Rotary drill bits
US4382477A · kind A · utility
31Cited by
17References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 9, 1981 |
| Grant date | May 10, 1983 |
| Priority date | — |
| Expiry date | Jan 9, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T407/1936
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
In a rotary drilling bit having preform cutting elements, a partial or total structural discontinuity is disposed between the elements and the underlying structure or within the underlying structure to reduce the bending strain upon the preform cutting elements. In this way there is a reduction in the fracture or damage of preform cutting elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.