Patents by Inventor Douglas K. Schroeder

Douglas K. Schroeder 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).

  • Pneumatic material handling system for combines
    Patent number: 4441511
    Abstract: A pneumatic system for harvesting combines which is operable for pneumatically transferring clean grain to the grain tank and for pneumatically conveying the tailings to the threshing cylinder. The pneumatic system includes a clean grain collection tube and a tailings collection tube, each of which is provided with an airlock device which permits grain or tailings to be metered into the pneumatic system while preventing air or grain from escaping therefrom.
    Type: Grant
    Filed: March 22, 1982
    Date of Patent: April 10, 1984
    Inventor: Douglas K. Schroeder