Patents by Inventor Philip C. Rogers

Philip C. Rogers 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).

  • Treatment for phosphorus-containing waste material
    Patent number: 4481176
    Abstract: The invention is directed to a process for recovering elemental phosphorus values from phosphorus-containing waste materials. The process comprises reducing the size of the solid particulate materials of the sludge and forming a uniform homogenous sludge which is filtered through a high-pressure thin-cake filter resulting in a filtrate high in phosphorus values.The invention also discloses a pump retrieval means for retrieving the sludge from contaminated disposal areas and a preconditioning dewatering means for thickening and clarifying the sludge prior to comminuting the solids contained therein and filtrating to recover the phosphorus values contained therein.
    Type: Grant
    Filed: October 3, 1983
    Date of Patent: November 6, 1984
    Assignee: Stauffer Chemical Company
    Inventors: David L. Dodson, Bruce D. Pate, Philip C. Rogers