- All sections
- E - Fixed constructions
- E21D - Shafts; tunnels; galleries; large underground chambers
- E21D 9/12 - Devices for removing or hauling away excavated material or spoil; Working or loading platforms
Patent holdings for IPC class E21D 9/12
Total number of patents in this class: 97
10-year publication summary
|
8
|
10
|
10
|
10
|
11
|
3
|
14
|
12
|
4
|
6
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Sandvik Intellectual Property AB | 1634 |
11 |
| Technological Resources Pty. Limited | 444 |
6 |
| Herrenknecht AG | 186 |
5 |
| China University of Mining and Technology | 1189 |
4 |
| China Railway Engineering Equipment Group Co., Ltd. | 40 |
3 |
| Hypersciences, Inc. | 43 |
3 |
| Drilling Technical Services (Pty) Ltd | 3 |
3 |
| China Railway Tunnel Group Co., Ltd | 24 |
3 |
| Bouygues Travaux Publics | 30 |
2 |
| Hazemag & EPR GmbH | 14 |
2 |
| Sandvik Mining and Construction G.m.b.H. | 85 |
2 |
| Torex Gold Resources Inc. | 6 |
2 |
| Joy Global Underground Mining LLC | 331 |
2 |
| Kawasaki Jukogyo Kabushiki Kaisha (trading as Kawasaki Heavy Industries, Ltd.) | 2856 |
2 |
| Master Sinkers (Pty) Ltd | 7 |
2 |
| TopEng Inc. | 5 |
2 |
| CPC Engineering Pty Ltd | 9 |
2 |
| China Coal Research Institute | 19 |
2 |
| Caterpillar Inc. | 8877 |
1 |
| Caterpillar Global Mining Europe GmbH | 86 |
1 |
| Other owners | 37 |