Patents Examined by David Btutner
  • Method of manufacturing soft contact lens material
    Patent number: 4904708
    Abstract: Hydrophilic monomers in a supercooled, transparent state, are polymerized in the presence of water. The polymers have low levels of residual monomers and exhibit good mechanical strength. The process provides materials useful as contact lenses.
    Type: Grant
    Filed: May 31, 1988
    Date of Patent: February 27, 1990
    Assignees: Japan Atomic Energy Research Institute, Kabushiki Kaisha Tokyo Contact Lens Kenkyusho
    Inventors: Isao Kaetsu, Minoru Kumakura, Hidenari Suyama, Nobuo Kameda, Hideo Kouyama