Retana is a listed inventor on over forty patents and patent applications. <ref>[https://patents.justia.com/inventor/alvaro-retana Justia Patent Database - Alvaro Retana]</ref> | Retana is a listed inventor on over forty patents and patent applications. <ref>[https://patents.justia.com/inventor/alvaro-retana Justia Patent Database - Alvaro Retana]</ref> |