Patents by Inventor Ben B. Christophersen

Ben B. Christophersen 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).

  • Head gate for pen confining structure
    Patent number: 4304195
    Abstract: A head gate for pen confining structures is disclosed. The head gate utilizes two synchronized gates with a gap there between. When the animal enters the gate, the gap is lodged in its open position. As the animal moves forward, the neck of the animal fits between the gap of the closing gates and rotates the gates forward and shuts. After the gates have closed, the animal cannot remove his head for the gates are held in position by a stop mechanism.
    Type: Grant
    Filed: April 4, 1980
    Date of Patent: December 8, 1981
    Inventor: Ben B. Christophersen