Patents by Inventor Y. D. Kwon

Y. D. Kwon 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: 4883700
    Abstract: The present invention is an improved prepreg layer, multilayer composition based on the improved prepreg layer, and article made from the multilayer composite.The prepreg layer of the present invention comprises an array of at least one adjacent, coplanar fibrous element. Each element has a longitudinal axis and each element comprises a plurality of unidirectional coplanar fibers embedded in a polymeric matrix. The fibers are at an oblique angle to the longitudinal axis of the element. The fibers are up to eight inches, preferably from one to eight inches, and more preferably two to six inches long. The adjacent elements are connected by the polymer matrix. Typically, the elements are in strip or sheet form with the longitudinal axis corresponding to long dimension of the strip or sheet. Alternately, the prepreg layer can be a fabric layer, where the fibers are woven or knit and the fibers are at an oblique angle to the longitudinal axis.
    Type: Grant
    Filed: August 3, 1987
    Date of Patent: November 28, 1989
    Assignee: Allied-Signal Inc.
    Inventors: G. A. Harpell, H. L. Li, Y. D. Kwon, D. C. Prevorsek
  • Patent number: 4820568
    Abstract: The present invention is an improved prepreg layer, multilayer composite based on the improved prepreg layer, and article made from the multilayer composite.The prepreg layer of the present invention comprises an array of at least two adjacent, coplanar fibrous elements. Each element comprises a plurality of unidirectional coplanar fibers embedded in a polymeric matrix. The fibers are up to eight inches, preferably one to eight inches, and more preferably two to six inches long.The prepreg layer of the present invention is useful to make a multilayer composite comprising a plurality of the prepreg layers as recited above. The fibers of adjacent layers are at an angle of about 90.degree. from each other. The composite preferably has 2 to 500, more preferably 10 to 150, and most preferably 60 to 120 layers.
    Type: Grant
    Filed: August 3, 1987
    Date of Patent: April 11, 1989
    Assignee: Allied-Signal Inc.
    Inventors: Gary A. Harpell, H. L. Li, Y. D. Kwon, D. C. Prevorsek