F15B 21/005
Filling or draining of fluid systems
Official title: {Filling or draining of fluid systems}
F15B21/005 (Filling or draining of fluid systems) appears on 116 US grants and 151 published applications in this corpus.
Search patents in F15B- Granted patents
- 116
- Published applications
- 151
- Assignees
- 100
- Inventors
- 328
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 0 |
| 2003 | 1 | 1 |
| 2004 | 2 | 5 |
| 2005 | 4 | 4 |
| 2006 | 5 | 1 |
| 2007 | 1 | 5 |
| 2008 | 2 | 3 |
| 2009 | 1 | 1 |
| 2010 | 1 | 0 |
| 2011 | 0 | 2 |
| 2012 | 1 | 1 |
| 2013 | 0 | 2 |
| 2014 | 1 | 8 |
| 2015 | 2 | 8 |
| 2016 | 3 | 4 |
| 2017 | 11 | 13 |
| 2018 | 5 | 7 |
| 2019 | 7 | 10 |
| 2020 | 11 | 10 |
| 2021 | 8 | 9 |
| 2022 | 8 | 10 |
| 2023 | 4 | 10 |
| 2024 | 9 | 12 |
| 2025 | 11 | 11 |
| 2026 | 10 | 14 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- System for returning fluid from hydraulic devices of work machines6 Oct 2026US 12,753,579 B2Caterpillar Inc.
- System and method for de-icing a communication tower8 Sep 2026US 12,730,415 B2SMR Technologies, Inc.
- System, method, apparatus, device and kit for containing oil during a hydraulic purge1 Sep 2026US 12,723,606 B2
- Controlling rate of rotor feather by system secondary to primary blade angle control system14 Jul 2026US 12,679,527 B2Pratt & Whitney Canada Corp.
- Regulator having check valve manifold for use in subsea control circuit9 Jun 2026US 12,650,052 B2National Coupling Company, Inc.
- Methods for operating a vehicle comfort system, and vehicle comfort system16 Jul 2026US 2026/0200384 A1Faurecia Autositze GmbH
- Mounting and adjustment device for an adjustment element of an aircraft, in particular for a control surface, wing tip or door of an aircraft16 Jul 2026US 2026/0201911 A1Liebherr-Aerospace Lindenberg GmbH
- Hydraulic drive system25 Jun 2026US 2026/0177083 A1Hamm AG
- Hydraulic System having a Conditioning Circuit25 Jun 2026US 2026/0177085 A1Robert Bosch GmbH
- Hydraulic System having an Inertia Charging Arrangement25 Jun 2026US 2026/0177086 A1Robert Bosch GmbH
Most cited
By later US patents
- Multiple line hydraulic system flush valve and method of use28US 6,315,049 B1Baker Hughes Incorporated · 2001
- Methods and systems for performing, monitoring and analyzing multiple machine fluid processes26US 7,793,681 B2Rpm Industries, LLC · 2010
- Methods and systems for performing, monitoring and analyzing multiple machine fluid processes24US 7,150,286 B2Rpm Industries, LLC · 2006
- Apparatus for flushing, replacing fluid and bleeding hydraulic systems22US 6,796,339 B1Phoenix Systems, L.L.C. · 2004
- Hydraulic attachment17US 9,574,962 B2Construction Tools GmbH · 2017