- All sections
- E - Fixed constructions
- E21D - Shaftstunnelsgallerieslarge underground chambers
- E21D 3/00 - Raising shafts, i.e. working upwards from the bottom
Patent holdings for IPC class E21D 3/00
Total number of patents in this class: 19
10-year publication summary
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0
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2
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1
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1
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3
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2
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1
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0
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1
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2
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| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Atlas Copco Rock Drills AB | 123 |
3 |
| Epiroc Rock Drills Aktiebolag | 662 |
3 |
| Herrenknecht AG | 215 |
1 |
| Longyear TM, Inc. | 97 |
1 |
| Master Drilling South Africa (Pty) Ltd. | 3 |
1 |
| Poclain Hydraulics Industrie | 246 |
1 |
| Salini Impregilo S.p.A. | 1 |
1 |
| Orica International Pte Ltd | 200 |
1 |
| Jiangsu Hexin Petroleum Machinery Co., Ltd. | 8 |
1 |
| Sandvik Mining and Construction Tools AB | 199 |
1 |
| Ume Australia Pty Ltd | 1 |
1 |
| Redpath Canada Limited | 13 |
1 |
| WEBUILD S.p.A. | 32 |
1 |
| IDE Water Technologies Ltd. | 59 |
1 |
| China Three Gorges Construction Engineering Corporation | 16 |
1 |
| Other owners | 0 |