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US Patent 8141664 Hybrid drill bit with high bearing pin angles

Patent 8141664 was granted and assigned to Baker Hughes on March, 2012 by the United States Patent and Trademark Office.

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Patent abstract

A hybrid drill bit having at least two rolling cutters, each rotatable around an axis of rotation, at least one of the rolling cutters having a high pin angle, and at least one fixed blade. The pin angle can encompass pin angles above 39 degrees to less than 393 degrees. The drill bit can allow the rolling cutters to engage a shoulder portion and/or gage portion of the bit profile and assist the fixed blade(s) in these areas. The at least two rolling cutters can be disposed at different pin angles.

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