F04C 2/04
Of internal axis type
Official title: of internal axis type
F04C2/04 (Of internal axis type) appears on 37 US grants and 34 published applications in this corpus.
Search patents in F04C- Granted patents
- 37
- Published applications
- 34
- Assignees
- 25
- Inventors
- 73
- Latest grant
- 26 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 1 |
| 2008 | 1 | 0 |
| 2009 | 0 | 1 |
| 2010 | 2 | 2 |
| 2011 | 0 | 0 |
| 2012 | 1 | 0 |
| 2013 | 1 | 4 |
| 2014 | 1 | 4 |
| 2015 | 3 | 4 |
| 2016 | 3 | 1 |
| 2017 | 3 | 1 |
| 2018 | 0 | 0 |
| 2019 | 1 | 3 |
| 2020 | 0 | 2 |
| 2021 | 1 | 1 |
| 2022 | 3 | 1 |
| 2023 | 4 | 4 |
| 2024 | 1 | 3 |
| 2025 | 1 | 1 |
| 2026 | 2 | 0 |
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
- Hydrostatic radial piston unit13 Jan 2026US 12,523,201 B2Danfoss A/S
- Scroll compressor with circular surface terminations11 Feb 2025US 12,221,962 B2
- Compressor modulation system with multi-way valve23 Jan 2024US 11,879,460 B2Copeland Corporation
- Motor-integrated fluid machine21 Nov 2023US 11,821,428 B2Hitachi Industrial Equipment Systems Co., Ltd.
- Radial piston pump16 Oct 2025US 2025/0320868 A1HAWE Hydraulik SE
- Hydrostatic radial piston unit21 Mar 2024US 2024/0093666 A1Danfoss A/S
- Hydrostatic radial piston unit8 Feb 2024US 2024/0044319 A1Danfoss A/S
- Scroll compressor with circular surface terminations8 Feb 2024US 2024/0044334 A1
- Motor-Integrated Fluid Machine15 Jun 2023US 2023/0184252 A1Hitachi Industrial Equipment Systems Co., Ltd.
Most cited
By later US patents
- Variable capacity vane pump with dual control chambers23US 7,794,217 B2MAGNA Powertrain AG & Co KG · 2010
- Rotary positive displacement machine for incompressible media11US 5,011,386 AGutag Innovations AG · 1991
- Variable capacity vane pump with dual control chambers9US 8,317,486 B2MAGNA Powertrain AG & Co KG · 2012
- Fluid pump with eccentrically driven C-shaped pumping member8US 4,606,711 ANippon Soken, Inc. · 1986
- Variable displacement variable pressure vane pump system8US 8,444,395 B2MAGNA Powertrain AG & Co KG · 2013