Patents Represented by Attorney, Agent or Law Firm Mark A. Hagedorn
  • Patent number: 6369104
    Abstract: A microbial inhibiting composition and method are disclosed. The composition comprises an amount, effective for the intended purpose, of glutaraldehyde and 2,2-dibromo-3-nitrilopropionamide. The method comprises administering between about 0.1 and 200 parts of this combined treatment (based on one million parts of the desired aqueous system) to the particular water containing system for which treatment is desired.
    Type: Grant
    Filed: July 17, 2000
    Date of Patent: April 9, 2002
    Assignee: Hercules Incorporated
    Inventors: Lynn G. Kleina, Wilson K. Whitekettle
  • Patent number: 6228217
    Abstract: This invention is directed to a process for preparing an aqueous papermaking suspension containing a polyelectrolyte complex comprising providing an aqueous suspension of pulp fibers containing a water-soluble cationic polymer and a water-soluble anionic polymer that are reactable in the aqueous suspension to form the polyelectrolyte complex, and a multivalent cation having at least a +3 charge, and forming the polyelectrolyte complex. It also includes the process wherein the aqueous suspension of pulp fibers contains surface active carboxyl compounds and water-soluble anionic compounds. It further includes the process wherein the aqueous papermaking suspension is sheeted and dried to obtain paper of improved strength.
    Type: Grant
    Filed: January 13, 1995
    Date of Patent: May 8, 2001
    Assignee: Hercules Incorporated
    Inventors: Jay A. Dickerson, Harry J. Goldy, Douglas C. Smith, Ronald R. Staib