Patents by Inventor Clark R. Zehnder

Clark R. Zehnder 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).

  • Semi-tubular rivets and method of using
    Patent number: 4221041
    Abstract: A rivet for joining fiber reinforced plastic laminates has an alloy of titanium columbium. The rivet is semi-tubular in shape. The tubular portion is shaped with an outwardly tapered inner wall to provide for expansion of the tubular section without expanding the balance of the shank.
    Type: Grant
    Filed: October 2, 1978
    Date of Patent: September 9, 1980
    Assignee: Boeing Commercial Airplane Company
    Inventors: Gerhart Hufnagl, Clark R. Zehnder