Patents by Inventor Robert D. Biggs

Robert D. Biggs 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).

  • Defluorination of fumed silica
    Patent number: 4363792
    Abstract: A process for defluorination of a fluoride-containing fumed silica, which comprises entraining the silica in a high velocity stream of steam at an elevated temperature for a few seconds and then separating the defluorinated silica from the steam, thereby obtaining a fumed silica product with a substantially reduced fluoride content.
    Type: Grant
    Filed: August 10, 1981
    Date of Patent: December 14, 1982
    Assignee: The Dow Chemical Company
    Inventors: Marylu B. Gibbs, Robert D. Biggs, David W. Alsgaard