Patents by Inventor Frederick Spruce

Frederick Spruce 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).

  • Water treatment system
    Patent number: 7029578
    Abstract: A system suitable for the elimination of Cryptosporidium oocysts from water includes a filter bed comprising four layers of inert particulate material such that, from the top layer (first layer) to the bottom layer (fourth layer), the coarseness of the particles decreases while the density of the particulate material increases.
    Type: Grant
    Filed: November 1, 2001
    Date of Patent: April 18, 2006
    Assignee: Spruce International Separations
    Inventor: Frederick Spruce
  • Water treatment system
    Publication number: 20040129653
    Abstract: A system suitable for the elimination of Cryptosporidium oocysts from water includes a filter bed comprising four layers of inert particulate material such that, from the top layer (first layer) to the bottom layer (fourth layer), the coarseness of the particles decreases while the density of the particulate material increases.
    Type: Application
    Filed: February 11, 2004
    Publication date: July 8, 2004
    Inventor: Frederick Spruce