Patents by Inventor Todd Richardson

Todd Richardson 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).

  • Dyed silica pigments and products made from same
    Patent number: 5885343
    Abstract: The adsorption of cationic dyes on nanosize negatively charged silica particles to form colored pigments is disclosed. The dyes are chemisorbed and their uptake is controlled by the strong chemical reaction between the negative surface of the adsorbent silica particles preferably with sodium counter ions and the positive charge of the dyes. The prepared pigments are useful in the formation of color films and their optical properties are described. Photoresists using nanosized pigments are also disclosed herein which are useful in making color filters for liquid crystal displays.
    Type: Grant
    Filed: May 30, 1997
    Date of Patent: March 23, 1999
    Assignee: Shipley Company, L.L.C.
    Inventors: George J. Cernigliaro, Egon Matijevic, Daniel Y. Pai, Todd A. Richardson
  • Dye incorporated pigments and products made from same
    Patent number: 5871872
    Abstract: The adsorption of anionic dyes on nanosize alumina modified silica particles to form colored pigments is disclosed. The dyes are chemisorbed and their uptake is controlled by the strong chemical reaction between positive surface of the absorbent and negative charge of the adsorbates. The prepared pigments are useful in the formation of color films and their optical properties are described. Photoresists using nanosized pigments are also disclosed herein which are useful in making color filters for liquid crystal displays.
    Type: Grant
    Filed: May 30, 1997
    Date of Patent: February 16, 1999
    Assignee: Shipley Company, LL.C.
    Inventors: Egon Matijevic, George J. Cernigliaro, Yie-Shein Her, Daniel Y. Pai, Todd A. Richardson