Corner-cutting mining assembly
US4400036A · kind A · utility
3Cited by
4References
5Claims
0Family size
Inventor
Key dates
| Filing date | Jul 1, 1981 |
| Grant date | Aug 23, 1983 |
| Priority date | — |
| Expiry date | Jul 1, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21C27/20
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A mining assembly includes a primary rotary cutter mounted on one end of a support shaft and four secondary rotary cutters carried on the same support shaft and positioned behind the primary cutters for cutting corners in the hole cut by the latter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.