- All sections
- E - Fixed constructions
- E21C - Mining or quarrying
- E21C 27/44 - Planing knives
Patent holdings for IPC class E21C 27/44
Total number of patents in this class: 5
10-year publication summary
|
0
|
1
|
0
|
0
|
0
|
0
|
0
|
1
|
1
|
0
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Optima Mining Systems Pty Ltd | 3 |
3 |
| Bucyrus Europe GmbH | 32 |
1 |
| Joy Global Underground Mining LLC | 350 |
1 |
| Other owners | 0 |