Patents by Inventor David E. Schaaf

David E. Schaaf 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: 4686914
    Abstract: A seed drill has a hoe point operable to create a furrow and a fertilizer feed shank to apply fertilizer in the furrow. A seed tube is operatively positioned behind the hoe point and fertilizer feed shank within the furrow and is vertically adjustable relative to the fertilizer feed shank and hoe point. An adjustable hoe bed provides vertical movement of the hoe points and seed tubes relative to the main frame of the seed drill. An adjustable banding cup adaptor meters the feed of fertilizer to either the fertilizer feed shank or the seed tube. V-shaped packer wheels create V-shaped soil compaction which allows for water retention and plant protection.
    Type: Grant
    Filed: February 11, 1986
    Date of Patent: August 18, 1987
    Assignee: Versatile Corporation
    Inventors: David E. Schaaf, Fransesco M. Jorna