F04C 3/00
Rotary-piston machines or pumps, with non-parallel axes of movement of co-operating members
Official title: Rotary-piston machines or pumps, with non-parallel axes of movement of co-operating members, e.g. of screw type (with the working-chamber walls at least partly resiliently deformable F04C5/00; rotary-piston pumps with non-parallel axes of movement of co-operating members specially adapted for elastic fluids F04C18/48)
F04C3/00 (Rotary-piston machines or pumps, with non-parallel axes of movement of co-operating members) appears on 73 US grants and 64 published applications in this corpus.
Search patents in F04C- Granted patents
- 73
- Published applications
- 64
- Assignees
- 39
- Inventors
- 138
- Latest grant
- 4 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 3 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 3 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 1 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 2 |
| 2007 | 1 | 0 |
| 2008 | 1 | 2 |
| 2009 | 1 | 0 |
| 2010 | 1 | 3 |
| 2011 | 0 | 2 |
| 2012 | 2 | 2 |
| 2013 | 2 | 3 |
| 2014 | 2 | 3 |
| 2015 | 2 | 7 |
| 2016 | 2 | 1 |
| 2017 | 5 | 5 |
| 2018 | 2 | 1 |
| 2019 | 3 | 4 |
| 2020 | 4 | 9 |
| 2021 | 6 | 8 |
| 2022 | 8 | 2 |
| 2023 | 3 | 4 |
| 2024 | 6 | 2 |
| 2025 | 2 | 1 |
| 2026 | 1 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Spherical pump and motor assembly4 Aug 2026US 12,698,770 B2Shenzhen Spherical Fluid Power Technology Co., Ltd.
- Hand-operated pressurized-fluid device11 Nov 2025US 12,465,953 B2Kolektor Mobility D.O.O.
- Pump with high torque drive23 Sep 2025US 12,421,965 B2Graco Minnesota Inc.
- Rotary positive displacement device31 Dec 2024US 12,180,960 B2Spherical Rotors Inc.
- Oil-injected multi-stage compressor system and procedure for controlling such a compressor system25 Jun 2024US 12,018,678 B2Atlas Copco Airpower, Naamloze Vennootschap
- Spherical pump and motor assembly11 Jun 2026US 2026/0160248 A1Shenzhen Spherical Fluid Power Technology Co., Ltd.
- Screw compressor and refrigeration apparatus15 Jan 2026US 2026/0016006 A1Daikin Industries, Ltd.
- Water-cooling system with improved cooling efficiency and injection molding apparatus including same8 Jan 2026US 2026/0008216 A1Hyundai Motor Company
- Disperser pump17 Jul 2025US 2025/0229238 A1Obshchestvo S Ogranichennoi Otvetstvennostiu "Amatec"
- Rotary positive displacement device21 Nov 2024US 2024/0384720 A1Spherical Rotors Inc.
Most cited
By later US patents
- Hydraulic servo mechanism23US 4,194,437 A1980
- Fluid driven servomechanism13US 4,296,681 A1981
- Helical trochoidal rotary machines with offset10US 10,837,444 B2Rotoliptic Technologies Incorporated · 2020
- Sealing in helical trochoidal rotary machines10US 10,844,859 B2Rotoliptic Technologies Incorporated · 2020
- Rotary piston machine9US 7,275,920 B2Cor Pumps + Compressors AG · 2007