- 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
|
2
|
5
|
13
|
4
|
5
|
5
|
4
|
2
|
0
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Joy Global Underground Mining LLC | 331 |
11 |
| Sandvik Mining and Construction G.m.b.H. | 85 |
8 |
| Caterpillar Global Mining Europe GmbH | 86 |
7 |
| Sandvik Intellectual Property AB | 1634 |
4 |
| Sandvik Mining and Construction Tools AB | 147 |
3 |
| Novamera Inc. | 7 |
3 |
| Caterpillar Inc. | 8877 |
2 |
| Alliance Coal, LLC | 7 |
1 |
| China University of Mining and Technology | 1189 |
1 |
| Herrenknecht AG | 186 |
1 |
| Joy MM Delaware, Inc. | 58 |
1 |
| Northeastern University | 493 |
1 |
| Antraquip Corporation | 1 |
1 |
| Xuzhou Zhirun Mining Equipment Science and Technology Co., Ltd. | 31 |
1 |
| Bucyrus DBT Europe GmbH | 10 |
1 |
| AB Sandvik Materials Technology, | 30 |
1 |
| Sandvik Powder Solutions AB | 3 |
1 |
| Northern Colorado Constructors, Inc. | 3 |
1 |
| HE BEI Jing Long Intelligent Equipment Co., Ltd. | 4 |
1 |
| Other owners | 0 |