Apparatus for extracting minerals through a borehole
US4278137A · kind A · utility
81Cited by
3References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 18, 1979 |
| Grant date | Jul 14, 1981 |
| Priority date | — |
| Expiry date | Jun 18, 1999 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21C27/10
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An apparatus consisting of pipe sections pivotally joined which can be insert in a borehole when in straight position and manipulated to a zigzag position to loosen minerals outside the wall of the borehole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.