Patents by Inventor Donald J. Fischer

Donald J. Fischer 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).

  • Pourable granulated siliceous insulation
    Patent number: 3950259
    Abstract: A thermal insulation composition is described which is dry, free-flowing, granular, and has a thermal conductivity approximately that of dry still air. The composition contains two granular siliceous materials and a granular opacifier. The first siliceous material is coarser and denser, and provides the principal bulk density of the final mixture. The second siliceous material is quite fine, and provides the principal free-flowing properties of the mixture. In a preferred embodiment a third siliceous material is also included to increase the overall surface area.
    Type: Grant
    Filed: May 29, 1973
    Date of Patent: April 13, 1976
    Assignee: Johns-Manville Corporation
    Inventors: John M. Pallo, Donald J. Fischer