F04C 18/088
Elements in the toothed wheels or the carter for relieving the pressure
Official title: {Elements in the toothed wheels or the carter for relieving the pressure of fluid imprisoned in the zones of engagement}
F04C18/088 (Elements in the toothed wheels or the carter for relieving the pressure) appears on 32 US grants and 31 published applications in this corpus.
Search patents in F04C- Granted patents
- 32
- Published applications
- 31
- Assignees
- 25
- Inventors
- 55
- Latest grant
- 4 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 1 | 1 |
| 2004 | 0 | 0 |
| 2005 | 1 | 4 |
| 2006 | 0 | 0 |
| 2007 | 1 | 2 |
| 2008 | 2 | 0 |
| 2009 | 0 | 2 |
| 2010 | 2 | 1 |
| 2011 | 0 | 0 |
| 2012 | 1 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 2 |
| 2016 | 1 | 2 |
| 2017 | 1 | 0 |
| 2018 | 2 | 2 |
| 2019 | 0 | 2 |
| 2020 | 1 | 1 |
| 2021 | 2 | 1 |
| 2022 | 0 | 1 |
| 2023 | 1 | 1 |
| 2024 | 4 | 4 |
| 2025 | 4 | 2 |
| 2026 | 0 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Complex screw rotors with a central circular cross section connecting right-hand and left-hand sections of the rotors4 Nov 2025US 12,460,640 B2Industrial Technologies and Services, LLC
- Slide valve for a twin-screw compressor30 Sep 2025US 12,429,053 B2Johnson Controls Air Conditioning and Refrigeration (Wuxi) Co., Ltd.
- Supercharger rotors for increased engine power output29 Jul 2025US 12,372,087 B2Brian Tooley Racing, Inc.
- Rotary compressor18 Feb 2025US 12,228,130 B2LG Electronics Inc.
- Complex screw rotors having multiple helical profiles joined by a centeral portion with a pocket8 Oct 2024US 12,110,888 B2Industrial Technologies and Services, LLC
- Scroll compressor16 Jul 2026US 2026/0201882 A1Hanon Systems
- Complex screw rotors28 May 2026US 2026/0146608 A1
- Supercharger rotors for increased engine power output20 Nov 2025US 2025/0354555 A1Brian Tooley Racing, Inc.
- Optimized energy recovery device14 Aug 2025US 2025/0257730 A1
- Complex screw rotors26 Dec 2024US 2024/0426298 A1Industrial Technologies and Services, LLC
Most cited
By later US patents
- Scroll compressor with bypass holes communicating with an intake chamber65US 7,344,365 B2Mitsubishi Heavy Industries, Ltd. · 2008
- Scroll air supply apparatus having a motor shaft and a mechanism shaft34US 6,887,051 B2Matsushita Electric Industrial Co., Ltd. · 2005
- Trapped volume vent means for meshing lobes of roots-type supercharger32US 5,131,829 AEaton Corporation · 1992
- Screw fluid machine and screw gear used in the same19US 5,674,063 ADiavac Limited · 1997
- Screw compressor17US 4,560,333 AHitachi, Ltd. · 1985