F15B 21/045
Compensating for variations in viscosity or temperature
F15B21/045 (Compensating for variations in viscosity or temperature) appears on 120 US grants and 86 published applications in this corpus.
Search patents in F15B- Granted patents
- 120
- Published applications
- 86
- Assignees
- 74
- Inventors
- 254
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 2 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 3 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 3 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 4 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 3 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 4 | 0 |
| 2002 | 4 | 3 |
| 2003 | 4 | 3 |
| 2004 | 2 | 5 |
| 2005 | 1 | 1 |
| 2006 | 3 | 3 |
| 2007 | 3 | 1 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 2 | 1 |
| 2011 | 0 | 0 |
| 2012 | 1 | 2 |
| 2013 | 1 | 0 |
| 2014 | 1 | 0 |
| 2015 | 2 | 4 |
| 2016 | 2 | 2 |
| 2017 | 3 | 4 |
| 2018 | 2 | 8 |
| 2019 | 6 | 4 |
| 2020 | 7 | 4 |
| 2021 | 8 | 9 |
| 2022 | 4 | 6 |
| 2023 | 7 | 8 |
| 2024 | 5 | 4 |
| 2025 | 5 | 11 |
| 2026 | 8 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Temperature regulation system for vehicle hydraulic system25 Aug 2026US 12,716,434 B2Oshkosh Corporation
- Electro-hydraulic actuator with a pilot-actuated float mode16 Jun 2026US 12,655,918 B2Parker-Hannifin Corporation
- Working vehicle19 May 2026US 12,631,001 B2Takeuchi Mfg. Co., Ltd.
- Working machine and control method therefor31 Mar 2026US 12,590,596 B2Kubota Corporation
- Hydraulic circuit control device and molding machine17 Mar 2026US 12,577,963 B2Aisin Corporation
- Working machine26 Mar 2026US 2026/0085495 A1Kubota Corporation
- Energy Storage and Control System for Pipeline Flow Control12 Feb 2026US 2026/0043422 A1
- Working machine and control method therefor2 Oct 2025US 2025/0305523 A1Kubota Corporation
- Hydraulic pressure control unit14 Aug 2025US 2025/0256692 A1Robert Bosch GmbH
- Hydraulic circuit control device and molding machine14 Aug 2025US 2025/0257794 A1Aisin Corporation
Most cited
By later US patents
- Hydraulic control device47US 5,259,293 AHeilmeier & Weinlein Fabrik fuer Oel-Hydraulik GmbH & Co. KG · 1993
- Control apparatus and method for automatically controlling a hydraulic system for heavy construction equipment45US 5,251,440 ASamsung Heavy Industries Co., Ltd. · 1993
- Hydraulic fan drive system39US 4,179,888 AEaton Corporation · 1979
- Control valve32US 4,336,903 ARobert Bosch GmbH · 1982
- Hydraulic fan drive system including variable displacement pump31US 4,446,697 AEaton Corporation · 1984