Patents Examined by B. Steven Shapiro
  • Crystalline colloidal narrow band radiation filter
    Patent number: 4627689
    Abstract: A narrow wavelength band filtering device is provided by forming a highly ordered crystalline colloidal structure within a cell. The crystalline colloidal structure is relatively thin and has substantially planar and substantially parallel surface portions. The crystalline colloidal structure is formed by dispersing electrically charged particles, e.g., polystyrene spheres, within an appropriate solvent.
    Type: Grant
    Filed: December 8, 1983
    Date of Patent: December 9, 1986
    Assignee: University of Pittsburgh
    Inventor: Sanford A. Asher