Drilling tool formed of a core-and-casing assembly
US4813823A · kind A · utility
41Cited by
5References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 14, 1987 |
| Grant date | Mar 21, 1989 |
| Priority date | — |
| Expiry date | Jan 14, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T408/9097
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A drilling tool which has at least one helical fluid flow channel at its interior, is composed of a hard metal core having an exterior surface and a hard metal tubular casing having an interior surface. The casing encloses the core with their surfaces in firm contact so that the core and casing form a composite body. Each channel is formed as a groove in the surface of the core or casing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.