B64C 2230/28
At propeller or rotor blades
Official title: at propeller or rotor blades
B64C2230/28 (At propeller or rotor blades) appears on 98 US grants and 81 published applications in this corpus.
Search patents in B64C- Granted patents
- 98
- Published applications
- 81
- Assignees
- 46
- Inventors
- 174
- Latest grant
- 10 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 3 | 0 |
| 2000 | 3 | 0 |
| 2001 | 3 | 0 |
| 2002 | 6 | 2 |
| 2003 | 3 | 1 |
| 2004 | 2 | 2 |
| 2005 | 0 | 1 |
| 2006 | 1 | 2 |
| 2007 | 1 | 1 |
| 2008 | 1 | 0 |
| 2009 | 1 | 1 |
| 2010 | 0 | 2 |
| 2011 | 0 | 1 |
| 2012 | 1 | 4 |
| 2013 | 2 | 3 |
| 2014 | 2 | 2 |
| 2015 | 2 | 1 |
| 2016 | 2 | 2 |
| 2017 | 4 | 11 |
| 2018 | 3 | 6 |
| 2019 | 6 | 2 |
| 2020 | 5 | 8 |
| 2021 | 18 | 16 |
| 2022 | 7 | 5 |
| 2023 | 7 | 3 |
| 2024 | 3 | 1 |
| 2025 | 0 | 0 |
| 2026 | 1 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Apparatus and method for fluid manipulation10 Mar 2026US 12,570,391 B2
- Method, system and apparatus for reducing fluid drag2 Apr 2024US 11,946,497 B213 Mari Ltd.
- Rotating airfoil assembly with opening formed therein to eject or to draw air2 Jan 2024US 11,858,615 B2General Electric Company
- Propeller-driven helicopter or airplane2 Jan 2024US 11,858,617 B2
- Method for managing the propulsive power of an aircraft12 Dec 2023US 11,840,338 B2Safran
- Wake Filling for Propeller Noise Reduction13 Aug 2026US 2026/0233829 A1Textron Aviation Inc.
- Propellers23 Jul 2026US 2026/0208854 A1OnwardAir, Inc.
- Rotary Propeller Featuring Enhanced Slot Effect Through Staggered Blade Configurations4 Jun 2026US 2026/0153096 A1
- Rotor and rotorcraft7 May 2026US 2026/0125152 A1Beijing Sankuai Online Technology Co., Ltd
- Aircraft generating larger thrust and lift by fluid continuity18 Apr 2024US 2024/0124131 A1
Most cited
By later US patents
- Reduction of turbomachinery noise149US 6,004,095 AMassachusetts Institute of Technology · 1999
- Active blowing system for rotorcraft vortex interaction noise reduction78US 5,813,625 AMcDonnell Douglas Helicopter Company · 1998
- Oscillating air jets on aerodynamic surfaces69US 5,938,404 AMcDonnell Douglas Helicopter Company · 1999
- Passively driven acoustic jet controlling boundary layers68US 6,379,110 B1United Technologies Corporation · 2002
- Helicopter lifting and propelling apparatus49US 4,169,567 A1979