Patents by Inventor William J. Stephan

William J. Stephan 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).

  • Soil preparation device
    Patent number: 6295938
    Abstract: The invention is a soil preparation device for use with a planter row unit of the type which includes a front face, a furrow opener to the rear of the front face, a seed dispenser, and a furrow closer to the rear of the furrow opener and seed dispenser.
    Type: Grant
    Filed: February 29, 2000
    Date of Patent: October 2, 2001
    Inventor: William J. Stephan