F15B 21/041
Removal or measurement of solid or liquid contamination
Official title: Removal or measurement of solid or liquid contamination, e.g. filtering
F15B21/041 (Removal or measurement of solid or liquid contamination) appears on 256 US grants and 288 published applications in this corpus.
Search patents in F15B- Granted patents
- 256
- Published applications
- 288
- Assignees
- 194
- Inventors
- 630
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 3 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 6 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 2 |
| 2002 | 3 | 7 |
| 2003 | 8 | 4 |
| 2004 | 4 | 11 |
| 2005 | 7 | 11 |
| 2006 | 6 | 5 |
| 2007 | 3 | 7 |
| 2008 | 5 | 3 |
| 2009 | 3 | 3 |
| 2010 | 3 | 5 |
| 2011 | 2 | 9 |
| 2012 | 6 | 7 |
| 2013 | 6 | 8 |
| 2014 | 10 | 9 |
| 2015 | 3 | 8 |
| 2016 | 8 | 11 |
| 2017 | 10 | 18 |
| 2018 | 11 | 22 |
| 2019 | 16 | 20 |
| 2020 | 24 | 21 |
| 2021 | 20 | 18 |
| 2022 | 17 | 16 |
| 2023 | 13 | 8 |
| 2024 | 9 | 17 |
| 2025 | 15 | 21 |
| 2026 | 14 | 17 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Foreign object recognition system6 Oct 2026US 12,755,537 B2Komatsu Ltd.
- Small displacement hydraulic actuator22 Sep 2026US 12,742,464 B2Zhejiang Kc Mechanical & Electrical Co., Ltd.
- Method of operating a compressed air system, computer program, computer-readable medium, control arrangement, compressed air system, and vehicle25 Aug 2026US 12,715,414 B2Scania CV AB
- Hydraulic system having a conditioning circuit4 Aug 2026US 12,698,788 B2Robert Bosch GmbH
- Hybrid filter element apparatus7 Jul 2026US 12,673,280 B2
- Actuator unit, system and operating method8 Oct 2026US 2026/0309170 A1Knorr-Bremse Systeme fur Nutzfahrzeuge GmbH
- Mechanism for online continuous purification of hydraulic and/or lubricating oil using available system pressure24 Sep 2026US 2026/0286991 A1
- Pneumatic automation device, maintenance assembly, pneumatic system, and method17 Sep 2026US 2026/0276012 A1Festo AG & Co.
- Fluid property monitoring system, method for detecting abnormality in detected value from fluid property sensor, and program20 Aug 2026US 2026/0243718 A1KYB Corporation
- Systems for detection of bypass valve actuation using pressure data13 Aug 2026US 2026/0233130 A1Donaldson Company, Inc.
Most cited
By later US patents
- Compressed air control apparatus63US 5,600,953 AAisin Seiki Kabushiki Kaisha · 1997
- Oil filter for the cleaning of lubricating oil34US 5,516,425 AMahle GmbH · 1996
- Hydraulic machine, system for monitoring health of hydraulic machine, and method thereof31US 7,082,758 B2Komatsu Ltd. · 2006
- Multiple line hydraulic system flush valve and method of use28US 6,315,049 B1Baker Hughes Incorporated · 2001
- Hydraulic fluid filter device28US 6,605,210 B2FSP-Holding AG · 2003