Patents Examined by C. J. Webman
  • Patent number: 5077058
    Abstract: A one-step process for preparing cross-linked poly-.beta.-alanine as microspheres having narrow size distribution comprises polymerizing acrylamide with a polyfunctional compound copolymerizable with acrylamide (with the polyfunctional compound also acting as the cross-linking agent) in an organic solvent or a mixtured such solvents in the presence of an ionic polymerization initiator and a suspension agent. The resulting microspheres may be impregnated with a pharmaceutically or cosmetically active substance.
    Type: Grant
    Filed: June 14, 1990
    Date of Patent: December 31, 1991
    Assignee: L'Oreal
    Inventors: Claudine Lapoiriere, Claude Mahieu, Christos Papantoniou