Patents by Inventor Heinrich B. Schafers

Heinrich B. Schafers 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).

  • Dowel
    Patent number: 4028988
    Abstract: A dowel for use in concrete and lightweight building bricks and boards is disclosed. The dowel comprises pressure elements, a spreading element for the pressure elements and a threaded bolt surrounded by a head element. The head element, and preferably the pressure elements and/or the spreading element are made from artificial stone, such as a fine-textured concrete or ceramic material.
    Type: Grant
    Filed: January 13, 1976
    Date of Patent: June 14, 1977
    Inventor: Heinrich B. Schafers