparatus for a wind turbine2 Jul 2026US 2026/0185252 A1Siemens Gamesa Renewable Energy A/S
- High performance sealing assembly18 Jun 2026US 2026/0168490 A1Vulcan Industrial Holdings, LLC
- Hydraulic end of fracturing pump4 Jun 2026US 2026/0153082 A1Yantai Jereh Oilfield Services Group Co., Ltd.
- Hydraulic end of fracturing pump4 Jun 2026US 2026/0153083 A1Yantai Jereh Oilfield Services Group Co., Ltd.
Most cited
By later US patents
- Link mechanism of surgical robot270US 6,827,351 B2Nuovo Pignone Holding S.p.A. · 2004
- Diaphragm pump with at least two diaphragms104US 5,554,014 AKNF Neuberger GmbH · 1996
- Fluid bearing with compliant linkage for centering reciprocating bodies84US 5,525,845 ASunPower Corporation · 1996
- Suction accumulator76US 6,220,050 B1Tecumseh Products Company · 2001
- Packing for piston and valve machine71US 5,145,340 ADowell Schlumberger Incorporated · 1992