Patents by Inventor Perry Schafer

Perry Schafer 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 for treating raw sludge including a simultaneous or pulsed aerobic/anoxic digestion process
    Patent number: 7833415
    Abstract: An improved process for sludge treatment includes anaerobic digestion followed by post-mesophilic aerobic and/or anoxic digestion. The first anaerobic step may be performed under either mesophilic or thermophilic conditions. The subsequent aerobic/anoxic digestion may be performed using either simultaneous, sequential or pulsed aerobic and anoxic conditions. An apparatus for performing the improved sludge treatment may be one digester for performing the anaerobic followed by aerobic/anoxic digestion. Alternatively, the system for performing the improved sludge treatment techniques may be at least two digest reactors.
    Type: Grant
    Filed: October 25, 2006
    Date of Patent: November 16, 2010
    Assignee: D.C. Water & Sewer Authority
    Inventors: Sudhir N. Murthy, John T. Novak, Walter F. Bailey, Jr., Glen T. Daigger, Perry Schafer, Christopher Peot
  • Apparatus and method using a simultaneous, sequential or pulsed aerobic and/or anoxic digestion process
    Publication number: 20070102353
    Abstract: An improved process for sludge treatment includes anaerobic digestion followed by post-mesophilic aerobic and/or anoxic digestion. The first anaerobic step may be performed under either mesophilic or thermophilic conditions. The subsequent aerobic/anoxic digestion may be performed using either simultaneous, sequential or pulsed aerobic and anoxic conditions. An apparatus for performing the improved sludge treatment may be one digester for performing the anaerobic followed by aerobic/anoxic digestion. Alternatively, the system for performing the improved sludge treatment techniques may be at least two digest reactors.
    Type: Application
    Filed: October 25, 2006
    Publication date: May 10, 2007
    Inventors: Sudhir Murthy, John Novak, Walter Bailey, Glen Daigger, Perry Schafer, Christopher Peot