Patent ID: 7909119

Claim:
An in-ground, core drill bit for obtaining a material sample, comprising: a shank for attaching to a drill string component; a cylindrical cutting portion secured to said shank, said cutting portion including an inner surface, an outer surface, and a cutting face, wherein the outer diameter of said cutting portion is greater than the outer diameter of said shank; one or more fluid notches extending from said inner surface to said outer surface and extending a first distance from said cutting face into said cutting portion; one or more enclosed fluid slots extending from said inner surface to said outer surface, said one or more enclosed fluid slots commencing at a second distance from said cutting face and extending toward said shank, wherein said second distance is equal to or greater than said first distance, wherein said one or more enclosed fluid slots are adapted to become fluid notches as said cutting portion erodes during drilling; and at least one flute extending at least partially into said cylindrical cutting portion.