- All sections
- E - Fixed constructions
- E21D - Shaftstunnelsgallerieslarge underground chambers
- E21D 11/28 - Longitudinal struts
Patent holdings for IPC class E21D 11/28
Total number of patents in this class: 5
10-year publication summary
|
0
|
1
|
0
|
0
|
1
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0
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1
|
0
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0
|
0
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| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Officine Maccaferri Italia S.r.l. | 3 |
2 |
| ELAS Geotecnica S.r.l. | 7 |
1 |
| Officine Maccaferri S.p.A. | 104 |
1 |
| FCI Holdings Delaware, LLC | 87 |
1 |
| Other owners | 0 |