Patents by Inventor Bruce A. Poltrock

Bruce A. Poltrock 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).

  • Scraper device for an agricultural implement
    Patent number: 4858699
    Abstract: A scraper device for clearing earth and other materials accumulated on ground working elements, such as discs of a plough. The scraper device is suspended from the frame and is free to swing toward the ground working element. When a layer of earth or other material has accumulated on the element, a blade on the device will engage the layer and bite into it, thereby removing the layer as rotation of the element continues. After the layer has been removed, the blade swings away from the element.
    Type: Grant
    Filed: January 21, 1987
    Date of Patent: August 22, 1989
    Assignee: Grizzly Engineering Pty. Ltd.
    Inventor: Bruce A. Poltrock