Patents by Inventor Lok Pratap Singh

Lok Pratap Singh 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).

  • Patent number: 6278056
    Abstract: A metal complex represented by the formula: (X)nML1L2, (X)2M(L1)2 or (L1)2ML2 wherein M represents a Group VIII metal, X represents a polar group, L1 represents a phenanthroline containing at least one carboxyl group which may be neutralized, L2 represents a nitrogen-containing polycyclic compound which may contain one or more substituents, and n is an integer of 1 or 2. A dye-sensitized oxide semiconductor electrode includes an electrically conductive body, an oxide semiconductor film provided on a surface of the electrically conductive body, and the above metal complex. A solar cell may be constructed from the above dye-sensitized oxide semiconductor electrode, a counter electrode, and a redox electrolyte contacting with both electrodes.
    Type: Grant
    Filed: March 18, 1999
    Date of Patent: August 21, 2001
    Assignee: Director-General of Agency of Industrial Science and Technology
    Inventors: Hideki Sugihara, Hironori Arakawa, Kazuhiro Sayama, Lok Pratap Singh, Mohammad Khaja Nazeeruddin, Michael Graetzel
  • Patent number: 6274806
    Abstract: A platinum complex represented by the formula PtL1/L2 or PtLX1/LX2 wherein L1 and L each represent a ligand selected from the group consisting of 2,2′-bipyridine compounds having at least one anionic group and 1,10-phenanthroline compounds having at least one anionic group, L2 represents a dithiolate selected from those represented by the formulas (a) through (d) shown in the specification, and X1 and X2 each represent a thiolate selected from those represented by the following formulas (e) and (f) shown in the specification. A dye-sensitized electrode includes a substrate having an electrically conductive surface, an oxide semiconductor film formed on the conductive surface, and the above platinum complex supported on the film. A solar cell includes the above electrode, a counter electrode, and an electrolyte disposed therebetween.
    Type: Grant
    Filed: March 27, 2000
    Date of Patent: August 14, 2001
    Assignee: Agency of Industrial Science and Technology
    Inventors: Hideki Sugihara, Kohjiro Hara, Kazuhiro Sayama, Hironori Arakawa, Ashraful Islam, Lok Pratap Singh