Patents by Inventor John J. Magenheimer

John J. Magenheimer 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 film system with protective layer of copper salt, chitosan and selected polyols
    Patent number: 4386151
    Abstract: A silver diffusion transfer film unit which comprises, in order, a support, a silver precipitating layer, a protective layer comprising chitosan having a copper salt and a polyol selected from the group consisting of glycerol, sorbitol, polyvinyl alcohol, inositol, ethylene glycol, propylene glycol and hydroxyethyl cellulose disposed therein, a release layer, and a photosensitive silver halide layer. In a particularly preferred embodiment, the film unit is an additive color diffusion transfer film unit.
    Type: Grant
    Filed: July 22, 1982
    Date of Patent: May 31, 1983
    Assignee: Polaroid Corporation
    Inventors: Michael Berger, Charles H. Byers, John J. Magenheimer
  • Diffusion transfer film unit
    Patent number: 4366227
    Abstract: A diffusion transfer film unit comprising a support, a photosensitive silver halide emulsion layer, an image-receiving layer and, intermediate said silver halide emulsion layer and said image-receiving layer, a release layer which comprises a water-soluble polymer and a styrenated acid functional acrylic resin. In a preferred embodiment, the film unit is a silver diffusion transfer film unit.
    Type: Grant
    Filed: June 26, 1981
    Date of Patent: December 28, 1982
    Assignee: Polaroid Corporation
    Inventors: Michael Berger, John J. Magenheimer
  • Method for forming silver precipitating nuclei
    Patent number: 4259115
    Abstract: Noble metal silver precipitating nuclei are prepared by reducing a noble metal salt or complex in the presence of a polymer with a Sn.degree. suspension formed by the borohydride reduction of a tin salt. The invention is also directed to film units employing said nuclei.
    Type: Grant
    Filed: December 31, 1979
    Date of Patent: March 31, 1981
    Assignee: Polaroid Corporation
    Inventors: Raymond B. Hanselman, John J. Magenheimer, Kenneth G. Scott