F04D 29/545
Ducts
Official title: {Ducts}
F04D29/545 (Ducts) appears on 650 US grants and 706 published applications in this corpus.
Search patents in F04D- Granted patents
- 650
- Published applications
- 706
- Assignees
- 315
- Inventors
- 1,441
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 5 | 0 |
| 1980 | 6 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 3 | 0 |
| 1985 | 4 | 0 |
| 1986 | 4 | 0 |
| 1987 | 4 | 0 |
| 1988 | 4 | 0 |
| 1989 | 3 | 0 |
| 1990 | 3 | 0 |
| 1991 | 3 | 0 |
| 1992 | 2 | 0 |
| 1993 | 8 | 0 |
| 1994 | 3 | 0 |
| 1995 | 6 | 0 |
| 1996 | 7 | 0 |
| 1997 | 6 | 0 |
| 1998 | 3 | 0 |
| 1999 | 2 | 0 |
| 2000 | 3 | 0 |
| 2001 | 7 | 1 |
| 2002 | 17 | 10 |
| 2003 | 9 | 7 |
| 2004 | 8 | 13 |
| 2005 | 8 | 16 |
| 2006 | 10 | 21 |
| 2007 | 7 | 18 |
| 2008 | 15 | 17 |
| 2009 | 8 | 5 |
| 2010 | 9 | 8 |
| 2011 | 4 | 16 |
| 2012 | 8 | 15 |
| 2013 | 6 | 25 |
| 2014 | 11 | 20 |
| 2015 | 14 | 33 |
| 2016 | 15 | 44 |
| 2017 | 32 | 49 |
| 2018 | 44 | 63 |
| 2019 | 52 | 55 |
| 2020 | 58 | 47 |
| 2021 | 40 | 41 |
| 2022 | 44 | 42 |
| 2023 | 42 | 41 |
| 2024 | 48 | 27 |
| 2025 | 31 | 39 |
| 2026 | 16 | 33 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Handheld blower15 Sep 2026US 12,733,600 B2Milwaukee Electric Tool Corporation
- Air guide ring and axial flow fan comprising same8 Sep 2026US 12,729,697 B2Tyco Fire & Security GmbH
- Comfort fan providing continuous radial air flow11 Aug 2026US 12,704,131 B2Whiskey Lima Corporation
- Air guide ring and axial flow fan comprising same7 Jul 2026US 12,674,470 B2Tyco Fire & Security GmbH
- Compressor bleed air exhaust ducting for gas turbine engine systems23 Jun 2026US 12,663,021 B1Rolls-Royce North American Technologies Inc.
- Blower24 Sep 2026US 2026/0286981 A1
- Fan assembly10 Sep 2026US 2026/0266302 A1Dyson Technology Limited
- High-speed booster fan module and portable fan3 Sep 2026US 2026/0258815 A1Guangdong Aoyun Technology Co., Ltd.
- Inline duct fan, control system, and method of controlling the same20 Aug 2026US 2026/0243274 A1Research Products Corporation
- Inline duct fan, control system, and method of controlling the same20 Aug 2026US 2026/0243455 A1Research Products Corporation
Most cited
By later US patents
- Turbofan gas turbine engine242US 4,827,712 AROLLS-ROYCE plc · 1989
- Fan shroud with integral air supply124US 5,881,685 ABoard of Trustees operating Michigan State University · 1999
- Cooling fan shroud121US 5,762,034 ABoard of Trustees operating Michigan State University · 1998
- Propulsive thrust ring system117US 5,393,197 ALemont Aircraft Corporation · 1995
- Heat exchange apparatus including a toroidal-type radiator108US 4,180,130 AInternational Harvester Company · 1979