Patents by Inventor Robert W. Christy, Sr.

Robert W. Christy, Sr. 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 pathogen reduction in waste
    Patent number: 5346616
    Abstract: An apparatus for pathogen reduction in waste where dewatered sludge having a solids content in the range of 10-60% is mixed with an additive selected from the group consisting of calcium oxide or calcium carbonate group. Hydration to calcium hydroxide occurs with an attendant release of heat. The pH of the sludge is then elevated and the heat of the hydration reaction is retained resulting in effective neutralization of pathogens.
    Type: Grant
    Filed: November 3, 1992
    Date of Patent: September 13, 1994
    Assignee: RDP Company
    Inventors: Robert W. Christy, Sr., Paul G. Christy
  • Process for pathogen reduction in waste
    Patent number: 5229011
    Abstract: A process for pathogen reduction in waste where dewatered sludge having a solids content in the range of 10-60% is mixed with an additive selected from the group consisting of calcium oxide or calcium carbonate group. Hydration to calcium hydroxide occurs with an attendant release of heat. The pH of the sludge is then elevated and the heat of the hydration reaction is retained resulting in effective neutralization of pathogens.
    Type: Grant
    Filed: November 3, 1992
    Date of Patent: July 20, 1993
    Inventors: Robert W. Christy, Sr., Paul G. Christy
  • Process and apparatus for pathogen reduction in waste
    Patent number: 5013458
    Abstract: A process for pathogen reduction in waste where dewatered sludge having a solids content in the range of 10-60% is mixed with an additive selected from the group consisting of calcium oxide or calcium carbonate group. Hydration to calcium hydroxide occurs with an attendant release of heat. The pH of the sludge is then elevated and the heat of the hydration reaction is retained resulting in effective neutralization of pathogens. Apparatus is also disclosed.
    Type: Grant
    Filed: April 6, 1990
    Date of Patent: May 7, 1991
    Assignee: RDP Company
    Inventors: Robert W. Christy, Sr., Paul G. Christy