Patents Represented by Attorney Paul A. Greeley

Find this attorney in the Justia Lawyer Directory

  • Treatment of pulp and paper wastewater with reducing agent and a polymer for color removal
    Patent number: 5326479
    Abstract: A process for removing color from a pulp and paper wastewater which comprises the following steps: (a) treating the wastewater with a reducing agent which is capable of inactivating color producing functional groups of the wastewater; and (b) treating the wastewater subsequent to step (a) with a polymer which is capable of removing color from the wastewater.
    Type: Grant
    Filed: September 1, 1993
    Date of Patent: July 5, 1994
    Assignee: Nalco Chemical Company
    Inventors: Jawed M. Sarkar, Amy M. Tseng, John H. Collins