Patents by Inventor Aloysius G. Roggekamp

Aloysius G. Roggekamp 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).

  • Watertight seal between two concrete elements
    Patent number: 4449720
    Abstract: A watertight seal (1) between two adjoining channel-shaped concrete elements (2) has an elastic sealing strip (3) sandwiched between a socket (5) of one concrete element (2) enveloped by the socket (5). The sealing strip (3) is recessed and has a transverse profile such, that when the socket is slid over the wedge (7), material (12) of the sealing strip (3) shifts in a direction contrary to movement of the socket in order to prevent damage of the sealing strip.
    Type: Grant
    Filed: November 17, 1981
    Date of Patent: May 22, 1984
    Assignees: Ballast-Nedam Groep N.V., Waco Beton B.V.
    Inventors: Tjako A. Wolters, Aloysius G. Roggekamp