F04C 18/20
With dissimilar tooth forms
Official title: with dissimilar tooth forms (F04C18/16 takes precedence)
F04C18/20 (With dissimilar tooth forms) appears on 20 US grants and 21 published applications in this corpus.
Search patents in F04C- Granted patents
- 20
- Published applications
- 21
- Assignees
- 13
- Inventors
- 32
- Latest grant
- 4 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 0 |
| 2012 | 1 | 1 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 1 |
| 2016 | 1 | 0 |
| 2017 | 1 | 2 |
| 2018 | 0 | 3 |
| 2019 | 2 | 2 |
| 2020 | 1 | 2 |
| 2021 | 2 | 2 |
| 2022 | 2 | 2 |
| 2023 | 2 | 1 |
| 2024 | 3 | 3 |
| 2025 | 3 | 0 |
| 2026 | 0 | 1 |
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
- Rotor pair for a compression block of a screw machine8 Jul 2025US 12,352,266 B2Kaeser Kompressoren SE
- Rotor assembly, compressor and air conditioner7 Jan 2025US 12,188,472 B2Gree Electric Appliances, Inc. of Zhuhai
- 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
- Complex screw rotors having multiple helical profiles joined by a centeral portion with a pocket3 Sep 2024US 12,078,169 B2Industrial Technologies and Services, LLC
- Complex screw rotors28 May 2026US 2026/0146608 A1
- Complex screw rotors26 Dec 2024US 2024/0426298 A1Industrial Technologies and Services, LLC
- Rotor pair for a compression block of a screw machine30 May 2024US 2024/0175436 A1Kaeser Kompressoren SE
- Rotor Assembly, Compressor and Air Conditioner4 Apr 2024US 2024/0110565 A1Gree Electric Appliances, Inc. of Zhuhai
- Complex screw rotors31 Aug 2023US 2023/0272797 A1Industrial Technologies and Services, LLC
Most cited
By later US patents
- Rotary compressor16US 4,457,680 A1984
- External axis rotary piston compressor11US 4,464,102 AWankel GmbH · 1984
- Screw compressor with oil shutoff and method4US 10,288,070 B2Carrier Corporation · 2019
- Rotor profile for a screw compressor2US 8,246,333 B2Kyungwon Machinery Co., Ltd. · 2012
- Rotor pair for a compression block of a screw machine1US 10,400,769 B2Kaeser Kompressoren SE · 2019