Patents by Inventor Johannes Luhrmann

Johannes Luhrmann 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: 4694759
    Abstract: A seed drill for applying seed and/or fertilizer has a frame, reservoir, and sowing shares. The sowing shares are attached to the frame in such a way that they can move in an upright plane by means of superimposed and at least approximately parallel struts on parallelogram mounts. To essentially improve the share mounts, allowing them to be employed on direct-sowing seed drills and especially on soils thickly set with entrenched stones or other obstacles and preventing damage to the shares or share mounts when the shares are laterally overstressed, at least one strut on a parallelogram mount is elastic.
    Type: Grant
    Filed: August 15, 1985
    Date of Patent: September 22, 1987
    Assignee: Amazonen Werke H. Dreyer GmbH & Co. KG
    Inventors: Heinz Dreyer, Bernd Scheufler, Benno Wiemeyer, Johannes Luhrmann