Patents by Inventor Darleen A. Druyun

Darleen A. Druyun 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).

  • Low pressure process for continuous fiber reinforced polyamic acid resin matrix composite laminates
    Patent number: 5312579
    Abstract: A low pressure process was developed for preparing a well-consolidated polyimide composite laminate. Prepreg plies were formed from unidirectional fibers and a polyamic acid resin solution. Molding stops were placed at the sides of a matched metal die mold. The prepreg plies were cut shorter than the length of the mold in the in-plane lateral direction and were stacked between the molding stops to a height which was higher than the molding stops. The plies were then compressed to the height of the stops and heated to allow the volatiles to escape and to start the imidization reaction. After removing the stops from the mold, the heat was increased and 0-500 p.s.i. pressure was applied to complete the imidization reaction. The heat and pressure were further increased to form a consolidated polyimide composite laminate.
    Type: Grant
    Filed: July 30, 1992
    Date of Patent: May 17, 1994
    Assignee: The United States of America as represented by the United States National eronautics and Space Administration
    Inventors: Darleen A. Druyun, Tan-Hung Hou, Paul W. Kidder, Rakasi M. Reddy, Robert M. Baucom