Patents by Inventor Hardy M. Sundberg

Hardy M. Sundberg 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).

  • Apparatus for treating waste matter
    Patent number: 4170797
    Abstract: The disclosure relates to a method and apparatus for treating waste matter in aerobic digestion apparatuses, such as closets. In the method a frother means is disposed in the circulation path of the liquid between the pump and the receptacle means, the frother means being arranged to convert a portion of the liquid to froth for the purposes of accommodating matter particles in the wall of the froth bubbles, the froth being at least to a certain extent supplied to the aerobic digestion compartment.
    Type: Grant
    Filed: July 22, 1977
    Date of Patent: October 16, 1979
    Inventor: Hardy M. Sundberg