F04D 33/00
Non-positive-displacement pumps with other than pure rotation
Official title: Non-positive-displacement pumps with other than pure rotation, e.g. of oscillating type (F04D35/00 takes precedence; hand-held fans A45B)
F04D33/00 (Non-positive-displacement pumps with other than pure rotation) appears on 228 US grants and 262 published applications in this corpus.
Search patents in F04D- Granted patents
- 228
- Published applications
- 262
- Assignees
- 132
- Inventors
- 501
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 3 | 0 |
| 1987 | 1 | 0 |
| 1988 | 4 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 3 | 0 |
| 2000 | 2 | 0 |
| 2001 | 4 | 0 |
| 2002 | 2 | 4 |
| 2003 | 5 | 0 |
| 2004 | 2 | 7 |
| 2005 | 1 | 7 |
| 2006 | 8 | 7 |
| 2007 | 3 | 10 |
| 2008 | 10 | 8 |
| 2009 | 6 | 19 |
| 2010 | 5 | 22 |
| 2011 | 7 | 10 |
| 2012 | 8 | 4 |
| 2013 | 8 | 13 |
| 2014 | 5 | 19 |
| 2015 | 9 | 17 |
| 2016 | 10 | 18 |
| 2017 | 17 | 18 |
| 2018 | 11 | 10 |
| 2019 | 14 | 8 |
| 2020 | 10 | 14 |
| 2021 | 6 | 11 |
| 2022 | 14 | 9 |
| 2023 | 14 | 12 |
| 2024 | 11 | 5 |
| 2025 | 3 | 2 |
| 2026 | 5 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Piezoelectric MEMS-based active cooling for heat dissipation in compute devices22 Sep 2026US 12,745,638 B2Frore Systems Inc.
- Driving of piezoelectrics for MEMS-based cooling systems19 May 2026US 12,635,413 B2Frore Systems Inc.
- Gas propulsion thrust device5 May 2026US 12,618,418 B1
- Fluid control device7 Apr 2026US 12,595,790 B2Murata Manufacturing Co., Ltd.
- Exit channel configuration for MEMS-based actuator systems17 Mar 2026US 12,581,620 B2Frore Systems Inc.
- Driving Circuit and Air-Pulse Generating System with Asymmetric Initial Deflection16 Jul 2026US 2026/0205740 A1xMEMS Labs, Inc.
- Air-Pulse Generating Device with Asymmetric Initial Deflection16 Jul 2026US 2026/0205741 A1xMEMS Labs, Inc.
- Airflow Generating Device with Differential Modulation Driving and Asymmetric Initial Deflection2 Jul 2026US 2026/0185633 A1xMEMS Labs, Inc.
- 4d printed fan with optimized cooling25 Jun 2026US 2026/0177073 A1International Business Machines Corporation
- Driving mechanism14 May 2026US 2026/0136488 A1TDK Taiwan Corp.
Most cited
By later US patents
- Electroactive polymer devices for moving fluid149US 7,064,472 B2SRI International · 2006
- LED light with active cooling136US 7,204,615 B2Lumination LLC · 2007
- Electrokinetic transducing methods and apparatus and systems comprising or utilizing the same130US 4,789,801 AZenion Industries, Inc. · 1988
- System and method for thermal management by synthetic jet ejector channel cooling techniques126US 6,588,497 B1Georgia Tech Research Corporation · 2003
- Piezoelectric fan101US 4,780,062 AMurata Manufacturing Co., Ltd. · 1988