Patents Examined by S. Silverburg
  • Coated substrate having a low coefficient of friction hydrophilic coating and a method of making the same
    Patent number: 4100309
    Abstract: A substrate is coated with a polyvinylpyrollidone-polyurethane interpolymer. In the method, a polyisocyanate and a polyurethane in a solvent such as methyl ethyl ketone are applied to a substrate and the solvent evaporated. If the substrate is a polyurethane, only the polyisocyanate need be employed. Polyvinylpyrollidone in a solvent is then applied to the treated substrate and the solvent evaporated. The invention is applied, for example, to a tube such as a catheter, a condom and a peristaltic pump tube.
    Type: Grant
    Filed: August 8, 1977
    Date of Patent: July 11, 1978
    Assignee: Biosearch Medical Products, Inc.
    Inventors: Michael J. Micklus, David T. Ou-Yang