Coring bit and method for obtaining a material core sample
Patent 6412575 Issued on July 2, 2002. Estimated Expiration Date: 
March 9, 2020. 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.
March 9, 2020. 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 drill bits for use in coring holes in subsurface formations Apparatus for use in cutting operations Patent #: 5987698 InventorsAssigneeApplicationNo. 521505 filed on 03/09/2000US Classes:175/20, Combined with earth removal (e.g., removing sample)175/58, Sampling of earth formations175/332, Core forming-type bit175/403Core forming typeExaminersPrimary: Neuder, William P.Attorney, Agent or FirmForeign Patent References
International ClassE21B 025/08AbstractThe present invention provides a brush bit for cutting a core sample from an unconsolidated formation with reduced fragmentation or damage to the core sample by using a plurality of stiff bristles to cut rock from around the core sample. The present invention also provides an improved method of obtaining a core sample from an unconsolidated formation.Other References
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