- All sections
- B - Performing operationstransporting
- B64C - Aeroplaneshelicopters
- B64C 27/28 - Compound rotorcraft, i.e. aircraft using in flight the features of both aeroplane and rotorcraft with forward-propulsion propellers pivotable to act as lifting rotors
Patent holdings for IPC class B64C 27/28
Total number of patents in this class: 287
10-year publication summary
|
16
|
22
|
41
|
46
|
38
|
48
|
32
|
26
|
27
|
5
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Textron Innovations Inc. | 2304 |
40 |
| Bell Helicopter Textron Inc. | 1050 |
27 |
| Wisk Aero LLC | 221 |
16 |
| Leonardo S.p.A. | 664 |
11 |
| Joby Aero, Inc. | 302 |
9 |
| Bell Textron Inc. | 70 |
6 |
| General Electric Company | 13762 |
5 |
| Dalian University of Technology | 1519 |
5 |
| Kitty Hawk Corporation | 299 |
5 |
| Subaru Corporation | 3530 |
5 |
| Archer Aviation Inc. | 220 |
5 |
| Airbus Helicopters | 970 |
4 |
| Amazon Technologies, Inc. | 26625 |
4 |
| Autel Robotics Co. Ltd. | 1017 |
4 |
| Pterodynamics Inc | 6 |
4 |
| Aeronext Inc. | 164 |
4 |
| Denso Corporation | 24248 |
3 |
| Joby Aviation, Inc. | 4 |
3 |
| Karem Aircraft, Inc. | 38 |
3 |
| Supernal LLC, AKA Supernal | 89 |
3 |
| Other owners | 121 |