F04C 2220/40
Pumps with means for venting areas other than the working chamber
Official title: Pumps with means for venting areas other than the working chamber, e.g. bearings, gear chambers, shaft seals
F04C2220/40 (Pumps with means for venting areas other than the working chamber) appears on 26 US grants and 17 published applications in this corpus.
Search patents in F04C- Granted patents
- 26
- Published applications
- 17
- Assignees
- 20
- Inventors
- 49
- Latest grant
- 11 Mar 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 3 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 1 | 0 |
| 2004 | 1 | 1 |
| 2005 | 0 | 1 |
| 2006 | 1 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 3 |
| 2009 | 0 | 1 |
| 2010 | 2 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 2 |
| 2014 | 0 | 1 |
| 2015 | 2 | 1 |
| 2016 | 0 | 0 |
| 2017 | 2 | 1 |
| 2018 | 0 | 0 |
| 2019 | 0 | 2 |
| 2020 | 1 | 0 |
| 2021 | 0 | 1 |
| 2022 | 1 | 0 |
| 2023 | 1 | 1 |
| 2024 | 1 | 0 |
| 2025 | 1 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Scroll compressor with direct return of oil from an oil separator into a compression portion11 Mar 2025US 12,247,567 B2Sanden International (Europe) GmbH
- Pump system29 Oct 2024US 12,129,849 B2
- Pin vent assembly26 Dec 2023US 11,852,152 B2The Gorman-Rupp Company
- Screw compressor for a utility vehicle14 Jun 2022US 11,359,630 B2KNORR-BREMSE Systeme fuer Nutzfahrzeuge GmbH
- Flushable device for measuring flow processes of fluids10 Mar 2020US 10,584,704 B2AVL List GmbH
- Scroll compressor with direct return of oil from an oil separator into a compression portion30 Jan 2025US 2025/0035114 A1Sanden International (Europe) GmbH
- Pump System16 Mar 2023US 2023/0080102 A1
- Pin Vent Assembly8 Apr 2021US 2021/0102544 A1Tuthill Corporation
- Screw Compressor for a Utility Vehicle26 Dec 2019US 2019/0390673 A1KNORR-BREMSE Systeme fuer Nutzfahrzeuge GmbH
- Flushable device for measuring flow processes of fluids16 May 2019US 2019/0145408 A1AVL List GmbH
Most cited
By later US patents
- Vented compressor lubrication system47US 5,176,506 ACopeland Corporation · 1993
- Screw compressor with integral oil cooling36US 4,780,061 AAmerican Standard Inc. · 1988
- Lubrication of refrigerant compressor bearings24US 5,469,713 ASKF USA Inc. · 1995
- Gas actuated slide valve in a screw compressor23US 5,509,273 AAmerican Standard Inc. · 1996
- Scroll compressor lubrication control17US 5,306,126 ATecumseh Products Company · 1994