- 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: 43
10-year publication summary
|
5
|
4
|
3
|
6
|
0
|
4
|
5
|
3
|
2
|
2
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
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. | 2072 |
2 |
| Kajima Corporation | 90 |
2 |
| Keiwa Inc. | 201 |
2 |
| HIRO Corporation Ltd. | 2 |
2 |
| Consejo Superior de Investigaciones Cientificas (csic) | 1443 |
1 |
| Cornerstone Research Group, Inc. | 68 |
1 |
| Hyperloop Technologies, Inc. | 123 |
1 |
| JFE Metal Products & Engineering Inc. | 5 |
1 |
| Next Innovation inc. | 40 |
1 |
| P.I. Engineering, Inc. | 12 |
1 |
| Putzmeister Engineering GmbH | 350 |
1 |
| SG Schaumglas GmbH & Co. KG | 8 |
1 |
| Shandong University | 1151 |
1 |
| Shonan Gosei-Jushi Seisakusho K.K. | 39 |
1 |
| Telene S.A.S. | 13 |
1 |
| Universität Innsbruck | 115 |
1 |
| Advantic LLC | 2 |
1 |
| Samsung C&T Corporation | 186 |
1 |
| Other owners | 13 |