Patents by Inventor Hans-Hugo Spelsberg

Hans-Hugo Spelsberg 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).

  • Filling for percolating filters for biological waste water purification
    Patent number: 4451362
    Abstract: A filling for a percolating filter for biological purification of waste water includes a plurality of flexible, irregularly touching, randomly arranged plastic strips up to 8 cm in width and several meters in length twisted together and suspended from a support over the height of the filter tank. The strips may have a maximum thickness of 30-100 .mu.m and a minimum thickness of 10-60 .mu.m, varying in such thicknesses over their width. The strips may be residue edge portion cuttings severed from the production of continuously produced sheet materials.
    Type: Grant
    Filed: February 17, 1983
    Date of Patent: May 29, 1984
    Assignee: Felix Schoeller, Jr., GmbH & Co., KG
    Inventor: Hans-Hugo Spelsberg