Earth-boring bit with improved cutting structure
October 13, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesRotary rock bit with multiple row coverage for very hard formations Oil well drilling bit Earth-boring bit with improved cutting structure Rock bit Earth-boring bit with improved cutting structure Drill bit with protruding insert stabilizers Earth-boring bit with improved cutting structure Drill bit with dual reaming rows Earth-boring bit with super-hard cutting elements Patent #: 5758733 InventorsAssigneeApplicationNo. 170528 filed on 10/13/1998US Classes:175/371, With bearing or seal details175/331Rolling cutter bit or rolling cutter bit elementExaminersPrimary: Neuder, William P.Attorney, Agent or FirmInternational ClassE21B 010/00AbstractAn earth-boring bit has a bit body and at least one cutter rotatably secured to the bit body. The cutter has a cutter shell surface including a gage surface and a heel surface. A plurality of cutting elements inserts are arranged in generally circumferential rows on the cutter. At least one scraper cutting element is secured at least partially to the heel surface of the cutter. The scraper cutting element includes an outermost surface, generally aligned with the gage surface of the cutter, that defines a plow edge or point for shearing engagement with the sidewall of the borehole while redirecting cuttings up the borehole. | |
