Patents by Inventor John Sparapany

John Sparapany 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).

  • Method for dewatering of sludge
    Patent number: 6413433
    Abstract: A process for dewatering of sludge, wherein said sludge comprises solids and water, comprising the steps of: a) adding a cationic dispersion polymer and a microparticle to said sludge, wherein said cationic dispersion polymer can be added before or after or simultaneous with the addition of said microparticle; and b) physically separating said solids from said water.
    Type: Grant
    Filed: August 31, 2000
    Date of Patent: July 2, 2002
    Assignee: Nalco Chemical Company
    Inventors: Elise Maury, Livio Mattucci, Fernando Urbani, Massimo Borelli, John Sparapany