F25B 31/004
Oil recirculating arrangements
Official title: {oil recirculating arrangements}
F25B31/004 (Oil recirculating arrangements) appears on 548 US grants and 582 published applications in this corpus.
Search patents in F25B- Granted patents
- 548
- Published applications
- 582
- Assignees
- 191
- Inventors
- 1,236
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 3 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 7 | 0 |
| 1986 | 4 | 0 |
| 1987 | 6 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 3 | 0 |
| 1991 | 3 | 0 |
| 1992 | 7 | 0 |
| 1993 | 2 | 0 |
| 1994 | 4 | 0 |
| 1995 | 7 | 0 |
| 1996 | 5 | 0 |
| 1997 | 4 | 0 |
| 1998 | 6 | 0 |
| 1999 | 9 | 0 |
| 2000 | 9 | 0 |
| 2001 | 11 | 0 |
| 2002 | 11 | 11 |
| 2003 | 16 | 10 |
| 2004 | 8 | 11 |
| 2005 | 5 | 23 |
| 2006 | 16 | 12 |
| 2007 | 7 | 6 |
| 2008 | 3 | 12 |
| 2009 | 4 | 15 |
| 2010 | 6 | 23 |
| 2011 | 6 | 14 |
| 2012 | 12 | 14 |
| 2013 | 8 | 25 |
| 2014 | 11 | 16 |
| 2015 | 15 | 34 |
| 2016 | 18 | 30 |
| 2017 | 28 | 35 |
| 2018 | 26 | 28 |
| 2019 | 39 | 31 |
| 2020 | 33 | 51 |
| 2021 | 32 | 45 |
| 2022 | 42 | 39 |
| 2023 | 29 | 30 |
| 2024 | 32 | 21 |
| 2025 | 26 | 29 |
| 2026 | 17 | 17 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Autocascade system with superheat control6 Oct 2026US 12,753,960 B2Trane International Inc.
- Operation control system, operation control apparatus, and operation control method25 Aug 2026US 12,716,601 B2Daikin Industries, Ltd.
- CO2 refrigeration system with convertible compressors25 Aug 2026US 12,716,621 B2Hill Phoenix, Inc.
- Lubrication system for a compressor18 Aug 2026US 12,710,203 B2Johnson Controls Industries SAS
- Refrigeration system with oil control system28 Jul 2026US 12,693,048 B2Hill Phoenix, Inc.
- Lubricant pump system for hvac&r system8 Oct 2026US 2026/0309136 A1Tyco Fire & Security GmbH
- Oil distribution system for multiple-compressor systems20 Aug 2026US 2026/0243242 A1
- Outdoor unit for air conditioning and air conditioner20 Aug 2026US 2026/0243449 A1Carrier Japan Corporation
- Oil conduit system for hvac&r system13 Aug 2026US 2026/0235335 A1Tyco Fire & Security GmbH
- Refrigerant compressor13 Aug 2026US 2026/0235336 A1Secop GmbH
Most cited
By later US patents
- Method and apparatus for measuring and improving efficiency in refrigeration systems95US 6,505,475 B1Hudson Technologies, Inc. · 2003
- Air conditioner77US 5,369,958 AMitsubishi Denki Kabushiki Kaisha · 1994
- Refrigeration system having periodic flush cycles68US 4,697,431 A1987
- Air conditioning apparatus and control method thereof62US 6,735,965 B2Samsung Electronics Co., Ltd. · 2004
- Capacity controllable compressor apparatus56US 5,094,598 AHitachi, Ltd. · 1992