Patents by Inventor Michail G. Evstatiev

Michail G. Evstatiev 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).

  • Preparation of high-modulus, high-strength linear polycondensates
    Patent number: 4842789
    Abstract: Described and claimed is a process for obtaining high-modulus, high-strength linear polycondensates, e.g., polyamides, comprising the sequential steps drawing at room temperature, isothermal annealing at 180.degree.-270.degree. C., a second drawing at room temperature, and a second isothermal annealing at 120.degree.-260.degree. C., an orientation degree after the second drawing being 20-25.
    Type: Grant
    Filed: June 23, 1988
    Date of Patent: June 27, 1989
    Assignee: University of Delaware
    Inventors: Michail G. Evstatiev, Stoyko C. Fakirov, Jerold M. Schultz