Patents by Inventor Stephanie L. Kwolek

Stephanie L. Kwolek 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: 4608427
    Abstract: An improved process for preparing polybenzobisthiazoles and polybenzobisoxazoles involves reacting diethyl, di-n-propyl, diisopropyl or diisobutyl terephthalate rather than terephthalic acid with the appropriate dihydrochloride.
    Type: Grant
    Filed: June 20, 1985
    Date of Patent: August 26, 1986
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Wilfred Sweeny, Stephanie L. Kwolek
  • Patent number: RE30352
    Abstract: Compositions or dopes comprising carbocyclic aromatic polyamides in suitable liquid media are prepared which are optically anisotropic (exhibit different light transmission properties in different directions in the dope). These dopes, and related isotropic dopes, are used in preparing fibers of unique internal structure (evidenced by low orientation angle and/or high sonic velocity) and exceptionally high tensile properties (e.g., initial modulus).
    Type: Grant
    Filed: October 12, 1978
    Date of Patent: July 29, 1980
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Stephanie L. Kwolek