E01B 3/30
Hollow sleepers
E01B3/30 (Hollow sleepers) appears on 5 US grants and 9 published applications in this corpus.
Search patents in E01B- Granted patents
- 5
- Published applications
- 9
- Assignees
- 6
- Inventors
- 22
- Latest grant
- 1 Jul 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 1 |
| 2017 | 0 | 1 |
| 2018 | 2 | 1 |
| 2019 | 1 | 1 |
| 2020 | 0 | 0 |
| 2021 | 0 | 1 |
| 2022 | 0 | 0 |
| 2023 | 1 | 1 |
| 2024 | 0 | 2 |
| 2025 | 1 | 0 |
By publication year.
Recent patents
- Railroad sleeper and process for manufacturing a railroad sleeper1 Jul 2025US 12,344,998 B2Braskem S/A
- Railroad sleeper and process for manufacturing a railroad sleeper16 May 2023US 11,649,592 B2Braskem S/A
- Modular system for the laying of underground and railroad and tram lines8 Oct 2019US 10,435,849 B2
- Rail tie having embedded automatic differential settlement compensation apparatus using oil pressure for railroad tracks27 Nov 2018US 10,138,604 B2Korea Railroad Research Institute
- Railway sleeper composed of fibre-reinforced stoneware12 Jun 2018US 9,995,006 B2
- Hollow sleeper11 Jul 2024US 2024/0229363 A9Schwihag AG
- Hollow sleeper25 Apr 2024US 2024/0133124 A1Schwihag AG
- Railroad sleeper and process for manufacturing a railroad sleeper10 Aug 2023US 2023/0250592 A1Braskem S/A
- Railroad sleeper and process for manufacturing a railroad sleeper17 Jun 2021US 2021/0180261 A1Braskem S/A
- Vibration dampening railway tie boot14 Nov 2019US 2019/0345675 A1Press-Seal Corporation
Most cited
By later US patents