F15B 21/044
Removal or measurement of undissolved gas
Official title: Removal or measurement of undissolved gas, e.g. de-aeration, venting or bleeding
F15B21/044 (Removal or measurement of undissolved gas) appears on 215 US grants and 190 published applications in this corpus.
Search patents in F15B- Granted patents
- 215
- Published applications
- 190
- Assignees
- 152
- Inventors
- 503
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 4 | 0 |
| 1984 | 0 | 0 |
| 1985 | 3 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 4 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 3 | 0 |
| 1995 | 4 | 0 |
| 1996 | 2 | 0 |
| 1997 | 3 | 0 |
| 1998 | 4 | 0 |
| 1999 | 3 | 0 |
| 2000 | 3 | 0 |
| 2001 | 6 | 0 |
| 2002 | 6 | 3 |
| 2003 | 4 | 6 |
| 2004 | 2 | 5 |
| 2005 | 5 | 3 |
| 2006 | 3 | 6 |
| 2007 | 3 | 2 |
| 2008 | 1 | 3 |
| 2009 | 1 | 7 |
| 2010 | 3 | 5 |
| 2011 | 3 | 5 |
| 2012 | 4 | 4 |
| 2013 | 3 | 8 |
| 2014 | 6 | 15 |
| 2015 | 9 | 8 |
| 2016 | 3 | 7 |
| 2017 | 9 | 12 |
| 2018 | 7 | 15 |
| 2019 | 14 | 16 |
| 2020 | 17 | 12 |
| 2021 | 13 | 10 |
| 2022 | 12 | 11 |
| 2023 | 6 | 7 |
| 2024 | 7 | 7 |
| 2025 | 14 | 8 |
| 2026 | 6 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- System, method, apparatus, device and kit for containing oil during a hydraulic purge1 Sep 2026US 12,723,606 B2
- System and method for deaeration7 Jul 2026US 12,673,275 B2Donaldson Company, Inc.
- Control valve and working machine including control valve12 May 2026US 12,624,530 B2Kubota Corporation
- Tank breather cap with integrated filter, splash protection, and nipple for breather hose24 Mar 2026US 12,583,653 B2Advanced Suspension Technology LLC
- Hydraulic device with case drain system17 Mar 2026US 12,577,971 B2Tonand Inc.
- System and method for deaeration1 Oct 2026US 2026/0295469 A1Donaldson Company, Inc.
- Apparatus6 Aug 2026US 2026/0226924 A1Hydac Technology GmbH
- Hydraulic system for working machine, working machine, and method of controlling working machine26 Mar 2026US 2026/0085496 A1Kubota Corporation
- Fitting for through-wall penetration of a composite vessel26 Mar 2026US 2026/0085752 A1Parker-Hannifin Corporation
- System, method, apparatus, device and kit for containing oil during a hydraulic purge29 Jan 2026US 2026/0029004 A1
Most cited
By later US patents
- Bleed valve for bleeding fluid from a hydraulic circuit105US 5,853,071 AMcDonnell Douglas Corporation · 1998
- Hydraulic circuit for synchronized horizontal extension of cylinders86US 7,926,410 B2JR Automation Technologies, LLC · 2011
- Hydraulic tensioner50US 6,383,103 B1Tsubakimoto Chain Co. · 2002
- Method and apparatus for eliminating cavitation in hydraulic systems40US 4,696,684 A1987
- Hydraulic reservoir32US 4,529,512 AClark Equipment Company · 1985