Patents by Inventor Terrance W. Duffy

Terrance W. Duffy 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).

  • Directed cracking in concrete panel manufacture
    Patent number: 4416842
    Abstract: A method of manufacture in which the formation of unsightly stress cracks in sandwich-like panels of prestressed concrete are prevented by the formation of a "contraction joint" at selected locations in the panel's outer layer of concrete during its manufacture.
    Type: Grant
    Filed: March 2, 1981
    Date of Patent: November 22, 1983
    Assignee: Fabcon, Inc.
    Inventors: Richard C. Nash, Terrance W. Duffy