| 发明名称 |
Noise suppression drilling system |
| 摘要 |
The invention encompasses improvements in noise attenuation systems for reducing the audible noise level generated during earth boring operations using a hard surfaced rotary drill bit, and in dual bore-cutting elements for performing sequential first and second bore cutting to the design bore-gauge.
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| 申请公布号 |
US6427782(B2) |
申请公布日期 |
2002.08.06 |
| 申请号 |
US20000741589 |
申请日期 |
2000.12.19 |
| 申请人 |
THE WILLIAM J. BRADY LOVING TRUST |
发明人 |
BRADY WILLIAM J. |
| 分类号 |
C21D1/30;C21D6/04;C21D9/22;C23C30/00;E21B10/56;E21B10/573;E21B10/60;E21B17/03;E21B17/04;E21B17/10;E21B21/14;(IPC1-7):E21B21/08 |
主分类号 |
C21D1/30 |
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