Patents Assigned to Philadephia Quartz Company
  • Surface treated silica
    Patent number: 4029513
    Abstract: Microfine silicas that are useful as rubber reinforcing fillers and thickening agents, and are readily dispersible are prepared by modifying the surface layer of the silica. The surface modification results from including in or affixing to the surface of the silica certain inorganic polyvalent ions.
    Type: Grant
    Filed: June 11, 1975
    Date of Patent: June 14, 1977
    Assignee: Philadephia Quartz Company
    Inventors: Eric W. Vessey, James R. Miller, Klaus Robert Lange