High-velocity jet digging method
US4047580A · kind A · utility
52Cited by
1References
4Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Mar 12, 1976 |
| Grant date | Sep 13, 1977 |
| Priority date | — |
| Expiry date | Mar 12, 1996 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/18
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The method of digging by piercing soil and rock with a jet of liquid discharged at high velocity from a nozzle together with high-velocity air jets discharged from another nozzle arranged concentrically around the liquid nozzle, characterized by the velocity of the air jets being at least half the velocity of sound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.