Methods and apparatuses for sampling fluid from a subterranean formation penetrated by a wellbore are provided. The subterranean formation has clean formation fluid therein, and the wellbore has a contaminated fluid therein extending into an invaded zone about the wellbore. A shaft is extended from a...http://www.google.de/patents/US7703517?utm_source=gb-gplus-sharePatent US7703517 - Downhole sampling tool and method for using same
