Patents by Inventor Douglas F Porter

Douglas F Porter 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).

  • Ballast water de-toxification treatment system for ships
    Patent number: 6221262
    Abstract: Method for reducing the number of viable organisms present in ship ballast water wherein the ballast water is treated so as to reduce the concentration of dissolved oxygen and/or carbon dioxide to a level(s) at which a substantial portion of the organisms present cease to remain viable. The treatment comprises adding to the ballast water a suitable amount of an antioxidant.
    Type: Grant
    Filed: November 18, 1998
    Date of Patent: April 24, 2001
    Inventors: Robert W. G. MacDonald, Robert Bull, Douglas F Porter, Peter Lansell
  • Temporary protective cover for an electrical outlet box
    Patent number: D345142
    Type: Grant
    Filed: July 9, 1992
    Date of Patent: March 15, 1994
    Inventor: Douglas F. Porter