Patents by Inventor William E. Oostendorp

William E. Oostendorp 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: 5649413
    Abstract: A combination grass trimming and lawn edging device operatively connectable to the rotary output shaft of a power lawn trimmer. The device includes a support member which defines a preferably circular perimeter and includes a central mounting hole for operable driven connection with the output shaft. Two independent cutting means are provided, the first being a plurality of evenly spaced rigid blades which are each pivotally connected to the support member and, when operable with the output shaft being generally horizontal, radially extend beyond the perimeter for lawn edging. Another plurality of elongated flexible filament lines are each operably connectable by engagement with one end of each thereof with evenly spaced aperture structure of the support member to provide the second cutting means. When in use with the output shaft upright, the filament lines are for cutting and trimming grass.
    Type: Grant
    Filed: November 14, 1995
    Date of Patent: July 22, 1997
    Inventor: William E. Oostendorp
  • Patent number: 5493783
    Abstract: A grass trimming device for removal of grass which overgrows a concrete doughnut positioned on the ground surrounding a sprinkler head of an underground lawn sprinkler system. The device is connectable to a lawn trimmer having a rotating upright output shaft and includes a horizontal support member having a cylindrical strengthening and protecting ring which defines an outer circular perimeter of the device. The device also includes a plurality of freely rotatably mounted cutting blade members connected and downwardly extending from a lower surface of the support member by a threaded bolt, shaft or the like. Each blade member has an inverted L-shape with the horizontal leg thereof rotatably mounted by the bolt to the support member.
    Type: Grant
    Filed: May 23, 1994
    Date of Patent: February 27, 1996
    Inventor: William E. Oostendorp