A putter incorporating a rearwardly-facing recess having a block member to facilitate proper stroking of the ball and the follow-through of the putter head during the putting operation. The head of the golf club has a proximal heel portion, a distal toe portion, and a central portion between the two...http://www.google.es/patents/US6083115?utm_source=gb-gplus-sharePatente US6083115 - Golf putter
