Patents by Inventor Anne M. Kruglewicz

Anne M. Kruglewicz 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).

  • Use of iron oxide pigments in a polymethyl methacrylate article
    Patent number: 4413089
    Abstract: A dispersion of iron oxide pigments, selected according to particle size to avoid interference with desired properties is added to a polymerizable acrylic composition containing alumina trihydrate as filler. This mixture is cured to form a filled polymeric structure containing 15 to 80% by weight polymethyl methacrylate and 20 to 85% by weight alumina trihydrate with a pleasing uniform color, maintaining desired properties of machinability, translucency, and visual depth.
    Type: Grant
    Filed: March 10, 1982
    Date of Patent: November 1, 1983
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Francis M. Gavin, Anne M. Kruglewicz