- All sections
- E - Fixed constructions
- E21C - Mining or quarrying
- E21C 27/22 - Mineral freed by means not involving slitting by rotary drills with breaking-down means, e.g. wedge-shaped drills
Patent holdings for IPC class E21C 27/22
Total number of patents in this class: 50
10-year publication summary
|
2
|
3
|
9
|
2
|
3
|
3
|
4
|
2
|
1
|
0
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Joy Global Underground Mining LLC | 350 |
11 |
| Sandvik Mining and Construction G.m.b.H. | 87 |
8 |
| Caterpillar Global Mining Europe GmbH | 85 |
6 |
| Sandvik Intellectual Property AB | 1470 |
4 |
| Novamera Inc. | 13 |
4 |
| Sandvik Mining and Construction Tools AB | 175 |
3 |
| Caterpillar Inc. | 9687 |
1 |
| Alliance Coal, LLC | 7 |
1 |
| China University of Mining and Technology | 1269 |
1 |
| Herrenknecht AG | 203 |
1 |
| Joy MM Delaware, Inc. | 56 |
1 |
| Northeastern University | 546 |
1 |
| Antraquip Corporation | 1 |
1 |
| Xuzhou Zhirun Mining Equipment Science and Technology Co., Ltd. | 31 |
1 |
| Bucyrus DBT Europe GmbH | 9 |
1 |
| AB Sandvik Materials Technology, | 28 |
1 |
| Sandvik Powder Solutions AB | 2 |
1 |
| Northern Colorado Constructors, Inc. | 3 |
1 |
| HE BEI Jing Long Intelligent Equipment Co., Ltd. | 4 |
1 |
| Caterpillar Inc. | 2 |
1 |
| Other owners | 0 |