Patents Examined by Lourdes Ellie Cruz
  • Glass microspheres for use in films and projection screen displays
    Patent number: 6765720
    Abstract: Glass microspheres and rear projection screens containing glass microspheres, which combine a desirable index of refraction (preferably, no greater than about 1.70) and low levels of defects (e.g., bubbles, visible haziness, frostiness, or opacity, substantially nonspherical shapes) upon formation are provided. Also provided is a coating method of placing microspheres on a film for use in a rear projection screen.
    Type: Grant
    Filed: January 8, 2001
    Date of Patent: July 20, 2004
    Assignee: 3M Innovative Properties Company
    Inventors: Geoffrey P. Morris, Jacqueline C. Rolfs, Leo A. Meyer, Robert S. Moshrefzadeh, Hsin-Hsin Chou, Billy J. Tompkins, Thomas N. Davis