Patents by Inventor John A. Dufay

John A. Dufay 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).

  • Constructed wetlands remediation system
    Patent number: 6159371
    Abstract: Constructed wetlands, utilizing a plurality of cells, in which nitrification and denitrification occurs simultaneously, at low flow rates and lower temperatures. The constructed wetlands provides improved remediation in a shorter period of time.
    Type: Grant
    Filed: May 29, 1998
    Date of Patent: December 12, 2000
    Assignee: Albuquerque Public Schools District No. 12
    Inventor: John A. Dufay