B64C 27/48
Root attachment to rotor head
B64C27/48 (Root attachment to rotor head) appears on 293 US grants and 273 published applications in this corpus.
Search patents in B64C- Granted patents
- 293
- Published applications
- 273
- Assignees
- 86
- Inventors
- 441
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 6 | 0 |
| 1978 | 5 | 0 |
| 1979 | 2 | 0 |
| 1980 | 0 | 0 |
| 1981 | 4 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 5 | 0 |
| 1986 | 3 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 3 | 0 |
| 1990 | 2 | 0 |
| 1991 | 3 | 0 |
| 1992 | 0 | 0 |
| 1993 | 4 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 3 | 0 |
| 2002 | 0 | 3 |
| 2003 | 1 | 0 |
| 2004 | 3 | 1 |
| 2005 | 1 | 1 |
| 2006 | 0 | 3 |
| 2007 | 3 | 3 |
| 2008 | 1 | 4 |
| 2009 | 2 | 3 |
| 2010 | 6 | 4 |
| 2011 | 2 | 2 |
| 2012 | 2 | 6 |
| 2013 | 3 | 10 |
| 2014 | 4 | 14 |
| 2015 | 14 | 11 |
| 2016 | 15 | 11 |
| 2017 | 12 | 65 |
| 2018 | 7 | 19 |
| 2019 | 27 | 37 |
| 2020 | 56 | 16 |
| 2021 | 26 | 11 |
| 2022 | 15 | 11 |
| 2023 | 9 | 9 |
| 2024 | 10 | 14 |
| 2025 | 12 | 8 |
| 2026 | 8 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Helicopter rotor head structure15 Sep 2026US 12,735,178 B2Tibet Chuangbo General Aviation Technology Co., Ltd.
- Multicopter with self-adjusting rotors8 Sep 2026US 12,730,452 B2Kitty Hawk Corporation
- Strap pack support tool for helicopter maintenance19 May 2026US 12,630,304 B2The United States of America as represented by the Secretary of the Army
- Rotor with offset28 Apr 2026US 12,612,157 B1Textron Innovations Inc.
- Hybrid pitch bearing for rigid rotor7 Apr 2026US 12,595,047 B2Lockheed Martin Corporation
- Vertical take-off and landing aircraft3 Sep 2026US 2026/0257806 A1
- Propulsor drive shaft with branched portion23 Jul 2026US 2026/0208859 A1Beta Air, LLC
- Hybrid pitch bearing for rigid rotor16 Jul 2026US 2026/0200573 A1Lockheed Martin Corporation
- Rotary aircraft passive rotor tip lighting system7 May 2026US 2026/0125161 A1Honeywell International Inc.
- Strap Pack Support Tool for Helicopter Maintenance30 Apr 2026US 2026/0116579 A1The United States of America as represented by the Secretary of the Army
Most cited
By later US patents
- Composite spar structure having integral fitting for rotational hub mounting49US 4,260,332 AStructural Composite Industries, Inc. · 1981
- Laminated bearing with plural modulus layer40US 4,105,266 ALord Corporation · 1978
- Rotor redundant force retention system for VTOL and VSTOL aircraft37US 5,059,094 ABell Helicopter Textron Inc. · 1991
- Two-place, collective pitch and throttle control35US 8,844,880 B1Groen Brothers Aviation, Inc. · 2014
- Lift fan position lock mechanism35US 9,783,288 B1Kitty Hawk Corporation · 2017