F04D 29/28
For centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
Official title: for centrifugal or helico-centrifugal pumps {for radial-flow or helico-centrifugal pumps}
F04D29/28 (For centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps) appears on 2,585 US grants and 3,106 published applications in this corpus.
Search patents in F04D- Granted patents
- 2,585
- Published applications
- 3,106
- Assignees
- 1,008
- Inventors
- 5,415
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 10 | 0 |
| 1977 | 8 | 0 |
| 1978 | 9 | 0 |
| 1979 | 10 | 0 |
| 1980 | 14 | 0 |
| 1981 | 6 | 0 |
| 1982 | 7 | 0 |
| 1983 | 4 | 0 |
| 1984 | 7 | 0 |
| 1985 | 9 | 0 |
| 1986 | 4 | 0 |
| 1987 | 10 | 0 |
| 1988 | 6 | 0 |
| 1989 | 10 | 0 |
| 1990 | 10 | 0 |
| 1991 | 14 | 0 |
| 1992 | 16 | 0 |
| 1993 | 12 | 0 |
| 1994 | 7 | 0 |
| 1995 | 13 | 0 |
| 1996 | 14 | 0 |
| 1997 | 23 | 0 |
| 1998 | 24 | 0 |
| 1999 | 21 | 0 |
| 2000 | 30 | 0 |
| 2001 | 28 | 4 |
| 2002 | 31 | 40 |
| 2003 | 41 | 42 |
| 2004 | 34 | 45 |
| 2005 | 28 | 62 |
| 2006 | 39 | 66 |
| 2007 | 32 | 63 |
| 2008 | 27 | 53 |
| 2009 | 25 | 76 |
| 2010 | 28 | 61 |
| 2011 | 38 | 58 |
| 2012 | 55 | 85 |
| 2013 | 30 | 86 |
| 2014 | 51 | 97 |
| 2015 | 70 | 185 |
| 2016 | 72 | 245 |
| 2017 | 105 | 282 |
| 2018 | 188 | 224 |
| 2019 | 245 | 222 |
| 2020 | 229 | 185 |
| 2021 | 183 | 193 |
| 2022 | 190 | 166 |
| 2023 | 150 | 156 |
| 2024 | 164 | 165 |
| 2025 | 138 | 122 |
| 2026 | 66 | 123 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Impeller and centrifugal compressor6 Oct 2026US 12,753,772 B2Mitsubishi Heavy Industries Compressor Corporation
- Motor rotor with inner sleeve15 Sep 2026US 12,738,785 B2
- Turbo compressor8 Sep 2026US 12,729,691 B2LG Electronics Inc.
- Air purification device capable of discharging air bidirectionally1 Sep 2026US 12,722,108 B1Hiso Inc
- Method for machining ribs or grooves for air or gas bearings of a rotary-shaft-comprising workpiece of a compressor, and method for assembling the components of the workpiece1 Sep 2026US 12,723,595 B2The Swatch Group Research and Development Ltd
- Impeller with converging inducer8 Oct 2026US 2026/0309161 A1Pratt & Whitney Canada Corp.
- Rotor for a turbomachine, turbomachine, and method for balancing a rotor of a turbomachine1 Oct 2026US 2026/0298094 A1Accelleron Switzerland Ltd.
- Centrifugal impeller and centrifugal pump1 Oct 2026US 2026/0298256 A1Shinmaywa Industries, Ltd.
- Turbine wheel for a radial turbine1 Oct 2026US 2026/0298257 A1Daimler Truck AG
- Multi-blade centrifugal air-sending device1 Oct 2026US 2026/0298258 A1Mitsubishi Electric Corporation
Most cited
By later US patents
- Compact low noise efficient blower for CPAP devices351US 7,866,944 B2ResMed Motor Technologies Inc. · 2011
- Dual-pressure blower for positive air pressure device333US 6,349,724 B1Compumedics Sleep Pty Ltd · 2002
- Medical ventilator268US 6,543,449 B1Respironics, Inc. · 2003
- Portable drag compressor powered mechanical ventilator220US 5,868,133 ABird Products Corporation · 1999
- Robotic vacuum cleaner206US 7,079,923 B2F Robotics Acquisitions Ltd. · 2006