F04C 29/028
Means for improving or restricting lubricant flow
Official title: {Means for improving or restricting lubricant flow}
F04C29/028 (Means for improving or restricting lubricant flow) appears on 452 US grants and 459 published applications in this corpus.
Search patents in F04C- Granted patents
- 452
- Published applications
- 459
- Assignees
- 157
- Inventors
- 1,051
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 3 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 4 | 0 |
| 1994 | 6 | 0 |
| 1995 | 1 | 0 |
| 1996 | 3 | 0 |
| 1997 | 2 | 0 |
| 1998 | 5 | 0 |
| 1999 | 1 | 0 |
| 2000 | 8 | 0 |
| 2001 | 12 | 2 |
| 2002 | 8 | 6 |
| 2003 | 3 | 6 |
| 2004 | 6 | 15 |
| 2005 | 2 | 12 |
| 2006 | 10 | 19 |
| 2007 | 11 | 8 |
| 2008 | 12 | 14 |
| 2009 | 13 | 11 |
| 2010 | 11 | 27 |
| 2011 | 8 | 8 |
| 2012 | 9 | 13 |
| 2013 | 13 | 19 |
| 2014 | 14 | 23 |
| 2015 | 15 | 22 |
| 2016 | 23 | 15 |
| 2017 | 16 | 12 |
| 2018 | 15 | 29 |
| 2019 | 17 | 23 |
| 2020 | 26 | 37 |
| 2021 | 21 | 24 |
| 2022 | 45 | 32 |
| 2023 | 28 | 30 |
| 2024 | 43 | 18 |
| 2025 | 19 | 15 |
| 2026 | 12 | 19 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Supercharger22 Sep 2026US 12,742,412 B2Eaton Intelligent Power Limited
- Variable-speed refrigerating scroll compressor with an oil flow regulating device28 Jul 2026US 12,692,864 B2Danfoss Commercial Compressors
- Vacuum pump with oil drip shutoff2 Jun 2026US 12,644,453 B2
- Scroll compression mechanism and scroll compressor19 May 2026US 12,631,182 B2Copeland Climate Technologies (Suzhou) Co. Ltd.
- Scavenge loss limiter for a rotary compressor12 May 2026US 12,624,696 B2Ingersoll-Rand Industrial U.S., Inc.
- Oil storage device for compressor and compressor having the same24 Sep 2026US 2026/0286962 A1BITZER Refrigeration Technology (China) Co., Ltd.
- Pump body assembly, compressor and air conditioner17 Sep 2026US 2026/0275987 A1Gree Electric Appliances, Inc. of Zhuhai
- Shaft utilization for back pressure control and oil distribution20 Aug 2026US 2026/0243259 A1Hanon Systems
- Scroll compressor20 Aug 2026US 2026/0243260 A1LG Electronics Inc.
- Oil conduit system for hvac&r system13 Aug 2026US 2026/0235335 A1Tyco Fire & Security GmbH
Most cited
By later US patents
- Scroll compressor73US 5,660,539 AHitachi, Ltd. · 1997
- Scroll compressor having a frame and open sleeve for controlling gas and lubricant flow65US 5,533,875 AAmerican Standard Inc. · 1996
- Scroll compressor bearing lubrication54US 6,082,495 ACopeland Corporation · 2000
- Scroll fluid machine having oil-supply holes being formed through a reinforcement bearing plate on a rear surface of the orbiting scroll53US 7,404,706 B2Anest Iwata Corporation · 2008
- Counterweight shield for refrigeration compressor52US 5,064,356 ACopeland Corporation · 1991