Cutting means for drag drill bits
Patent 4606418 Issued on August 19, 1986. Estimated Expiration Date: 
July 26, 2005. 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.
July 26, 2005. 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 1388490 Fluid passage formed by diamond insert studs for drag bits Insert retention and cooling apparatus for drag bits Rotary drill bit Drill bit with self cleaning nozzle Cutting member for rotary drill bit Patent #: 4498549 InventorAssigneeApplicationNo. 06/759459 filed on 07/26/1985US Classes:175/429, Including a nozzle175/339With drilling fluid conduit detailsExaminersPrimary: Leppink, James A.Assistant: Melius, Terry Lee Attorney, Agent or FirmInternational ClassesE21B 10/00 (20060101)E21B 10/60 (20060101) E21B 10/56 (20060101) E21B 10/46 (20060101) AbstractA rotary drill bit (10) having a plurality of diamond cutting elements (48) each having a cutting face (60) with a discharge nozzle (64) therein. The discharge nozzle (64) directs the flow of drilling fluid away from the cutting face (60) and is surrounded by the cutting face (60). | |
