Patents by Inventor Elfriede Stockel

Elfriede Stockel 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).

  • White safelight handleable photographic film containing a filter dye layer
    Patent number: 5204231
    Abstract: A film containing a filter layer comprised of a combination of a green dye and a yellow dye, which prevents the blue wavelength of white safelight from exposing the film. The filter layer permits handling of the film under white safelight for longer periods of time.
    Type: Grant
    Filed: March 31, 1992
    Date of Patent: April 20, 1993
    Assignee: Konica Imaging, U.S.A., Inc.
    Inventors: Elfriede Stockel, Thomas R. Smith
  • Surface composition for a substrate and method of preparation
    Patent number: 4976997
    Abstract: The invention is a composition for forming a surface on a suitable substrate comprising(a) a water soluble polymer crosslinkable into a water-insoluble form;(b) a pigment component;(c) silica; and(d) a crosslinking agent.In a preferred embodiment, the polymer is an organic colloid such as polyvinyl alcohol, the pigment component comprises a water dispersible pigment such as titanium dioxide and clay, silica particles have diameters smaller than that of the pigment, and the crosslinking agent comprises a water soluble organic compound containing both an acid and carbonyl group, a water soluble dicarbonyl compound, and a suitable polymerizable resin.
    Type: Grant
    Filed: May 14, 1990
    Date of Patent: December 11, 1990
    Assignee: Chemco Technologies, Inc.
    Inventors: Elfriede Stockel, Cynthia L. Buchan
  • Surface composition for a substrate and method of preparation
    Patent number: 4935463
    Abstract: The invention is a composition for forming a surface on a suitable substrate comprising(a) a water soluble polymer crosslinkable into a water-insoluble form;(b) a pigment component;(c) silica; and(d) a crosslinking agent.In a preferred embodiment, the polymer is an organic colloid such as polyvinyl alcohol, the pigment component comprises a water dispersible pigment such as titanium dioxide and clay, silica particles have diameters smaller than that of the pigment, and the crosslinking agent comprises a water soluble organic compound containing both an acid and carbonyl group, a water soluble dicarbonyl compound, and a suitable polymerizable resin.
    Type: Grant
    Filed: June 15, 1987
    Date of Patent: June 19, 1990
    Assignee: Chemco Technologies, Inc.
    Inventors: Elfriede Stockel, Cynthia L. Buchan