Patents by Inventor Gerwin Holtmann

Gerwin Holtmann 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).

  • Method and device for removing used refractory lining and/or slag deposits from elongated vessels
    Patent number: 4328959
    Abstract: An apparatus and method for removing used refractory lining or slag or both from the inner wall of an elongated vessel. The apparatus includes a cutting disc movably mounted on a guide mechanism which may be fixably located within the vessel. In accordance with the inventive technique, one or more recesses is formed within the lining extending from the surface thereof to the wall of the vessel.
    Type: Grant
    Filed: November 14, 1980
    Date of Patent: May 11, 1982
    Inventor: Gerwin Holtmann