Patents by Inventor Gerard Hild

Gerard Hild has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Polyurethane hydrogels and process for their manufacture
    Patent number: 4644033
    Abstract: The hydrogels consist essentially of the polyurethane of polyoxyethylene. The crosslinking is carried out by a reaction of a polyfunctional isocyanate with the polyoxyethylene in solution in a non-aqueous solvent. Transparent hydrogels are obtained, having a high swelling ratio in the presence of water and good mechanical properties.
    Type: Grant
    Filed: May 23, 1985
    Date of Patent: February 17, 1987
    Assignee: Essilor International
    Inventors: Yves Gnanou, Gerard Hild