- All sections
- E - Fixed constructions
- E21D - Shaftstunnelsgallerieslarge underground chambers
- E21D 15/30 - Telescopic props with parts held relatively to each other by friction or gripping, e.g. using wedges by means expanded or contracted by pressure applied through the medium of a fluid or quasi-fluid, e.g. rubber
Patent holdings for IPC class E21D 15/30
Total number of patents in this class: 8
10-year publication summary
|
1
|
0
|
3
|
2
|
0
|
0
|
0
|
0
|
0
|
0
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| FCI Holdings Delaware, LLC | 96 |
3 |
| Micon | 12 |
2 |
| Burrell Mining Products, Inc. | 5 |
1 |
| PERI GmbH | 164 |
1 |
| Nevada Industrial LLC | 3 |
1 |
| Other owners | 0 |