Patents by Inventor Ralph T. Brongo

Ralph T. Brongo 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 elements with incorporated hydrogen source photoreductant and tetrazolium salt
    Patent number: 4284704
    Abstract: Imaging means, such as a tetrazolium salt, capable of reduction to form a visible image is present in a radiation-sensitive layer in combination with a photoreductant incorporating one or more labile hydrogen atoms and capable of producing a reducing agent precursor in radiation-struck areas of the layer. An image is produced in the layer by processing the layer after imagewise exposure to actinic radiation.
    Type: Grant
    Filed: September 29, 1978
    Date of Patent: August 18, 1981
    Assignee: Eastman Kodak Company
    Inventors: James C. Fleming, Joseph W. Manthey, Ralph T. Brongo