Patents by Inventor Tjeerd G. Wiersma

Tjeerd G. Wiersma 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).

  • Lifting plate furnace
    Patent number: 4256454
    Abstract: A furnace having a flue through which plates bearing products to be fired are advanced. A plurality of rams are mounted below the plates for lifting the plates off of supports in the flue. A mechanism is also provided to move the rams parallel to the direction of advance. To advance the products along the flue, the rams lift the plates. The rams are then advanced in a forward direction, after which the plates are lowered onto a flue supports. The rams are then returned to their original position and the cycle is repeated.
    Type: Grant
    Filed: July 12, 1979
    Date of Patent: March 17, 1981
    Assignee: Smit Ovens Nijmegen BV
    Inventor: Tjeerd G. Wiersma