F04C 18/18
With similar tooth forms
Official title: with similar tooth forms (F04C18/16 takes precedence)
F04C18/18 (With similar tooth forms) appears on 34 US grants and 39 published applications in this corpus.
Search patents in F04C- Granted patents
- 34
- Published applications
- 39
- Assignees
- 27
- Inventors
- 62
- Latest grant
- 29 Jul 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1987 | 1 | 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 | 1 |
| 2005 | 1 | 1 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 1 | 3 |
| 2010 | 0 | 0 |
| 2011 | 1 | 1 |
| 2012 | 1 | 1 |
| 2013 | 1 | 0 |
| 2014 | 1 | 3 |
| 2015 | 1 | 6 |
| 2016 | 1 | 4 |
| 2017 | 5 | 3 |
| 2018 | 3 | 4 |
| 2019 | 2 | 3 |
| 2020 | 2 | 1 |
| 2021 | 1 | 1 |
| 2022 | 4 | 1 |
| 2023 | 1 | 2 |
| 2024 | 3 | 1 |
| 2025 | 4 | 2 |
By publication year. Applications have been published since 2001.
Recent patents
- Supercharger rotors for increased engine power output29 Jul 2025US 12,372,087 B2Brian Tooley Racing, Inc.
- Gear pump with suction housing element providing a tight seal between suction and high-pressure chamber to increase pump efficiency and method of providing tight seal27 May 2025US 12,313,071 B1Hamilton Sundstrand Corporation
- Parallel connected multiple shaft roots vacuum pump13 May 2025US 12,297,831 B1China Link Consultant Company, Ltd.
- Compressor formed by identical rotors with circular arcs25 Feb 2025US 12,234,822 B1
- Redundant pumping system and pumping method by means of this pumping system31 Dec 2024US 12,180,953 B2Ateliers Busch SA
- Supercharger rotors for increased engine power output20 Nov 2025US 2025/0354555 A1Brian Tooley Racing, Inc.
- Parallel connected multiple shaft roots vacuum pump8 May 2025US 2025/0146490 A1China Link Consultant Company, Ltd.
- Supercharger rotors for increased engine power output27 Jun 2024US 2024/0209856 A1Brian Tooley Racing, Inc.
- Pump System16 Mar 2023US 2023/0080102 A1
- Redundant pumping system and pumping method by means of this pumping system5 Jan 2023US 2023/0003208 A1Ateliers Busch SA
Most cited
By later US patents
- Optimized helix angle rotors for Roots-style supercharger24US 7,488,164 B2Eaton Corporation · 2009
- Optimized helix angle rotors for Roots-style supercharger21US 7,866,966 B2Eaton Corporation · 2011
- Tool locking mechanism16US 6,868,760 B1Pratt-Read Corporation · 2005
- Optimized helix angle rotors for roots-style supercharger11US 8,632,324 B2Eaton Corporation · 2014
- Fluid pump apparatus7US 4,710,110 A1987