Patents by Inventor Hellmuth Costard

Hellmuth Costard 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).

  • Lightweight constructional element of sandwich structure
    Patent number: 5028469
    Abstract: The lightweight constructional element of a sandwich structure having two cover plates comprises a honeycomb structure arranged between the cover plates which holds the cover plates spaced from each other. The honeycomb structure is formed by empty cans, especially used beverage cans, placed side by side whose axes are at right angles to the cover plates and which are arranged in a close packed or a rectangular array. The cans may be attached by adhesive to form a low cost lightweight and strong array.
    Type: Grant
    Filed: June 6, 1989
    Date of Patent: July 2, 1991
    Inventor: Hellmuth Costard