Patents by Inventor Adolf Unterwaditzer

Adolf Unterwaditzer 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).

  • Device for draining sandy ground areas
    Patent number: 4386873
    Abstract: A device for draining sandy ground areas, such as tennis-courts, includes an air pump, water separating elements and a suction device. A suction pipe connects the pump to the water separating elements and the water separating means to the suction device. In order to prevent sand from being removed from the ground during the draining process, the suction device has a relatively large inlet is covered by an open-pore, elastic foam plastics material.
    Type: Grant
    Filed: December 18, 1980
    Date of Patent: June 7, 1983
    Inventors: Franz Messner, Adolf Unterwaditzer