E21D 17/10
Details of mine caps for engaging the tops of pit-props, with or
Official title: Details of mine caps for engaging the tops of pit-props, with or without retaining-plates; Retaining-plates
E21D17/10 (Details of mine caps for engaging the tops of pit-props, with or) appears on 4 US grants and 0 published applications in this corpus.
Search patents in E21D- Granted patents
- 4
- Published applications
- 0
- Assignees
- 4
- Inventors
- 6
- Latest grant
- 24 Feb 1987
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Non-crosslinked polyether-ketones which can be processed by a thermoplastic method, and their preparation24 Feb 1987US 4,645,819 ABASF SE
- Heavy duty adjustable prop with a ball-and-socket joint4 Nov 1980US 4,231,672 ACharbonnages de France
- Mine roof supports20 Jun 1978US 4,095,432 AFletcher Sutcliffe Wild Limited
- Ball-and-socket type connections for use with mining apparatus25 Jan 1977US 4,004,771 AGewerkschaft Eisenhutte Westfalia
No published applications in this class yet.
Most cited
By later US patents
- Ball-and-socket type connections for use with mining apparatus10US 4,004,771 AGewerkschaft Eisenhutte Westfalia · 1977
- Non-crosslinked polyether-ketones which can be processed by a thermoplastic method, and their preparation7US 4,645,819 ABASF SE · 1987
- Heavy duty adjustable prop with a ball-and-socket joint3US 4,231,672 ACharbonnages de France · 1980