Patents by Inventor William Pfingston

William Pfingston 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).

  • Diffusion transfer elements comprising U V light absorbers
    Patent number: 4148648
    Abstract: Improved diffusion transfer products having a light-reflecting layer which includes a U V absorber dispersed in the layer.
    Type: Grant
    Filed: February 16, 1977
    Date of Patent: April 10, 1979
    Assignee: Polaroid Corporation
    Inventor: William Pfingston