Patents by Inventor Leslie E. Letterman

Leslie E. Letterman 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: 4622091
    Abstract: A method and apparatus for creating monolithic structures formed of fiber reinforced resin composites, i.e., layers or plies bonded together by a cured resin is disclosed. A plurality of dry plies (13, 15, 17, 19) are stacked to create a dry preform (11). The orientation of the plies is based on the desired directional strength of the resulting structure. The plies may or may not be stitched in the cross-ply direction, as desired. After the dry preform (11) is created, one or more layers of liquid or solid resin (21) are added. The dry preform and the resin layer(s), which are located atop a forming tool (33), are enclosed by resin content control envelope (35) through which breather tape (49) passes. The resin content control envelope (35) is, in turn, enclosed by a vacuum envelope (37). First air and other gases are withdrawn and, then, the composite is heated, causing the resin to flow into the dry preform (11).
    Type: Grant
    Filed: November 29, 1984
    Date of Patent: November 11, 1986
    Assignee: The Boeing Company
    Inventor: Leslie E. Letterman