A particulate object conveying device is provided, and the conveying device includes a stagnating portion. A rotor has an outer circumference having a plurality of grooves formed equidistantly about the outer circumference, the grooves being of a size and shape to hold a single one of the particles of...http://www.google.de/patents/US6203249?utm_source=gb-gplus-sharePatent US6203249 - Particulate objects conveying apparatus for conveying particles of a predetermined size
