Conjugation of the photosensitizer in varying ratios to the polymer, such as polyvinyl alcohol, provides compositions which are readily...http://www.google.es/patents/US5053423?utm_source=gb-gplus-sharePatente US5053423 - Compositions for photodynamic therapy B???squeda avanzada de patentes N???mero de publicaci???nUS5053423 ATipo de publicaci???nConcesi???n N???mero de solicitudUS 07/498,042 Fech