B64C 11/28
Collapsible or foldable blades
B64C11/28 (Collapsible or foldable blades) appears on 299 US grants and 290 published applications in this corpus.
Search patents in B64C- Granted patents
- 299
- Published applications
- 290
- Assignees
- 89
- Inventors
- 355
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 3 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 3 | 0 |
| 1986 | 0 | 0 |
| 1987 | 3 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 6 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 2 | 3 |
| 2003 | 4 | 2 |
| 2004 | 0 | 0 |
| 2005 | 0 | 2 |
| 2006 | 1 | 0 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 2 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 1 | 1 |
| 2014 | 2 | 0 |
| 2015 | 1 | 5 |
| 2016 | 4 | 11 |
| 2017 | 8 | 18 |
| 2018 | 19 | 46 |
| 2019 | 32 | 44 |
| 2020 | 49 | 35 |
| 2021 | 29 | 33 |
| 2022 | 30 | 22 |
| 2023 | 32 | 27 |
| 2024 | 27 | 16 |
| 2025 | 20 | 13 |
| 2026 | 10 | 9 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Distributed propulsion system for vertical take off and landing closed wing aircraft8 Sep 2026US 12,728,983 B2Textron Innovations Inc.
- Universal-joint rotor-hub method and system30 Jun 2026US 12,668,359 B2Textron Innovations Inc.
- Distributed propulsion system for vertical take off and landing closed wing aircraft23 Jun 2026US 12,662,237 B2Textron Innovations Inc.
- Reduced noise rotor for aerial vehicles9 Jun 2026US 12,649,591 B2Zipline International Inc.
- Nose cone26 May 2026US 12,637,201 B2Skydio, Inc.
- Aerial vehicle with deployable components17 Sep 2026US 2026/0274396 A1Anduril Industries, Inc.
- Rotor hub for propeller-driven aircraft, and assembly comprising such a rotor hub10 Sep 2026US 2026/0264841 A1Maxon International AG
- Foldable rotary wing aircraft9 Jul 2026US 2026/0192911 A1Lockheed Martin Corporation
- Double hinged tilting mount for coaxial contra rotating electric propulsion25 Jun 2026US 2026/0175972 A1Lockheed Martin Corporation
- Foldable Propeller Hub Mechanisms Based on Rolling Elements11 Jun 2026US 2026/0159222 A1Emraer SA
Most cited
By later US patents
- Aerodynamically efficient lightweight vertical take-off and landing aircraft with pivoting rotors and stowing rotor blades170US 9,694,911 B2Joby Aviation, Inc. · 2017
- Deployable folded propeller assembly for aerial projectiles115US 6,308,632 B12001
- Aircraft with selectively attachable passenger pod assembly112US 9,963,228 B2Bell Helicopter Textron Inc. · 2018
- Aircraft with independently controllable propulsion assemblies89US 10,183,746 B2Bell Helicopter Textron Inc. · 2019
- Aircraft with a plurality of propellers, a pipe structure for thereon holdable wings, for vertical take off and landing83US 4,982,914 A1991