Patents by Inventor Philip G. Sweeny

Philip G. Sweeny 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 removal of biofilm
    Patent number: 7407590
    Abstract: The present invention provides a method for the removal of biofilm, flocculent bulked sludge or bulked biologically active sludge from an aqueous system. The method involves adding one or more chlorinated hydantoins, such as dichloro- or monochlorodialkylhydantoin, to the aqueous system. Alternatively, the chlorinated hydantoin may be formed in situ by adding a chlorine source and an alkylated hydantoin separately to the aqueous system. The invention is particularly advantageous because of the outstanding photostability of the chlorinated hydantoin solutions even when exposed to sunlight.
    Type: Grant
    Filed: June 6, 2003
    Date of Patent: August 5, 2008
    Assignee: Lonza, Inc.
    Inventors: Michael Ludensky, Philip G. Sweeny
  • Hydantoin-enhanced halogen efficacy in pulp and paper applications
    Patent number: 5565109
    Abstract: Free halogen sources (e.g., sodium hypochlorite and chlorine) added as slimicides in high organic component process streams such as pulp and paper processing are rendered more efficacious by the addition of selected N-hydrogen compounds (namely, 5,5-dimethylhydantoin, 5-ethyl-5-methylhydantoin, cyanuric acid, succinimide, urea, 4,4-dimethyl-2-oxazolidinone, and glycouril) to the process stream. The latter compounds may be added to the process stream before or after the slimicide is added or combined with the slimicide and added directly thereto. The direct use of halogenated hydantoins has also been found to provide improved efficacy relative to free halogen sources. In addition, absorbable organic halogen by-products are reduced.
    Type: Grant
    Filed: October 14, 1994
    Date of Patent: October 15, 1996
    Assignee: Lonza Inc.
    Inventor: Philip G. Sweeny
  • Polyglycerol antifoam agents in paper processing
    Patent number: 5429718
    Abstract: Polyglycerol esters have been found to be effective antifoam agents in aqueous systems employed in paper processing. Adjunct antifoam agents are not required. Best results are obtained with polyglycerol esters having a degree of glycerine polymerization in the range of 3 to 6 and an esterification range of 15 to 85%.
    Type: Grant
    Filed: November 12, 1993
    Date of Patent: July 4, 1995
    Assignee: Lonza Inc.
    Inventors: Nancy M. Morlino, Philip G. Sweeny, Brian D. Curham
  • Hydantoin-enhanced halogen efficacy in pulp and paper applications
    Patent number: RE39021
    Abstract: Free halogen sources (e.g., sodium hypochlorite and chlorine) added as slimicides in high organic component process streams such as pulp and paper processing are rendered more efficacious by the addition of selected N-hydrogen compounds (namely, 5,5-dimethylhydantoin, 5-ethyl-5-methylhydantoin, cyanuric acid, succinimide, urea, 4,4-dimethyl-2-oxazolidinone, and glycouril) to the process stream. The latter compounds may be added to the process stream before or after the slimicide is added or combined with the slimicide and added directly thereto. The direct use of halogenated hydantoins has also been found to provide improved efficacy relative to free halogen sources. In addition, absorbable organic halogen by-products are reduced.
    Type: Grant
    Filed: January 10, 2002
    Date of Patent: March 21, 2006
    Assignee: Lonza Inc.
    Inventor: Philip G. Sweeny