Patents by Inventor Cornelius Jan Steketee

Cornelius Jan Steketee 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).

  • Ground working implement
    Patent number: 4091878
    Abstract: An agricultural implement for pulverizing the top layer of the soil. It comprises a positively coupled pair of rollers rolling over the ground at unequal surface speeds so that at least one of the rollers is constantly slipping. A harrow is mounted in front of each roller. The assembly of rollers and harrows is pressed onto the ground by a rod comprising a built-in compression spring, which may be adjustable. Each roller is composed of a set of longitudinal strips mounted on an axle.
    Type: Grant
    Filed: January 30, 1976
    Date of Patent: May 30, 1978
    Assignee: P. J. Zweegers end Zonen Landbouwmachinefabriek B.V.
    Inventor: Cornelius Jan Steketee