- All sections
- E - Fixed constructions
- E21D - Shaftstunnelsgallerieslarge underground chambers
- E21D 11/04 - Lining with building materials
Patent holdings for IPC class E21D 11/04
Total number of patents in this class: 40
10-year publication summary
|
3
|
4
|
4
|
3
|
6
|
0
|
4
|
5
|
3
|
1
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Agence Nationale pour La Gestion des Dechets Radioactifs | 51 |
4 |
| Constructions Mecaniques Consultants | 6 |
4 |
| Showa Denko K.K. | 2200 |
2 |
| Kajima Corporation | 85 |
2 |
| HIRO Corporation Ltd. | 2 |
2 |
| Consejo Superior de Investigaciones Cientificas (csic) | 1379 |
1 |
| Cornerstone Research Group, Inc. | 67 |
1 |
| Hyperloop Technologies, Inc. | 180 |
1 |
| JFE Metal Products & Engineering Inc. | 6 |
1 |
| Keiwa Inc. | 188 |
1 |
| Next Innovation inc. | 37 |
1 |
| Putzmeister Engineering GmbH | 341 |
1 |
| SG Schaumglas GmbH & Co. KG | 8 |
1 |
| Shandong University | 1054 |
1 |
| Shonan Gosei-Jushi Seisakusho K.K. | 38 |
1 |
| Telene S.A.S. | 13 |
1 |
| Advantic LLC | 2 |
1 |
| Samsung C&T Corporation | 187 |
1 |
| CrossCut Enterprises LLC | 2 |
1 |
| Changjiang Survey Planning Design and Research Limited Co. | 3 |
1 |
| Other owners | 11 |