Patents by Inventor Barbara A. Theobald

Barbara A. Theobald 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 product including a light-reflecting layer with carbon coated with reflecting material
    Patent number: 4272594
    Abstract: Photographic diffusion transfer products of the integral negative-positive type adapted to the provision of a diffusion transfer image retained within a permanent laminate having at least one developed silver halide emulsion, and viewable through a transparent support against a reflecting background, are described. A light-reflecting layer, comprising a polymeric binder matrix, a light-reflecting pigment and a light-absorbing particulate carbon-based pigment material, is employed in such products for the provision of opacification to permit in-light development and for the provision of a layer against which the diffusion transfer image may be viewed.
    Type: Grant
    Filed: December 4, 1978
    Date of Patent: June 9, 1981
    Assignee: Polaroid Corporation
    Inventors: Louis J. George, Barbara A. Theobald