F04C 2/22
Rotary-piston machines or pumps: of internal-axis type with equidirectional movement of co-operating
Official title: of internal-axis type with equidirectional movement of co-operating members at the points of engagement, or with one of the co-operating members being stationary, the inner member having more teeth or tooth-equivalents than the outer member
F04C2/22 (Rotary-piston machines or pumps: of internal-axis type with equidirectional movement of co-operating) appears on 43 US grants and 43 published applications in this corpus.
Search patents in F04C- Granted patents
- 43
- Published applications
- 43
- Assignees
- 34
- Inventors
- 85
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 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 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 3 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 1 | 0 |
| 2011 | 0 | 1 |
| 2012 | 1 | 1 |
| 2013 | 0 | 0 |
| 2014 | 0 | 2 |
| 2015 | 2 | 1 |
| 2016 | 0 | 5 |
| 2017 | 3 | 3 |
| 2018 | 2 | 2 |
| 2019 | 3 | 2 |
| 2020 | 4 | 5 |
| 2021 | 1 | 8 |
| 2022 | 3 | 3 |
| 2023 | 5 | 2 |
| 2024 | 5 | 3 |
| 2025 | 3 | 1 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Rotary pump with telescoping rotor sections that vary the flow rate18 Aug 2026US 12,710,040 B1Pratt & Whitney Canada Corp.
- Dual gerotor apparatus, a powertrain assembley and an electrified vehicle27 May 2025US 12,313,067 B2Valeo Powertrain (Nanjing) Co., Ltd.
- Variable displacement gerotor pump18 Feb 2025US 12,228,132 B2
- Pump with a deformable diaphragm21 Jan 2025US 12,203,474 B2PSG Germany GmbH
- Fluid transfer apparatus3 Dec 2024US 12,158,149 B2Korea Atomic Energy Research Institute
- Modular trochoidal medicament pump device and driving device13 Aug 2026US 2026/0232894 A1
- Pumps15 May 2025US 2025/0154953 A1PSG Germany GmbH
- Sealing In Helical Trochoidal Rotary Machines22 Aug 2024US 2024/0280099 A1Rotoliptic Technologies Incorporated
- Pumps22 Aug 2024US 2024/0280100 A1Quantex Patents Limited
- A dual gerotor apparatus, a powertrain assembley and an electrified vehicle11 Jan 2024US 2024/0011483 A1Valeo Powertrain (Nanjing) Co., Ltd.
Most cited
By later US patents
- Pump with conveying chamber formed in outer rotor surface55US 7,674,100 B2PDD Innovations Ltd. · 2010
- Pump for liquid and gaseous fluids, especially blood49US 4,551,073 A1985
- Artifical heart41US 4,296,500 AAgence Nationale de Valorisation de la Recherche (ANVAR) · 1981
- Rotary pump for blood and other sensitive liquids17US 4,594,060 A1986
- Quiet vacuum cleaner using a vacuum pump with a lobed chamber11US 6,014,791 ASoundesign Corporation · 2000