- All sections
- E - Fixed constructions
- E21D - Shaftstunnelsgallerieslarge underground chambers
- E21D 20/02 - Setting anchoring-bolts with provisions for grouting
Patent holdings for IPC class E21D 20/02
Total number of patents in this class: 384
10-year publication summary
|
12
|
18
|
27
|
23
|
26
|
30
|
22
|
28
|
18
|
20
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| J-Lok Co. | 39 |
21 |
| Hilti Aktiengesellschaft | 3498 |
20 |
| Epiroc Rock Drills Aktiebolag | 520 |
15 |
| China University of Mining and Technology | 1256 |
13 |
| Sandvik Mining and Construction Oy | 836 |
12 |
| Innovative Mining Products (Pty) Ltd, TA New Concept Mining | 31 |
11 |
| NCM Innovations (Pty) Ltd | 35 |
10 |
| FCI Holdings Delaware, Inc. | 60 |
9 |
| Minova International Limited | 98 |
8 |
| Joy Global Underground Mining LLC | 347 |
8 |
| Epiroc Drilling Tools Aktiebolag | 82 |
8 |
| FCI Holdings Delaware, LLC | 86 |
8 |
| Gazmick Pty Ltd | 8 |
7 |
| DYWIDAG-Systems International Pty Limited | 14 |
6 |
| Suomen Metallityö Oy | 6 |
6 |
| OKA Rock Bolt Technologies Pty Limited | 7 |
5 |
| HeNan Polytechnic University | 98 |
5 |
| JMBG GmbH + Co KG | 37 |
5 |
| Epiroc Drilling Tools AB | 8 |
5 |
| Friedr. Ischebeck GmbH | 28 |
4 |
| Other owners | 198 |