F04B 39/02
Lubrication
Official title: Lubrication (of machines or engines in general F01M)
F04B39/02 (Lubrication) appears on 733 US grants and 764 published applications in this corpus.
Search patents in F04B- Granted patents
- 733
- Published applications
- 764
- Assignees
- 297
- Inventors
- 1,651
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 7 | 0 |
| 1978 | 5 | 0 |
| 1979 | 7 | 0 |
| 1980 | 4 | 0 |
| 1981 | 1 | 0 |
| 1982 | 3 | 0 |
| 1983 | 5 | 0 |
| 1984 | 4 | 0 |
| 1985 | 7 | 0 |
| 1986 | 5 | 0 |
| 1987 | 4 | 0 |
| 1988 | 14 | 0 |
| 1989 | 3 | 0 |
| 1990 | 6 | 0 |
| 1991 | 6 | 0 |
| 1992 | 7 | 0 |
| 1993 | 13 | 0 |
| 1994 | 9 | 0 |
| 1995 | 10 | 0 |
| 1996 | 7 | 0 |
| 1997 | 8 | 0 |
| 1998 | 12 | 0 |
| 1999 | 13 | 0 |
| 2000 | 17 | 0 |
| 2001 | 16 | 2 |
| 2002 | 17 | 14 |
| 2003 | 11 | 9 |
| 2004 | 11 | 17 |
| 2005 | 9 | 25 |
| 2006 | 11 | 31 |
| 2007 | 9 | 13 |
| 2008 | 10 | 14 |
| 2009 | 8 | 27 |
| 2010 | 8 | 35 |
| 2011 | 11 | 20 |
| 2012 | 12 | 24 |
| 2013 | 12 | 24 |
| 2014 | 25 | 30 |
| 2015 | 13 | 50 |
| 2016 | 28 | 32 |
| 2017 | 30 | 53 |
| 2018 | 29 | 42 |
| 2019 | 36 | 45 |
| 2020 | 43 | 61 |
| 2021 | 41 | 45 |
| 2022 | 47 | 39 |
| 2023 | 33 | 35 |
| 2024 | 40 | 25 |
| 2025 | 31 | 26 |
| 2026 | 15 | 26 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Air compressor29 Sep 2026US 12,747,730 B2Hitachi Industrial Equipment Systems Co., Ltd.
- Refrigerant compressor15 Sep 2026US 12,736,041 B2Secop GmbH
- Dry-sump reciprocating piston compressor with lubricant circuit1 Sep 2026US 12,723,579 B2Officine Mario Dorin S.P.A.
- Compressor18 Aug 2026US 12,710,034 B2Samsung Electronics Co., Ltd.
- Oil injected air compressor and method for controlling the same, and storage medium and electronic device4 Aug 2026US 12,699,409 B2Fusheng Industrial (Shanghai) Co., Ltd
- Oil distribution system for multiple-compressor systems20 Aug 2026US 2026/0243242 A1
- Hermetic compressor and refrigerator including the same13 Aug 2026US 2026/0235334 A1Samsung Electronics Co., Ltd.
- Refrigerant compressor13 Aug 2026US 2026/0235336 A1Secop GmbH
- Refrigeration apparatus30 Jul 2026US 2026/0218948 A1Daikin Industries, Ltd.
- Reciprocating compressor25 Jun 2026US 2026/0177045 A1LG Electronics Inc.
Most cited
By later US patents
- Duplex compressor oil sump131US 4,505,650 ACarrier Corporation · 1985
- Combination sight glass and sump oil level sensor for a hermetic compressor102US 6,276,901 B1Tecumseh Products Company · 2001
- Energy conversion system using windmill91US 4,055,950 A1977
- Compressor lubricating oil heater control89US 4,066,869 ACarrier Corporation · 1978
- Compressor control system and method82US 6,082,971 AIngersoll-Rand Company · 2000