Patents by Inventor Jeffrey M. Douglas

Jeffrey M. Douglas 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).

  • Method of treating municipal sewage sludge and product produced thereby
    Patent number: 5143481
    Abstract: The invention relates to a method of utilizing sewage sludge to form a stablized sterile or pasteurized material which can be used as fertilizer, as fill for land development, or as a cover in solid-waste disposal applications. Fluidized bed combustion residue, fly ash, or FBCR and fly ash are added directly to the sewage sludge exothermic heat is released and the mixture is cured in order to eliminate bacterial and other pathogenic agents. The mixture has a soil-like consistancy, making it spreadable. The mixture has both the nutritive benefits of sewage sludge as a fertilizer and alkalinity for treatment of overly acidic soil.
    Type: Grant
    Filed: April 18, 1991
    Date of Patent: September 1, 1992
    Assignee: American Fly Ash Company
    Inventors: Glenn O. Schumacher, LaVerne Weber, Mitchell Nowicki, Alan Dunbar, Jeffrey M. Douglas
  • Method of treating municipal sewage sludge and product produced thereby
    Patent number: 5051031
    Abstract: The invention relates to a method of utilizing sewage sludge to form a stabilized sterile or pasteurized material which can be used as fertilizer, as fill for land development, or as a cover in solid-waste disposal applications. Fluidized bed combustion residue, fly ash, or FBCR and fly ash are added directly to the sewage sludge exothermic heat is released and the mixture is cured in order to eliminate bacterial and other pathogenic agents. The mixture has a soil-like consistency, making it spreadable. The mixture has both the nutritive benefits of sewage sludge as a fertilizer and alkalinity for treatment of overly acidic soil.
    Type: Grant
    Filed: September 11, 1989
    Date of Patent: September 24, 1991
    Assignee: American Fly Ash Company
    Inventors: Glenn O. Schumacher, LaVerne Weber, Mitchell Nowicki, Alan Dunbar, Jeffrey M. Douglas