F04D 25/08
The working fluid being air
Official title: the working fluid being air, e.g. for ventilation
F04D25/08 (The working fluid being air) appears on 3,524 US grants and 4,081 published applications in this corpus.
Search patents in F04D- Granted patents
- 3,524
- Published applications
- 4,081
- Assignees
- 1,306
- Inventors
- 6,518
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 11 | 0 |
| 1977 | 6 | 0 |
| 1978 | 10 | 0 |
| 1979 | 3 | 0 |
| 1980 | 8 | 0 |
| 1981 | 2 | 0 |
| 1982 | 5 | 0 |
| 1983 | 5 | 0 |
| 1984 | 10 | 0 |
| 1985 | 13 | 0 |
| 1986 | 4 | 0 |
| 1987 | 7 | 0 |
| 1988 | 13 | 0 |
| 1989 | 18 | 0 |
| 1990 | 17 | 0 |
| 1991 | 16 | 0 |
| 1992 | 18 | 0 |
| 1993 | 24 | 0 |
| 1994 | 21 | 0 |
| 1995 | 32 | 0 |
| 1996 | 31 | 0 |
| 1997 | 24 | 0 |
| 1998 | 28 | 0 |
| 1999 | 45 | 0 |
| 2000 | 73 | 0 |
| 2001 | 73 | 17 |
| 2002 | 73 | 45 |
| 2003 | 51 | 56 |
| 2004 | 64 | 78 |
| 2005 | 43 | 71 |
| 2006 | 61 | 109 |
| 2007 | 46 | 93 |
| 2008 | 32 | 112 |
| 2009 | 34 | 96 |
| 2010 | 51 | 111 |
| 2011 | 59 | 101 |
| 2012 | 75 | 126 |
| 2013 | 71 | 148 |
| 2014 | 103 | 117 |
| 2015 | 100 | 168 |
| 2016 | 88 | 196 |
| 2017 | 129 | 187 |
| 2018 | 151 | 240 |
| 2019 | 202 | 299 |
| 2020 | 222 | 244 |
| 2021 | 192 | 271 |
| 2022 | 254 | 223 |
| 2023 | 262 | 263 |
| 2024 | 273 | 241 |
| 2025 | 237 | 239 |
| 2026 | 134 | 230 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Fan6 Oct 2026US 12,753,768 B2Levitronix LLC
- Ceiling fan with a quick connect assembly6 Oct 2026US 12,753,775 B2Hunter Fan Company
- Inflating module for use with an inflatable object6 Oct 2026US RE51,054 E1Team Worldwide Corporation
- Portable fan with hanging portion and adjustment bracket29 Sep 2026US 12,747,733 B1Shenzhen Zhile Interconnection Technology Co., Ltd.
- Blowing device and blowing device operating method29 Sep 2026US 12,747,738 B2Samsung Electronics Co., Ltd.
- Evaporator for ambient water bodies, and related system and method8 Oct 2026US 2026/0306964 A1Resource West, Inc.
- Spring plunger ceiling fan blade installation system1 Oct 2026US 2026/0298259 A1Hkc-US, LLC
- Air blowing apparatus with auxiliary fan housing and auxiliary baffle24 Sep 2026US 2026/0286974 A1MTD Products Inc
- Fan assembly24 Sep 2026US 2026/0286976 A1Milwaukee Electric Tool Corporation
- Fan lamp24 Sep 2026US 2026/0287169 A1Opple Lighting Co., Ltd.
Most cited
By later US patents
- Compact low noise efficient blower for CPAP devices351US 7,866,944 B2ResMed Motor Technologies Inc. · 2011
- Blower with bearing tube333US 8,636,479 B2ResMed Motor Technologies Inc. · 2014
- Air control system for air bed275US 4,890,344 A1990
- Air control system for an air bed273US 5,509,154 ASelect Comfort Corporation · 1996
- Air control system for an air bed273US 6,037,723 ASelect Comfort Corporation · 2000