F04C 18/084
Toothed wheels
Official title: {Toothed wheels}
F04C18/084 (Toothed wheels) appears on 240 US grants and 210 published applications in this corpus.
Search patents in F04C- Granted patents
- 240
- Published applications
- 210
- Assignees
- 116
- Inventors
- 441
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 4 | 0 |
| 1985 | 1 | 0 |
| 1986 | 4 | 0 |
| 1987 | 6 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 3 | 0 |
| 1991 | 4 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 5 | 0 |
| 1995 | 3 | 0 |
| 1996 | 2 | 0 |
| 1997 | 7 | 0 |
| 1998 | 5 | 0 |
| 1999 | 3 | 0 |
| 2000 | 5 | 0 |
| 2001 | 9 | 4 |
| 2002 | 9 | 5 |
| 2003 | 7 | 9 |
| 2004 | 5 | 9 |
| 2005 | 7 | 12 |
| 2006 | 7 | 5 |
| 2007 | 3 | 7 |
| 2008 | 3 | 10 |
| 2009 | 11 | 4 |
| 2010 | 5 | 10 |
| 2011 | 3 | 4 |
| 2012 | 3 | 7 |
| 2013 | 5 | 5 |
| 2014 | 8 | 7 |
| 2015 | 5 | 11 |
| 2016 | 4 | 7 |
| 2017 | 6 | 7 |
| 2018 | 8 | 6 |
| 2019 | 8 | 18 |
| 2020 | 1 | 8 |
| 2021 | 8 | 10 |
| 2022 | 6 | 7 |
| 2023 | 11 | 9 |
| 2024 | 22 | 17 |
| 2025 | 13 | 7 |
| 2026 | 1 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Vacuum pump assembly with improved process by-product holding capacity1 Sep 2026US 12,723,588 B2Beijing Grand Hitek. Co., Ltd.
- Screw compressor and refrigeration apparatus25 Nov 2025US 12,480,492 B2Daikin Industries, Ltd.
- 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
- Low coefficient of expansion rotors for blowers21 Oct 2025US 12,448,968 B2Industrial Technologies and Services, LLC
- Screw compressor and refrigeration apparatus7 Oct 2025US 12,435,719 B2Daikin Industries, Ltd.
- Air Compressor30 Jul 2026US 2026/0218705 A1Hitachi Industrial Equipment Systems Co., Ltd.
- Complex screw rotors28 May 2026US 2026/0146608 A1
- Screw Fluid Machine29 Jan 2026US 2026/0028987 A1Hitachi Industrial Equipment Systems Co., Ltd.
- Multi-stage hook and claw compressor assembly15 Jan 2026US 2026/0016011 A1
- Vacuum Pump Assembly with Improved Process By-product Holding Capacity15 Jan 2026US 2026/0016012 A1Beijing Grand Hitek. Co., Ltd.
Most cited
By later US patents
- Hair treatment method56US 6,916,316 B22005
- Evacuating apparatus40US 5,709,537 AMatsushita Electric Industrial Co., Ltd. · 1998
- Hair treatment method28US 7,553,308 B22009
- Package-type screw compressor25US 5,613,843 AHitachi, Ltd. · 1997
- Oil-free screw compressor and method of manufacture24US 5,364,250 AHitachi, Ltd. · 1994