A sanitary napkin having an absorbent core with three longitudinally oriented trisections, a central trisection flanked by two outboard trisections. The absorbent core is formed of a single layer of tissue. The single layer of tissue is folded on itself to provide a two-ply thickness at each of the outboard...http://www.google.es/patents/US5460623?utm_source=gb-gplus-sharePatente US5460623 - Trisection sanitary napkin
