Patents by Inventor David Eugene Hannie

David Eugene Hannie 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
  • Timing layer for color transfer film units comprising copolymer with activation energy to penetration greater than 18 kcal/mole
    Patent number: 4056394
    Abstract: A temporary barrier between reactants in photographic products and especially for color diffusion transfer film unit comprises a polymeric layer of at least partially coalesced latex, said layer having an activation energy of penetration by an aqueous alkaline solution of greater than 18 kcal/mole.
    Type: Grant
    Filed: April 14, 1976
    Date of Patent: November 1, 1977
    Assignee: Eastman Kodak Company
    Inventor: David Eugene Hannie
  • Processing compositions for color transfer processes comprising alkali metal fluorides and oxalates
    Patent number: 4028103
    Abstract: Improvements in the physical characteristics of a photographic assemblage, especially an integral transfer element, are obtained by employing an alkali metal salt in the alkaline processing composition used to process the assemblage. The anion of the salt has a solubility in relation to that of sulfate such that after processing in the presence of calcium and sulfate ions, calcium will combine with said anion in preference to sulfate at any given pH. Especially preferred salts are alkali metal fluorides or oxalates.
    Type: Grant
    Filed: April 12, 1976
    Date of Patent: June 7, 1977
    Assignee: Eastman Kodak Company
    Inventor: David Eugene Hannie