A knife blade has an edge provided with a recessed portion of a wavy profile and extending from the heel to the tip of the blade. The recessed portion of the edge is composed of a plurality of thick segments and thin segments. The thick segments press against the sides of an incision of the cut surface...http://www.google.fr/patents/US5787591?utm_source=gb-gplus-shareBrevet US5787591 - Knife blade edge
