Patents by Inventor Earl M. Kelly

Earl M. Kelly 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).

  • Sewage treatment system and process
    Patent number: 4271027
    Abstract: The following disclosure teaches ways and means for clarifying raw sewage and thickening secondary sewage sludge. The disclosed apparatus comprises a tank having upper and lower feedwells disposed therein. Raw sewage is introduced into the lower feedwell and flows into the lower part of the tank to be clarified therein, and secondary sludge is aerated and introduced into the upper feedwell so that it flows therefrom and thickens in the upper part of the tank by flotation type thickening.
    Type: Grant
    Filed: April 2, 1979
    Date of Patent: June 2, 1981
    Assignee: Envirotech Corporation
    Inventor: Earl M. Kelly
  • Sludge thickening apparatus and process
    Patent number: 4173534
    Abstract: The following disclosure teaches means for thickening primary and secondary sewage sludge. The disclosed apparatus comprises a tank having upper and lower feedwells disposed therein. Primary sludge is introduced into the lower feedwell and flows into the lower part of the tank to thicken therein. Secondary sludge is aerated and introduced into the upper feedwell so that it flows therefrom and thickens in the upper part of the tank by flotation type thickening.
    Type: Grant
    Filed: December 12, 1977
    Date of Patent: November 6, 1979
    Assignee: Envirotech Corporation
    Inventor: Earl M. Kelly
  • Sludge thickening apparatus
    Patent number: 4082671
    Abstract: The following disclosure teaches means for thickening primary and secondary sewage sludge. The disclosed apparatus comprises a tank having upper and lower feedwells disposed therein. Primary sludge is introduced into the lower feedwell and flows into the lower part of the tank to thicken therein. Secondary sludge is aerated under super atmospheric pressure and introduced into the upper feedwell so that it flows therefrom and thickens in the uppper part of the tank by flotation type thickening.
    Type: Grant
    Filed: September 30, 1976
    Date of Patent: April 4, 1978
    Assignee: Envirotech Corporation
    Inventor: Earl M. Kelly