F16N 7/40
In a closed circulation system
Official title: in a closed circulation system
F16N7/40 (In a closed circulation system) appears on 193 US grants and 167 published applications in this corpus.
Search patents in F16N- Granted patents
- 193
- Published applications
- 167
- Assignees
- 140
- Inventors
- 429
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 2 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 5 | 0 |
| 1988 | 6 | 0 |
| 1989 | 1 | 0 |
| 1990 | 7 | 0 |
| 1991 | 2 | 0 |
| 1992 | 4 | 0 |
| 1993 | 6 | 0 |
| 1994 | 6 | 0 |
| 1995 | 4 | 0 |
| 1996 | 3 | 0 |
| 1997 | 6 | 0 |
| 1998 | 5 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 3 | 0 |
| 2003 | 0 | 1 |
| 2004 | 1 | 0 |
| 2005 | 0 | 4 |
| 2006 | 1 | 3 |
| 2007 | 2 | 0 |
| 2008 | 2 | 1 |
| 2009 | 0 | 3 |
| 2010 | 1 | 3 |
| 2011 | 2 | 6 |
| 2012 | 5 | 8 |
| 2013 | 2 | 6 |
| 2014 | 7 | 8 |
| 2015 | 4 | 4 |
| 2016 | 4 | 16 |
| 2017 | 6 | 7 |
| 2018 | 7 | 7 |
| 2019 | 10 | 19 |
| 2020 | 11 | 15 |
| 2021 | 13 | 13 |
| 2022 | 15 | 5 |
| 2023 | 7 | 12 |
| 2024 | 9 | 12 |
| 2025 | 10 | 9 |
| 2026 | 6 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Circulation sump device for an electric drive unit of a vehicle22 Sep 2026US 12,744,431 B2Bayerische Motoren Werke Aktiengesellschaft
- Arrangement and method for sealing a propeller shaft of a marine vessel18 Aug 2026US 12,709,372 B2ABB AB
- Lubrication system7 Jul 2026US 12,674,545 B2Honda Motor Co., Ltd.
- Lubricant recovery system for heat exchange system and heat exchange system31 Mar 2026US 12,590,741 B2Carrier Corporation
- Gearbox arrangement providing partial vacuum within a gearbox device as well as method of efficiently providing and maintaining partial vacuum and use27 Jan 2026US 12,535,130 B2Flender-Graffenstaden S.A.S.
- An oil recovery system17 Sep 2026US 2026/0276146 A1Corsaer Holding B.V.
- Lubricant system for aircraft6 Aug 2026US 2026/0227029 A1Pratt & Whitney Canada Corp.
- Oil and gas operations with valve operably coupled to wellhead7 May 2026US 2026/0125965 A1Downing Wellhead Equipment, LLC
- Drivetrain of wind turbine with lubrication system and wind turbine comprising lubrication system30 Apr 2026US 2026/0117749 A1Envision Energy CO.,LTD
- Gyrostabiliser with active precession control and energy recuperation system16 Apr 2026US 2026/0103268 A1Veem Ltd.
Most cited
By later US patents
- High-low pressure lubrication system for high-horsepower plunger pump139US 10,859,203 B1American Jereh International Corporation · 2020
- Lubrication and cooling system for a powertrain including an electric motor73US 5,217,085 AFord Motor Company · 1993
- Oil system for gas turbine engine54US 4,891,934 AGeneral Motors Corporation · 1990
- Method and apparatus for regulating a compressor lubrication system53US 5,318,151 AIngersoll-Rand Company · 1994
- Lubricating system for gas turbine engines52US 4,511,016 AMTU Motoren- und Turbinen-Union Muenchen GmbH · 1985