Patents by Inventor David L. Koon

David L. Koon 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).

  • Protective device for roll stands and the like
    Patent number: 4170121
    Abstract: A protective device for preventing a machine, such as a reversing roll stand, from receiving a new workpiece unless the machine has been reset after the previous workpiece leaves. The device includes an electronic circuit which is set automatically when the previous workpiece leaves and is reset when the machine is reset. In the example of a roll stand, the circuit permits a reverse pass and another forward pass even though the stand is not reset.
    Type: Grant
    Filed: May 11, 1978
    Date of Patent: October 9, 1979
    Assignee: United States Steel Corporation
    Inventor: David L. Koon