Patents by Inventor Sanford A. Asher

Sanford A. Asher 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).

  • Crystalline colloidal narrow band radiation filter
    Patent number: 4632517
    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.The filtering device of the present invention may form the basis for a mechanically simple and highly efficient monochromator, as well as find application in an improved system for investigating the Raman and/or emission spectra of selected sample materials. In addition, a novel multiple wavelength atomic absortion or emission spectograph is provided utilizing the filter device of the present invention.
    Type: Grant
    Filed: June 21, 1984
    Date of Patent: December 30, 1986
    Assignee: University of Pittsburgh
    Inventor: Sanford A. Asher
  • 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