Jack element with a stop-off
US7549489B2 · kind B2 · utility
19Cited by
8References
10Claims
0Family size
Inventors
Key dates
| Filing date | May 18, 2007 |
| Grant date | Jun 23, 2009 |
| Priority date | — |
| Expiry date | Nov 6, 2027 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/065
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
In one aspect of the present invention, a drill bit has a body intermediate a shank and a working face, the working face comprising a plurality of blades formed on the working face and extending outwardly from the bit body. Each blade comprises at least one cutting element. The drill bit also has a jack element coaxial with an axis of rotation and extending out of an opening formed in the working face. A portion of the jack element is coated with a stop-off.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.