Patents by Inventor Elaine H. Hoffmeister

Elaine H. Hoffmeister 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).

  • Photographic products and processes employing novel nondiffusible pyridylazonaphthol dye-releasing compounds
    Patent number: 4165238
    Abstract: Photographic elements, diffusion transfer assemblages and processes are described which employ a novel nondiffusible compound having a releasable 2-(5-nitro-2-pyridylazo)-1-naphthol dye moiety. The compound contains a ballasted carrier moiety which is capable of releasing the diffusible azo dye under alkaline conditions. The dye is transferred imagewise to an image-receiving layer where it is contacted with metal ions to form a metal-complexed azo dye transfer image of excellent stability.
    Type: Grant
    Filed: July 24, 1978
    Date of Patent: August 21, 1979
    Assignee: Eastman Kodak Company
    Inventors: Richard B. Anderson, Elaine H. Hoffmeister, Richard A. Landholm
  • Photographic products and processes employing novel nondiffusible pyridylazonaphthol dye-releasing compounds
    Patent number: 4147544
    Abstract: Photographic elements, diffusion transfer assemblages and processes are described which employ a novel nondiffusible compound having a releasable 2-(5-nitro-2-pyridylazo)-1-naphthol dye moiety. The compound contains a ballasted carrier moiety which is capable of releasing the diffusible azo dye under alkaline conditions. The dye is transferred imagewise to an image-receiving layer where it is contacted with metal ions to form a metal-complexed azo dye transfer image of excellent stability.
    Type: Grant
    Filed: September 12, 1977
    Date of Patent: April 3, 1979
    Assignee: Eastman Kodak Company
    Inventors: Richard B. Anderson, Elaine H. Hoffmeister, Richard A. Landholm