- All sections
- E - Fixed constructions
- E21D - Shaftstunnelsgallerieslarge underground chambers
- E21D 20/00 - Setting anchoring-bolts
Patent holdings for IPC class E21D 20/00
Total number of patents in this class: 481
10-year publication summary
|
30
|
25
|
29
|
29
|
27
|
32
|
24
|
27
|
27
|
12
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| China University of Mining and Technology | 1256 |
27 |
| Sandvik Intellectual Property AB | 1482 |
25 |
| Sandvik Mining and Construction Oy | 836 |
21 |
| Epiroc Rock Drills Aktiebolag | 520 |
20 |
| J.H. Fletcher & Co. | 79 |
19 |
| Joy Global Underground Mining LLC | 347 |
19 |
| FCI Holdings Delaware, Inc. | 60 |
18 |
| 1311854 Ontario Limited | 19 |
15 |
| Hilti Aktiengesellschaft | 3498 |
13 |
| Sandvik Mining and Construction G.m.b.H. | 88 |
10 |
| Shanxi Tiandi Coal Mining Machinery Co., Ltd. | 20 |
10 |
| Atlas Copco Rock Drills AB | 141 |
8 |
| Shandong University of Science and Technology | 524 |
8 |
| Ccteg Taiyuan Research Institute | 9 |
7 |
| DYWIDAG-Systems International Pty Limited | 14 |
6 |
| HeNan Polytechnic University | 98 |
6 |
| FCI Holdings Delaware, LLC | 86 |
6 |
| OKA Rock Bolt Technologies Pty Limited | 7 |
5 |
| Sandvik Mining and Construction Lyon SAS | 13 |
5 |
| US Synthetic Corporation | 622 |
5 |
| Other owners | 228 |