F04D 29/681
Especially adapted for elastic fluid pumps
Official title: {especially adapted for elastic fluid pumps}
F04D29/681 (Especially adapted for elastic fluid pumps) appears on 958 US grants and 1,009 published applications in this corpus.
Search patents in F04D- Granted patents
- 958
- Published applications
- 1,009
- Assignees
- 354
- Inventors
- 1,926
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 2 | 0 |
| 1978 | 5 | 0 |
| 1979 | 5 | 0 |
| 1980 | 3 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 3 | 0 |
| 1985 | 2 | 0 |
| 1986 | 4 | 0 |
| 1987 | 4 | 0 |
| 1988 | 3 | 0 |
| 1989 | 5 | 0 |
| 1990 | 3 | 0 |
| 1991 | 4 | 0 |
| 1992 | 4 | 0 |
| 1993 | 6 | 0 |
| 1994 | 9 | 0 |
| 1995 | 11 | 0 |
| 1996 | 5 | 0 |
| 1997 | 4 | 0 |
| 1998 | 5 | 0 |
| 1999 | 10 | 0 |
| 2000 | 10 | 0 |
| 2001 | 13 | 2 |
| 2002 | 14 | 16 |
| 2003 | 18 | 14 |
| 2004 | 11 | 16 |
| 2005 | 15 | 26 |
| 2006 | 12 | 18 |
| 2007 | 13 | 29 |
| 2008 | 10 | 32 |
| 2009 | 15 | 39 |
| 2010 | 12 | 46 |
| 2011 | 19 | 44 |
| 2012 | 52 | 38 |
| 2013 | 31 | 39 |
| 2014 | 29 | 52 |
| 2015 | 34 | 57 |
| 2016 | 28 | 65 |
| 2017 | 54 | 58 |
| 2018 | 54 | 65 |
| 2019 | 72 | 61 |
| 2020 | 66 | 70 |
| 2021 | 66 | 46 |
| 2022 | 69 | 42 |
| 2023 | 42 | 45 |
| 2024 | 44 | 34 |
| 2025 | 38 | 27 |
| 2026 | 14 | 28 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Compressor shroud with swept grooves22 Sep 2026US 12,742,459 B2Pratt & Whitney Canada Corp.
- Flow grid and ambient air purification device4 Aug 2026US 12,697,572 B2MANN+HUMMEL Life Sciences & Environment Holding Singapore Pte. Ltd.
- Centrifugal compressor with liquid injection23 Jun 2026US 12,663,023 B2Daikin Industries, Ltd.
- Fan casing or liner with interchangeable tip treatment segments26 May 2026US 12,638,024 B2Rolls-Royce North American Technologies Inc.
- Compressor cooling system for a turbofan engine19 May 2026US 12,631,125 B1Pratt & Whitney Canada Corp.
- Fan casing or liner with interchangeable tip treatment segments3 Sep 2026US 2026/0258814 A1Rolls-Royce North American Technologies Inc.
- Centrifugal compressor and turbocharger13 Aug 2026US 2026/0235140 A1Mitsubishi Heavy Industries Engine & Turbocharger, Ltd.
- Blower6 Aug 2026US 2026/0226913 A1Carrier Japan Corporation
- Ported shroud centrifugal compressor6 Aug 2026US 2026/0226917 A1Ohio State Innovation Foundation
- Aeronautical thruster23 Jul 2026US 2026/0208853 A1Centre National de la Recherche Scientifique (CNRS)
Most cited
By later US patents
- Reduction of turbomachinery noise149US 6,004,095 AMassachusetts Institute of Technology · 1999
- Fan shroud with integral air supply124US 5,881,685 ABoard of Trustees operating Michigan State University · 1999
- Fan124US 8,092,166 B2Dyson Technology Limited · 2012
- Cooling fan shroud121US 5,762,034 ABoard of Trustees operating Michigan State University · 1998
- Rotary turbomachine having a transonic compressor stage98US 6,017,186 AMTU Motoren- und Turbinen-Union Muenchen GmbH · 2000