Patents by Inventor Gil de Marignan

Gil de Marignan 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).

  • Method of releasing a transparent polymer material from a mold and its use in the fabrication of a transparent polymer material article such as an ophthalmic lens
    Patent number: 6171529
    Abstract: A method of releasing from the mold a transparent polymer material article formed in a cavity of a two-part mold by polymerizing a liquid polymerizable substance includes the step of uniformly heating the article in the mold to a mold release temperature in the range from Tg+20° C. to Tg+80° C., where Tg is the glass transition temperature of the transparent polymer material, without separating the article and the mold parts. An external mechanical force is applied to separate at least one of the mold parts from the article while it is at the mold release temperature.
    Type: Grant
    Filed: March 19, 1999
    Date of Patent: January 9, 2001
    Assignee: Essilor International Compagnie General d'Optique
    Inventors: Gil de Marignan, Gaston Derozier