Patents by Inventor Antonella Celada

Antonella Celada 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).

  • Ageing improvements of photographic elements comprising dextran
    Patent number: 5609986
    Abstract: The present invention relates to a process for improving the ageing properties of a silver halide photographic element, free of photolytically generated latent images, comprising a support bearing at least one light-sensitive silver halide emulsion layer and at least one light-insensitive layer, the silver halide light-sensitive emulsion layer including negative acting surface latent image-type silver halide grain in association with a contrast promoting agent and a hydrazine compound, by adding a total amount of at least 0.40 grams per square meter of dextran to at least said light-sensitive silver halide emulsion layer and/or to at least said light-insensitive layer.
    Type: Grant
    Filed: April 25, 1996
    Date of Patent: March 11, 1997
    Assignee: Minnesota Mining and Manufacturing
    Inventors: Rino Feduzi, Cristina Soncini, Antonella Celada, Salvatore Selvaggio, Ivo Zullo