F25B 2700/03
Oil level
F25B2700/03 (Oil level) appears on 126 US grants and 126 published applications in this corpus.
Search patents in F25B- Granted patents
- 126
- Published applications
- 126
- Assignees
- 58
- Inventors
- 242
- Latest grant
- 18 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 4 | 0 |
| 2000 | 3 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 1 |
| 2003 | 2 | 2 |
| 2004 | 1 | 8 |
| 2005 | 2 | 5 |
| 2006 | 6 | 2 |
| 2007 | 3 | 3 |
| 2008 | 3 | 1 |
| 2009 | 3 | 3 |
| 2010 | 1 | 4 |
| 2011 | 3 | 3 |
| 2012 | 4 | 4 |
| 2013 | 1 | 2 |
| 2014 | 2 | 4 |
| 2015 | 3 | 7 |
| 2016 | 6 | 8 |
| 2017 | 7 | 5 |
| 2018 | 10 | 4 |
| 2019 | 5 | 11 |
| 2020 | 6 | 6 |
| 2021 | 7 | 9 |
| 2022 | 11 | 10 |
| 2023 | 8 | 8 |
| 2024 | 10 | 6 |
| 2025 | 5 | 5 |
| 2026 | 0 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Refrigeration apparatus with oil return control mechanism for compressors18 Nov 2025US 12,474,094 B2Panasonic Intellectual Property Management Co., Ltd.
- Oil management for dual compressor modulation9 Sep 2025US 12,410,954 B2Carrier Corporation
- Refrigeration apparatus10 Jun 2025US 12,326,280 B2Panasonic Intellectual Property Management Co., Ltd.
- Cooling system with oil return to accumulator1 Apr 2025US 12,264,858 B2Heatcraft Refrigeration Products LLC
- Refrigeration system with efficient expansion device control, liquid refrigerant return, oil return, and evaporator defrost28 Jan 2025US 12,209,779 B2Hill Phoenix, Inc.
- Oil distribution system for multiple-compressor systems20 Aug 2026US 2026/0243242 A1
- Refrigeration cycle apparatus25 Jun 2026US 2026/0177298 A1Mitsubishi Electric Corporation
- Suction pressure regulating valve and parallel compressor system18 Jun 2026US 2026/0169508 A1Danfoss (Tianjin) Ltd.
- Motor cooling system16 Apr 2026US 2026/0104185 A1Mazda Motor Corporation
- Method for managing oil in a multi-compressor refrigeration system and multi-compressor refrigeration system having a common oil equalization line provided with an oil pumping device29 Jan 2026US 2026/0029174 A1Danfoss Commercial Compressors
Most cited
By later US patents
- Refrigeration system and method of operating the same137US 6,973,794 B2Hussmann Corporation · 2005
- Oil level control system129US 6,125,642 ASporlan Valve Company · 2000
- Distributed intelligence control for commercial refrigeration95US 6,332,327 B1Hussmann Corporation · 2001
- Method and apparatus for measuring and improving efficiency in refrigeration systems95US 6,505,475 B1Hudson Technologies, Inc. · 2003
- Distributed intelligence control for commercial refrigeration90US 6,647,735 B2Hussmann Corporation · 2003