F04C 2/02
Rotary-piston machines or pumps: of arcuate-engagement type, i.e. with circular translatory movement
Official title: of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
F04C2/02 (Rotary-piston machines or pumps: of arcuate-engagement type, i.e. with circular translatory movement) appears on 191 US grants and 193 published applications in this corpus.
Search patents in F04C- Granted patents
- 191
- Published applications
- 193
- Assignees
- 103
- Inventors
- 415
- Latest grant
- 26 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 5 | 0 |
| 1986 | 3 | 0 |
| 1987 | 2 | 0 |
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 4 | 0 |
| 1999 | 1 | 0 |
| 2000 | 4 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 2 |
| 2004 | 1 | 1 |
| 2005 | 0 | 2 |
| 2006 | 0 | 1 |
| 2007 | 1 | 1 |
| 2008 | 1 | 2 |
| 2009 | 0 | 1 |
| 2010 | 2 | 3 |
| 2011 | 1 | 1 |
| 2012 | 1 | 1 |
| 2013 | 2 | 9 |
| 2014 | 2 | 13 |
| 2015 | 6 | 22 |
| 2016 | 13 | 11 |
| 2017 | 12 | 8 |
| 2018 | 7 | 7 |
| 2019 | 7 | 15 |
| 2020 | 7 | 12 |
| 2021 | 7 | 16 |
| 2022 | 21 | 21 |
| 2023 | 25 | 19 |
| 2024 | 18 | 14 |
| 2025 | 10 | 8 |
| 2026 | 8 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Hydrostatic radial piston unit26 May 2026US 12,638,057 B2Danfoss A/S
- Electric diaphragm pump with offset slider crank28 Apr 2026US 12,612,911 B2Ingersoll-Rand Industrial U.S., Inc.
- Scroll compressor31 Mar 2026US 12,590,583 B2Sanden Corporation
- Coating layer having a conforming material for a compressor and method of using the same17 Mar 2026US 12,577,950 B2Trane International Inc.
- Tensioning device for a scroll compressor17 Feb 2026US 12,553,435 B2Schwäbische Werkzeugmaschinen GmbH
- Scroll fluid machine with elastic member27 Aug 2026US 2026/0251140 A1Anest Iwata Corporation
- Scroll compressor and heat pump device7 May 2026US 2026/0126041 A1Robert Bosch GmbH
- Fluid pump changeable in diameter, in particular for medical application26 Mar 2026US 2026/0083958 A1Ecp Entwicklungsgesellschaft Mbh
- Scroll compressor20 Nov 2025US 2025/0354550 A1Sanden Corporation
- Radial piston pump16 Oct 2025US 2025/0320868 A1HAWE Hydraulik SE
Most cited
By later US patents
- Fluid pump changeable in diameter, in particular for medical application156US 8,944,748 B2Ecp Entwicklungsgesellschaft Mbh · 2015
- Micro-fluidic valve with a colloidal particle element83US 6,802,489 B2Colorado School of Mines · 2004
- Thrust bearing/coupling component for orbiting scroll-type machinery and scroll-type machinery incorporating the same66US 4,259,043 AArthur D. Little, Inc. · 1981
- Fluid pump changeable in diameter, in particular for medical application65US 11,278,711 B2Ecp Entwicklungsgesellschaft Mbh · 2022
- Compact scroll fluid device63US 5,800,140 AArthur D. Little, Inc. · 1998