Earth-boring bit having cobalt/tungsten carbide inserts
US6244364A · kind A · utility
8Cited by
16References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 22, 1999 |
| Grant date | Jun 12, 2001 |
| Priority date | — |
| Expiry date | Jan 22, 2019 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/52
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An earth-boring device such as a drill bit is disclosed. The earth boring device includes a rotary main cutting structure, an insert on the main cutting structure. The insert is formed of a composition having tungsten carbide and cobalt. The cobalt makes up less than approximately 9% by weight of the composition. The composition has a Rockwell A hardness greater than approximately an H.sub.min as determined by the following formula: H.sub.min =91.1-0.63X, where X represents a cobalt content by weight of the composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.