Patents by Inventor Liu Yu-Zhong

Liu Yu-Zhong 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).

  • Lithium tantalum oxide coated tantalum articles with improved wear resistance and process for providing the same
    Patent number: 4810584
    Abstract: A tantalum niobium or tantalum-niobium alloy with a film containing polycrystalline lithium metal oxide wherein the metal corresponds to the metal from which the article is made, wherein the surface properties including hardness, yield strength, elasticity and electrical properties are improved so that the operating life can be increased and new application for such articles can be made.Tantalum spinnerets of the present invention have longer operating life, clog less and produce a better quality fiber.
    Type: Grant
    Filed: April 21, 1987
    Date of Patent: March 7, 1989
    Assignee: North China Research Institute of Electro-Optics
    Inventor: Liu Yu-Zhong
  • Process for providing lithium tantalum oxide coated tantalum articles with improved wear resistance
    Patent number: 4678546
    Abstract: A process for coating an article made of tantalum niobium or tantalum-niobium alloy with a film containing polycrystalline lithium metal oxide wherein the metal corresponds to the metal from which the article is made. More particularly, the process improves the surface properties including hardness, yield strength, elasticity and electrical properties so that the operating life can be increased and new application for such articles can be made.It is found that tantalum spinnerets treated in accordance with the process according to the present invention have longer operating life, clog less and produce a better quality fiber.
    Type: Grant
    Filed: March 27, 1985
    Date of Patent: July 7, 1987
    Assignee: North China Research Institute of Electro-Optics
    Inventor: Liu Yu-Zhong