Patents by Inventor John C. Schrader

John C. Schrader 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).

  • Process for reducing the sulfate concentration in a wastewater stream
    Patent number: 9085477
    Abstract: A method of reducing a sulfate concentration in wastewater comprises directing the wastewater stream to a precipitation reactor and mixing the wastewater stream with a calcium source and a calcium salt seed material to precipitate calcium sulfate. The precipitated calcium sulfate is then separated from a treated effluent and directed to a settling tank where the precipitated calcium sulfate is separated into heavier calcium sulfate precipitants and lighter calcium sulfate precipitants. The heavier calcium sulfate precipitants and the lighter calcium sulfate precipitants are separately recirculated to the precipitation reactor. A predetermined mass ratio of solids is maintained in the precipitation reactor.
    Type: Grant
    Filed: June 23, 2011
    Date of Patent: July 21, 2015
    Assignee: Veolia Water Solutions & Technologies Support
    Inventors: Kashi Banerjee, Charles D. Blumenschein, Robert G. Cook, John C. Schrader
  • Process for Reducing the Sulfate Concentration in a Wastewater Stream
    Publication number: 20120160770
    Abstract: A method of reducing a sulfate concentration in wastewater comprises directing the wastewater stream to a precipitation reactor and mixing the wastewater stream with a calcium source and a calcium salt seed material to precipitate calcium sulfate. The precipitated calcium sulfate is then separated from a treated effluent and directed to a settling tank where the precipitated calcium sulfate is separated into heavier calcium sulfate precipitants and lighter calcium sulfate precipitants. The heavier calcium sulfate precipitants and the lighter calcium sulfate precipitants are separately recirculated to the precipitation reactor. A predetermined mass ratio of solids is maintained in the precipitation reactor.
    Type: Application
    Filed: June 23, 2011
    Publication date: June 28, 2012
    Applicant: VEOLIA WATER SOLUTIONS & TECHNOLOGIES SUPPORT
    Inventors: Kashi Banerjee, Charles D. Blumenschein, Robert G. Cook, John C. Schrader