Patent ID: 7490976

Claim:
Device for mixing, homogenizing, extracting, or slurrying materials in a laboratory test vessel ( 70 ), the device comprising a lid ( 10 ) with projections and a sealing lip to hermetically seal the laboratory test vessel, a stirrer element ( 30 ) being provided in the lid ( 10 ) for processing of the material ( 71 ) that can be placed into the laboratory test vessel ( 70 ), said stirrer element being connected to a coupling piece ( 50 ), and said stirrer element ( 30 ), which rotates about a longitudinal axis of the laboratory test vessel ( 70 ) being provided with cutting and/or crushing elements ( 31 ; 33 , 35 ) situated directly adjacent to cutting edges ( 42 , 44 ; 41 , 43 , 45 ) on a retainer sleeve ( 40 ), wherein the stirrer element ( 30 ) is a hollow cylinder ( 53 ) and is provided with a central sealing cap ( 32 ) that is a membrane that can be pierced or broken through.