F04B 2201/0404
Lubricating oil condition
F04B2201/0404 (Lubricating oil condition) appears on 13 US grants and 13 published applications in this corpus.
Search patents in F04B- Granted patents
- 13
- Published applications
- 13
- Assignees
- 11
- Inventors
- 58
- Latest grant
- 16 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 1 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 1 | 0 |
| 2016 | 0 | 1 |
| 2017 | 0 | 1 |
| 2018 | 1 | 1 |
| 2019 | 1 | 0 |
| 2020 | 1 | 1 |
| 2021 | 2 | 2 |
| 2022 | 0 | 1 |
| 2023 | 0 | 1 |
| 2024 | 0 | 2 |
| 2025 | 2 | 0 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- System ADN method for monitoring the oil level of an oil-lubricated compressor16 Jun 2026US 12,655,833 B2Knorr-Bremse Systeme FüR Schienenfahrzeuge GmbH
- Liquid-cooled fracturing system23 Dec 2025US 12,503,935 B2Yantai Jereh Petroleum Equipment & Technologies Co., Ltd.
- Hydraulic fracturing pump health and performance monitoring using IoT sensor networks22 Jul 2025US 12,366,242 B2SPM Oil & Gas Inc.
- Monitoring lubricant in hydraulic fracturing pump system6 Apr 2021US 10,969,375 B1S,P.M. Flow Control, Inc.
- Refrigerant compressor9 Feb 2021US 10,914,301 B2BITZER Kuchlmaschinenbau GmbH
- Connection assembly and compressor30 Apr 2026US 2026/0117759 A1
- Method for monitoring the oil level of an oil-lubricated compressor, oil level monitoring system for carrying out the method and compressor system having such an oil level monitoring system20 Jun 2024US 2024/0200545 A1Knorr-Bremse Systeme FüR Schienenfahrzeuge GmbH
- Liquid-cooled fracturing system28 Mar 2024US 2024/0102359 A1Yantai Jereh Petroleum Equipment & Technologies Co., Ltd.
- Hydraulic fracturing pump health and performance monitoring using iot sensor networks9 Feb 2023US 2023/0044928 A1SPM Oil & Gas Inc.
- Piston compressor and method for operating a piston compressor29 Dec 2022US 2022/0412333 A1Hoerbiger Wien GmbH
Most cited
By later US patents
- Oil level control system129US 6,125,642 ASporlan Valve Company · 2000
- System and method for controlling screw compressors75US 6,017,192 A2000
- Modified compressor unit29US 4,698,983 A1987
- Method and apparatus for exchanging oil in a compressor12US 5,522,475 A1996
- Monitoring lubricant in hydraulic fracturing pump system8US 10,436,766 B1S,P.M. Flow Control, Inc. · 2019