Patents by Inventor David A. Zelle

David A. Zelle 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).

  • Device for securing railroad tracks for train sets
    Patent number: 5779145
    Abstract: A track connector for connecting two adjoining pieces of a toy railroad track set. The track connector has arms which extend to accommodate tracks of differing size.
    Type: Grant
    Filed: November 6, 1996
    Date of Patent: July 14, 1998
    Inventors: David A. Zelle, Jill J. T. Zelle