Drill bit
Patent 4505342 Issued on March 19, 1985. Estimated Expiration Date: 
November 22, 2002. 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.
November 22, 2002. 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 2493178 3106973 3112803 3709308 3747699 Diamond drilling bit for soft and medium hard formations Cutter head, drill bit and similar drilling tools Earth-boring drill bits Eccentric counterbore for diamond insert stud Drill bit InventorsAssigneeApplicationNo. 06/443657 filed on 11/22/1982US Classes:175/428Preformed cutting element (e.g., compact) mounted on a distinct support (e.g., blank, stud, shank)ExaminersPrimary: Novosad, Stephen J.Assistant: Starinsky, Michael Attorney, Agent or FirmInternational ClassesE21B 10/56 (20060101)E21B 10/46 (20060101) E21B 10/60 (20060101) E21B 10/00 (20060101) AbstractA full bore drag type well drilling bit including a bit body comprised of a generally non-frangible metallic material. The bit body has an operating end face defined by said metallic material to include a plurality of upsets each having a leading edge and at least one recess extending through such leading edge into said metallic material. The end face further includes a plurality of flow paths, each of the leading edges of the upset having one such flow path extending therealong and inset therefrom. At least some of the upsets have a plurality of such recesses spaced therealong. A plurality of circulation ports open through the end face of the bit body, the number of circulation ports being less than the number of flow paths extending along the leading edges of the upsets, and at least some of the ports communicate with more than one such path. The bit further comprises a plurality of cutting structures carried by the bit body. Each cutting structure includes an elongate mounting body and a cutting formation on the exterior of the mounting body adjacent one end thereof. At least a majority of the mounting bodies of the bit are mounted in respective ones of the recesses in the upsets with their cutting formations facing outwardly along the leading edges of the upsets.Other References
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