Mine tool roof bit insert
US5311959A · kind A · utility
20Cited by
5References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 13, 1992 |
| Grant date | May 17, 1994 |
| Priority date | — |
| Expiry date | Apr 13, 2012 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/58
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A mine tool roof bit insert has two flat parallel sides extending in the long dimension of the insert and has two uppermost slanted surfaces extending between the two flat parallel sides. There is a trough at the top of the insert, which is between the two uppermost slanted surfaces and which is substantially orthogonal to the two flat parallel sides.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.