Patents by Inventor Cornelis J. Steketee

Cornelis J. 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).

  • Patent number: 4232743
    Abstract: A device for digging up tuberous plants, for example beets, comprising pairs of lifting members formed by driven shafts slanting towards one another and being provided at the lower ends with lifting bodies, wherein each lifting body has a pressing face extending, viewed in an axial direction, along a helically curved line relative to the rotary axis, such, that the lifting body will gradually penetrate into the soil owing to the helical shape while the quantity of earth sticking to the beet is materially reduced and consequently the tare of the dug-up beet or tuber is considerably reduced as well as the cleaning expenses for the user.
    Type: Grant
    Filed: February 8, 1979
    Date of Patent: November 11, 1980
    Assignee: Vandenende B.V.
    Inventor: Cornelis J. Steketee
  • Patent number: 4193728
    Abstract: The invention relates to a device for collecting and lifting groups of straw bales comprising a frame and members arranged beneath said frame for gripping the straw bales, said gripping members being formed by rods, spaced apart from and parallel to one another and adapted to move towards and away from one another in a direction transverse of the rods, in a manner such that straw bales dispersed on the field can be picked up one by one and be collected into groups for further transport.
    Type: Grant
    Filed: October 25, 1977
    Date of Patent: March 18, 1980
    Inventor: Cornelis J. Steketee