The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 17, 1994
Filed:
Jul. 30, 1992
Darleen A Druyun, Washington, DC (US);
Tan-Hung Hou, Poquoson, VA (US);
Paul W Kidder, East Falmouth, MA (US);
Rakasi M Reddy, Yorktown, VA (US);
Robert M Baucom, Newport News, VA (US);
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.