Patents by Inventor Ashok Kumar Dhingra

Ashok Kumar Dhingra 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).

  • Process for reinforcing aluminum alloy
    Patent number: 4053011
    Abstract: A composite reinforced with polycrystalline alumina fibers in a matrix of an aluminum alloy containing 0.5-5.5% by weight of the matrix of lithium is prepared by infiltrating alumina fibers with a molten alloy containing aluminum and 1-8% by weight of lithium for a time sufficient to form a reaction sheath on the fibers of a thickness less than about 15% of the total fiber diameter.
    Type: Grant
    Filed: September 17, 1976
    Date of Patent: October 11, 1977
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Paul Gordon Riewald, William Henry Krueger, Ashok Kumar Dhingra
  • Polycrystalline alumina fibers as reinforcement in magnesium matrix
    Patent number: 4036599
    Abstract: A fiber reinforced metal composite comprising magnesium or a magnesium alloy containing substantially aligned, polycrystalline alumina fibers which have certain surface roughness characteristics and contain at least 80% Al.sub.2 O.sub.3 by weight.
    Type: Grant
    Filed: August 15, 1975
    Date of Patent: July 19, 1977
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Ashok Kumar Dhingra
  • Aluminum alloy reinforced with alumina fibers and lithium wetting agent
    Patent number: 4012204
    Abstract: A composite reinforced with polycrystalline alumina fibers in a matrix of an aluminum alloy containing 0.5-5.5% by weight of the matrix of lithium is prepared by infiltrating alumina fibers with a molten alloy containing aluminum and 1-8% by weight of lithium for a time sufficient to form a reaction sheath on the fibers of a thickness less than about 15% of the total fiber diameter.
    Type: Grant
    Filed: September 22, 1975
    Date of Patent: March 15, 1977
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Paul Gordon Riewald, William Henry Krueger, Ashok Kumar Dhingra