Patents by Inventor Raj N. Singh

Raj N. 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).

  • Composite containing coated fibrous material
    Patent number: 4889686
    Abstract: A composite is produced by depositing a slurry of infiltration-promoting material and organic binding material on a layer of boron nitride coated fibrous material forming a tape therewith on drying, firing the tape to burn out organic binding material and infiltrating the resulting porous body with a solution of boron and silicon.
    Type: Grant
    Filed: February 17, 1989
    Date of Patent: December 26, 1989
    Assignee: General Electric Company
    Inventors: Raj N. Singh, Achuta R. Gaddipati
  • Process for producing a filament-containing composite in a ceramic matrix
    Patent number: 4886682
    Abstract: A composite is produced by admixing a matrix-forming material with organic binding material, forming the resulting mixture into a tape, disposing a layer of spaced filaments between at least two of the tapes to form a layered structure, laminating the layered structure, heating the layered structure to remove organic binding material and hot pressing the resulting porous structure to form a composite containing spaced filaments.
    Type: Grant
    Filed: December 14, 1987
    Date of Patent: December 12, 1989
    Assignee: General Electric Company
    Inventors: Raj N. Singh, Achuta R. Gaddipati
  • Etched beta"-alumina ceramic electrolyte
    Patent number: 4425415
    Abstract: A cationically-conductive sodium beta"-alumina electrolyte showing asymmetric polarization is contacted with phosphoric acid to produce an etched electrolyte showing no asymmetric polarization.
    Type: Grant
    Filed: August 19, 1982
    Date of Patent: January 10, 1984
    Assignee: General Electric Company
    Inventor: Raj N. Singh
  • Porous electrolyte retainer for molten carbonate fuel cell
    Patent number: 4389467
    Abstract: A porous tile for retaining molten electrolyte within a fuel cell is prepared by sintering particles of lithium aluminate into a stable structure. The tile is assembled between two porous metal plates which serve as electrodes with fuels gases such as H.sub.2 and CO opposite to oxidant gases such as O.sub.2 and CO.sub.2. The tile is prepared with a porosity of 55-65% and a pore size distribution selected to permit release of sufficient molten electrolyte to wet but not to flood the adjacent electrodes.
    Type: Grant
    Filed: November 28, 1980
    Date of Patent: June 21, 1983
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Raj N. Singh, Joseph T. Dusek
  • Etched beta"-alumina ceramic electrolyte
    Patent number: 4381968
    Abstract: A cationically-conductive sodium beta"-alumina electrolyte showing asymmetric polarization is contacted with phosphoric acid to produce an etched electrolyte showing no asymmetric polarization.
    Type: Grant
    Filed: August 3, 1981
    Date of Patent: May 3, 1983
    Assignee: General Electric Company
    Inventor: Raj N. Singh
  • Method of etching to form cationically-conductive ceramic body
    Patent number: 4381216
    Abstract: A cationically-conductive polycrystalline body having a specific resistivity at its surface portion higher than its specific intrinsic resistivity is contacted with phosphoric acid to produce an etched body having a uniform specific intrinsic resistivity.
    Type: Grant
    Filed: August 3, 1981
    Date of Patent: April 26, 1983
    Assignee: General Electric Company
    Inventor: Raj N. Singh
  • Chemically polished ceramic body
    Patent number: 4374701
    Abstract: An alkali metal beta- and/or beta"-alumina polycrystalline body is chemically polished by contacting it at a polishing temperature with phosphoric acid of polishing concentration.
    Type: Grant
    Filed: August 3, 1981
    Date of Patent: February 22, 1983
    Assignee: General Electric Company
    Inventor: Raj N. Singh