Diamond drill bit with varied cutting elements
USRE33757E · kind E · reissue
19Cited by
7References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 23, 1990 |
| Grant date | Dec 3, 1991 |
| Priority date | — |
| Expiry date | Feb 23, 2010 |
Classification
- Technology area (CPC —)General
Abstract
An earth boring bit utilizing thermally stable polycrystalline diamond material having a row of closely spaced sharp cutting elements, following by a row of widely spaced, blunt or rounded cutting elements, each cutting element extending from a supporting matrix a predetermined amount to allow the sharp cutting elements to form small relief kerfs in a geological formation, after which the blunt or rounded cutting elements dislodge material between the kerfs. Additionally, cylindrical cutting elements are positioned near the gage or outermost portion of the matrix to enhance gage bore cutting.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.