Earth-boring drill bits
Patent 4244432 Issued on January 13, 1981. Estimated Expiration Date: 
June 8, 1998. 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.
June 8, 1998. 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 References 2693938 2960312 3106973 3693735 3696875 3709308 3747699 Rotary drill bit Diamond cutter rock bit with penetration limiting Patent #: 4006788 InventorsApplicationNo. 05/913571 filed on 06/08/1978US Classes:175/428, Preformed cutting element (e.g., compact) mounted on a distinct support (e.g., blank, stud, shank)175/432With support detailExaminersPrimary: Leppink, James A.Attorney, Agent or FirmInternational ClassesE21B 10/46 (20060101)E21B 10/56 (20060101) AbstractThe invention relates to the design of earth bore-hole drill bits employing shaped preform cutters containing hard abrasive materials, such as diamonds, the cutters being mounted in companion preformed sockets in a hard metal bit matrix.Field of SearchIndependently attachable | |
