Patents by Inventor Gerald Louis Ducharme

Gerald Louis Ducharme 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).

  • Combination of two timing layers for photographic products
    Patent number: 4061496
    Abstract: A temporary barrier between reactants in photographic products and especially for color diffusion transfer film units comprises two contiguous layers, one layer comprising a polymeric timing layer and having an activation energy of penetration of the layer by an aqueous alkaline solution of less than 18 kcal/mole and the second layer comprising a coalesced or partially coalesced polymeric latex and having an activation energy for the process of penetration of the layer by an aqueous alkaline solution of greater than 18 kcal/mole.
    Type: Grant
    Filed: April 14, 1976
    Date of Patent: December 6, 1977
    Assignee: Eastman Kodak Company
    Inventors: David Eugene Hannie, Gerald Louis Ducharme