Patents by Inventor Samuel C. Sofia

Samuel C. Sofia 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 paper
    Patent number: 4795531
    Abstract: A method of enhancing the dewatering of paper during the papermaking process which includes adding a low molecular weight cationic coagulant and then colloidal silica and a high molecular weight flocculant.
    Type: Grant
    Filed: September 22, 1987
    Date of Patent: January 3, 1989
    Assignee: Nalco Chemical Company
    Inventors: Samuel C. Sofia, Kerrie A. Johnson, Marla S. Crill, Martin J. Roop, Steven R. Gotberg, Anthony S. Nigrelli, Laurence S. Hutchinson