F04C 2270/24
Level of liquid
Official title: Level of liquid, e.g. lubricant or cooling liquid
F04C2270/24 (Level of liquid) appears on 57 US grants and 64 published applications in this corpus.
Search patents in F04C- Granted patents
- 57
- Published applications
- 64
- Assignees
- 36
- Inventors
- 166
- Latest grant
- 16 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 1 |
| 2004 | 1 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 1 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 2 |
| 2012 | 0 | 1 |
| 2013 | 1 | 3 |
| 2014 | 2 | 8 |
| 2015 | 0 | 1 |
| 2016 | 4 | 5 |
| 2017 | 5 | 3 |
| 2018 | 5 | 4 |
| 2019 | 3 | 7 |
| 2020 | 4 | 4 |
| 2021 | 4 | 5 |
| 2022 | 2 | 5 |
| 2023 | 7 | 5 |
| 2024 | 8 | 3 |
| 2025 | 3 | 2 |
| 2026 | 2 | 3 |
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
- Refrigerant compressor including an oil level sensor arrangement26 May 2026US 12,638,324 B2Danfoss Commercial Compressors
- Compressor-oil receiving device and compressor system having a compressor-oil receiving device of this type8 Jul 2025US 12,352,269 B2Knorr-Bremse Systeme FüR Schienenfahrzeuge GmbH
- Methods and systems for lubricating a transport climate control system having an auxiliary sump27 May 2025US 12,313,066 B2Thermo King Corporation
- Multi-compressor system with normally-open valves in oil balancing connections4 Mar 2025US 12,241,670 B2Danfoss Commercial Compressors
- Compressor with multiple lubricant sumps2 Jul 2026US 2026/0185526 A1Thermo King Corporation
- Connection assembly and compressor30 Apr 2026US 2026/0117759 A1
- Control device, refrigeration system, control method, and control program29 Jan 2026US 2026/0029182 A1Daikin Industries, Ltd.
- Motor and pump system with fluid level control plate6 Nov 2025US 2025/0341212 A1
- Compressor-oil receiving device and compressor system having a compressor-oil receiving device of this type1 May 2025US 2025/0137456 A1Knorr-Bremse Systeme FüR Schienenfahrzeuge GmbH
Most cited
By later US patents
- Oil level control system129US 6,125,642 ASporlan Valve Company · 2000
- Scroll compressor52US 6,017,205 ACopeland Corporation · 2000
- Oil equalization system for parallel connected compressors46US 4,383,802 ADunham-Bush, Inc. · 1983
- Process for monitoring the coolant level in a cooling system25US 5,239,865 AMercedes-Benz AG · 1993
- System including high-side and low-side compressors11US 9,360,011 B2Emerson Climate Technologies, Inc. · 2016