Primer centering device for large diameter blastholes
US4961381A · kind A · utility
18Cited by
8References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 12, 1989 |
| Grant date | Oct 9, 1990 |
| Priority date | — |
| Expiry date | May 12, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF42B3/185
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An improved method for reducing misfires in large diameter unlined blastholes by fitting on the primer used in the blasthole a centering device comprised of a semi-conducting plastic material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.