Earth-boring drill bits
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
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Sep 28, 1982
Issued Date -
N/A
app pub date -
Jun 13, 1980
filing date -
Jun 8, 1978
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to the design of earth bore-hole drill bits embodying shaped preformed cutters containing hard abrasive materials, such as diamonds, the cutters being mounted in companion preformed sockets in the hard metal bit matrix. The extent of penetration of the preformed cutters into the formation being drilled is controlled by providing surface set diamonds embedded in the matrix at or adjacent to its gage portion, the surface set diamonds projecting from the matrix to a much lesser extent than the preformed cutters. As a result, the surface set diamonds can penetrate into the formation only to the extent determined by engagement of the adjacent face of the matrix with the formation. Although the preformed cutters project from the matrix to a greater distance than the surface set diamonds, their extent of penetration into the formation is no greater than that of the surface set diamonds.
First Claim
Other Claims data not available
Family
| Country | kind | publication No. | Filing Date |
|---|---|---|---|
| US | A | US4244432 | Jun 08, 1978 |
International Classification(s)
- 1980 Application Filing Year
- E21B Class
- 685 Applications Filed
- 7 Patents Issued To-Date
- 1.03 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 143 Citation Count
- E21B Class
- 0 % this patent is cited more than
- 43 Age