Patents by Inventor Leif Zetterlund

Leif Zetterlund 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).

  • Scraping device in a settling basin
    Patent number: 4724088
    Abstract: The present invention relates to a scraping device in a settling basin. The scraping device removes sediments, which accumulate on the bottom of the basin. It comprises a vehicle and a scraper on the vehicle. A cable drive device having a pull cable pulls the vehicle forwards and backwards along the bottom of the basin. The scraper assumes, in one of the vehicle's two directions of movement, a working position, in which it is directed towards the bottom of the basin, in order to scrape sediments to an output area, and in the vehicle's opposite direction a passive return position, in which it is elevated from the bottom of the basin.
    Type: Grant
    Filed: September 24, 1986
    Date of Patent: February 9, 1988
    Inventor: Leif Zetterlund