- All sections
- E - Fixed constructions
- E21D - Shaftstunnelsgallerieslarge underground chambers
- E21D 19/00 - Provisional protective covers for working space
Patent holdings for IPC class E21D 19/00
Total number of patents in this class: 32
10-year publication summary
|
0
|
3
|
5
|
1
|
4
|
3
|
0
|
1
|
6
|
0
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Sandvik Mining and Construction Oy | 839 |
5 |
| Anhui University of Science and Technology | 188 |
3 |
| Nordic Minesteel Technologies Inc. | 36 |
2 |
| Garibaldi S.A. | 7 |
2 |
| E. I. du Pont de Nemours and Company | 4012 |
1 |
| China University of Mining and Technology | 1265 |
1 |
| Geobrugg AG | 104 |
1 |
| J.H. Fletcher & Co. | 79 |
1 |
| Mine Support Products (Pty) Ltd | 3 |
1 |
| NV Bekaert SA | 744 |
1 |
| Rock Engineering (Aust) Pty Ltd. | 3 |
1 |
| Shandong University of Science and Technology | 527 |
1 |
| The University of Western Australia | 200 |
1 |
| DKR Manufacturing Inc. | 3 |
1 |
| China Communications Construction Company Limited | 14 |
1 |
| Sany Heavy Equipment Co., Ltd. | 77 |
1 |
| COREX Plastics (Australia) Pty Ltd | 3 |
1 |
| DE KOKER, Andreas Nicolaas | 1 |
1 |
| Inchalam SA - Industrias Chilenas de Alambre | 13 |
1 |
| Hunter Mining Methods Pty Ltd | 1 |
1 |
| Other owners | 4 |