E21D 9/03
Driving non-circular tunnels
Official title: {Driving non-circular tunnels}
E21D9/03 (Driving non-circular tunnels) appears on 5 US grants and 7 published applications in this corpus.
Search patents in E21D- Granted patents
- 5
- Published applications
- 7
- Assignees
- 5
- Inventors
- 33
- Latest grant
- 3 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 2015 | 1 | 1 |
| 2016 | 0 | 0 |
| 2017 | 0 | 1 |
| 2018 | 0 | 0 |
| 2019 | 1 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 1 |
| 2023 | 1 | 2 |
| 2024 | 0 | 2 |
| 2025 | 1 | 0 |
| 2026 | 1 | 0 |
By publication year. 2026 runs to 8 Oct.
Recent patents
- Tunnel tunneling system3 Mar 2026US 12,565,837 B2Ccteg Taiyuan Research Institute
- Method and system of constructing an underground tunnel5 Aug 2025US 12,378,884 B2hyperTunnel IP Limited
- Method and system of constructing an underground tunnel28 Feb 2023US 11,591,908 B2hyperTunnel IP Limited
- Method and apparatus for forming tunnels for transport routes2 Jul 2019US 10,337,326 B2
- Earth pressure balance shield machine without cutter disk28 Apr 2015US 9,016,801 B2China Railway Engineering Equipment Group Co., Ltd.
- Tunnel Tunneling System18 Jul 2024US 2024/0240560 A1Ccteg Taiyuan Research Institute
- Tunnel Extraction Machine (TEM)7 Mar 2024US 2024/0076983 A1TopEng Inc.
- Tunnelling shield22 Jun 2023US 2023/0193758 A1hyperTunnel IP Limited
- Method and system of constructing an underground tunnel8 Jun 2023US 2023/0175395 A1hyperTunnel IP Limited
- Method and system of constructing an underground tunnel6 Jan 2022US 2022/0003115 A1hyperTunnel IP Limited
Most cited
By later US patents
No patent in this class has been cited by a later US patent yet.