11.14.05
Patent No. US 6,500,446 B1: Research-ers for Virbac, Carros, France, patented a skin treatment with at least one cationic polymer that improves the activity of at least one active molecule (antiseptic, antibiotic, antiviral, antifungal, antiparasitic, insecticidal, acaricidal or antimitotic) and is contained in microparticles or nanoparticles.