A mailable advertising article includes a planar blank having first and second planar surfaces, and first and second fold lines dividing the planar blank into a back wall portion, a protective flap adjacent the back wall portion along the first fold line, and a pocket-forming flap adjacent the back wall...http://www.google.es/patents/US6024278?utm_source=gb-gplus-sharePatente US6024278 - Mailable advertising materials
