Patents by Inventor Ronald L. Schlitzer

Ronald L. Schlitzer 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).

  • Use of bis-amines to enhance the antimicrobial activity of aqueous compositions
    Patent number: 7871602
    Abstract: The use of bis-amines to enhance the antimicrobial activity of pharmaceutical compositions is described. The bis-amines are particularly useful for enhancing the antimicrobial activity of aqueous ophthalmic compositions, such as artificial tears or ocular lubricants, and solutions for disinfecting contact lenses.
    Type: Grant
    Filed: October 3, 2008
    Date of Patent: January 18, 2011
    Assignee: Alcon, Inc.
    Inventors: Nissanke L. Dassanayake, Thomas Christopher Carey, Ronald L. Schlitzer, David L. Meadows
  • N-HALAMINE FORMULATIONS WITH ENHANCED ANTIMICROBIAL ACTIVITY
    Publication number: 20100303930
    Abstract: The present invention relates to antimicrobial formulations comprising an N-halamine and a quantity of sodium chlorite sufficient to enhance the antimicrobial efficacy of the N-halamine. The present invention is further directed to formulations for disinfecting a contact lens comprising an N-halamine and a quantity of sodium chlorite sufficient to enhance the antimicrobial efficacy of the N-halamine.
    Type: Application
    Filed: May 28, 2010
    Publication date: December 2, 2010
    Applicant: ALCON RESEARCH, LTD.
    Inventors: Thomas Christopher Carey, Nissanke L. Dassanayake, Ronald L. Schlitzer, Howard Allen Ketelson
  • USE OF BIS-AMINES TO ENHANCE THE ANTIMICROBIAL ACTIVITY OF AQUEOUS COMPOSITIONS
    Publication number: 20090030085
    Abstract: The use of bis-amines to enhance the antimicrobial activity of pharmaceutical compositions is described. The bis-amines are particularly useful for enhancing the antimicrobial activity of aqueous ophthalmic compositions, such as artificial tears or ocular lubricants, and solutions for disinfecting contact lenses.
    Type: Application
    Filed: October 3, 2008
    Publication date: January 29, 2009
    Applicant: ALCON, INC.
    Inventors: Nissanke L. Dassanayake, Thomas Christopher Carey, Ronald L. Schlitzer, David L. Meadows
  • Use of bis-amines to enhance the antimicrobial activity of aqueous compositions
    Patent number: 7445771
    Abstract: The use of bis-amines to enhance the antimicrobial activity of pharmaceutical compositions is described. The bis-amines are particularly useful for enhancing the antimicrobial activity of aqueous ophthalmic compositions, such as artificial tears or ocular lubricants, and solutions for disinfecting contact lenses.
    Type: Grant
    Filed: December 9, 2004
    Date of Patent: November 4, 2008
    Assignee: Alcon, Inc.
    Inventors: Nissanke L. Dassanayake, Thomas Christopher Carey, Ronald L. Schlitzer, David L. Meadows
  • Use of amidoamines to treat or prevent acanthamoeba and fungal infections
    Patent number: 7025958
    Abstract: The use of amidoamines to treat or prevent infections attributable to Acanthamoeba and fungi is described. The amidoamines are highly effective against both Acanthamoeba and fungi, and are less toxic to delicate tissues that may become infected with these types of microorganisms (e.g., the cornea).
    Type: Grant
    Filed: November 27, 2001
    Date of Patent: April 11, 2006
    Assignee: Alcon, Inc.
    Inventors: Ronald L. Schlitzer, Nissanke L. Dassanayake, Ruth Ann Rosenthal, Sally L. Buck
  • Alkylpolypropyleneoxide amidotriamines and method of using same
    Patent number: 6962693
    Abstract: Alkylpolypropyleneoxide amidotriamines having antimicrobial activity are described. The compounds are useful as antimicrobial preservatives in various types of pharmaceutical compositions. Ophthalmic compositions containing these compounds as disinfecting agents or preservatives are also described.
    Type: Grant
    Filed: November 30, 2004
    Date of Patent: November 8, 2005
    Assignee: Alcon, Inc.
    Inventors: Nissanke L. Dassanayake, Ronald L. Schlitzer
  • Aminobiguanides and the use thereof to disinfect contact lenses and preserve pharmaceutical compositions
    Patent number: 6916958
    Abstract: Aminobiguanides and the use of same as antimicrobial agents in pharmaceutical compositions are disclosed. The aminobiguanides are useful in the preservation of pharmaceutical compositions, particularly ophthalmic pharmaceutical compositions and compositions for treating contact lenses. The compounds are especially useful for disinfecting contact lenses.
    Type: Grant
    Filed: September 26, 2003
    Date of Patent: July 12, 2005
    Assignee: Alcon Manufacturing, Ltd.
    Inventors: Joonsup Park, Nissanke L. Dassanayake, Nathaniel D. McQueen, Ronald L. Schlitzer
  • Aminobiguanides and the use thereof to disinfect contact lenses and preserve pharmaceutical compositions
    Publication number: 20040063791
    Abstract: Aminobiguanides and the use of same as antimicrobial agents in pharmaceutical compositions are disclosed. The aminobiguanides are useful in the preservation of pharmaceutical compositions, particularly ophthalmic pharmaceutical compositions and compositions for treating contact lenses. The compounds are especially useful for disinfecting contact lenses.
    Type: Application
    Filed: September 26, 2003
    Publication date: April 1, 2004
    Inventors: Joonsup Park, Nissanke L. Dassanayake, Nathaniel D. McQueen, Ronald L. Schlitzer
  • Use of amidoamines to treat or prevent acanthamoeba and fungal infections
    Publication number: 20040058924
    Abstract: The use of amidoamines to treat or prevent infections attributable to Acanthamoeba and fungi is described. The amidoamines are highly effective against both Acanthamoeba and fungi, and are less toxic to delicate tissues that may become infected with these types of microorganisms (e.g., the cornea).
    Type: Application
    Filed: April 30, 2003
    Publication date: March 25, 2004
    Inventors: Ronald L. Schlitzer, Nissanke L. Dassanayake, Ruth Ann Rosenthal, Sally L. Buck
  • Aminobiguanides and the use thereof to disinfect contact lenses and preserve pharmaceutical compositions
    Patent number: 6664294
    Abstract: Aminobiguanides and the use of same as antimicrobial agents in pharmaceutical compositions are disclosed. The aminobiguanides are useful in the preservation of pharmaceutical compositions, particularly ophthalmic pharmaceutical compositions and compositions for treating contact lenses. The compounds are especially useful for disinfecting contact lenses.
    Type: Grant
    Filed: August 3, 2000
    Date of Patent: December 16, 2003
    Assignee: Alcon Manufacturing, Ltd.
    Inventors: Joonsup Park, Nissanke L. Dassanayake, Nathaniel D. McQueen, Ronald L. Schlitzer
  • Use of diamines to disinfect and clean contact lenses and preserve ophthalmic compositions
    Patent number: 5900213
    Abstract: N,N-dialkyl and N'-alkylethylene diamines of the formula: ##STR1## wherein R, R.sup.1 and R.sup.2 are as described in the specification. The compounds are useful in disinfecting and cleaning contact lenses and preserving ophthalmic products.
    Type: Grant
    Filed: March 25, 1998
    Date of Patent: May 4, 1999
    Assignee: Alcon Laboratories, Inc.
    Inventors: Nissanke L. Dassanayake, Ronald L. Schlitzer, Joonsup Park, Bahram Asgharian
  • Use of amidoamines in ophthalmic compositions
    Patent number: 5631005
    Abstract: The use of certain amidoamines to disinfect contact lenses and preserve ophthalmic compositions is described. Ophthalmic compositions containing these compounds as disinfecting agents or preservatives are also described. The amidoamines utilized in the present invention have potent antibacterial and antifungal activity, and are chemically compatible with inorganic ions and other materials utilized in ophthalmic compositions.
    Type: Grant
    Filed: February 24, 1995
    Date of Patent: May 20, 1997
    Assignee: Alcon Laboratories, Inc.
    Inventors: Nissanke L. Dassanayake, Ronald L. Schlitzer, Joonsup Park
  • Use of diamines in ophthalmic compositions
    Patent number: 5627214
    Abstract: Certain alkenyl diamines, the use of same for disinfecting and cleaning contact lenses and preserving ophthalmic products, and associated ophthalmic compositions are described.
    Type: Grant
    Filed: February 16, 1995
    Date of Patent: May 6, 1997
    Assignee: Alcon Laboratories, Inc.
    Inventors: Rolf Schafer, Ronald L. Schlitzer, Nissanke L. Dassanayake
  • Double redox system for disinfecting contact lenses
    Patent number: 5591397
    Abstract: An improved method for rapid disinfection of contact lenses in a convenient and reliable manner is disclosed in which a series of oxidation-reduction reactions are employed. Specifically, dichloroisocyanurate and potassium iodide react to form iodine species for disinfecting the contact lens. An amount of ascorbate is then added to neutralize the iodine species.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: January 7, 1997
    Assignee: Alcon Laboratories, Inc.
    Inventors: Ronald L. Schlitzer, N. L. Dassanayake, Rajkumar P. Bhatia
  • Use of amidoamines in ophthalmic compositions
    Patent number: 5573726
    Abstract: The use of certain amidoamines to disinfect contact lenses and preserve ophthalmic compositions is described, Ophthalmic compositions containing these compounds as disinfecting agents or preservatives are also described, The amidoamines utilized in the present invention have potent antibacterial and antifungal activity, and are chemically compatible with inorganic ions and other materials utilized in ophthalmic compositions.
    Type: Grant
    Filed: February 27, 1995
    Date of Patent: November 12, 1996
    Assignee: Alcon Laboratories, Inc.
    Inventors: Nissanke L. Dassanayake, Ronald L. Schlitzer, Joonsup Park
  • Double redox system for disinfecting contact lenses
    Patent number: 5462713
    Abstract: An improved method for rapid disinfection of contact lenses in a convenient and reliable manner is disclosed in which a series of oxidation-reduction reactions are employed. Specifically, dicheoroisocyanurate and potassium iodide react to form iodine species for disinfecting the contact lens. An amount of ascorbate is then added to neutralize the iodine species.
    Type: Grant
    Filed: August 16, 1993
    Date of Patent: October 31, 1995
    Assignee: Alcon Laboratories, Inc.
    Inventors: Ronald L. Schlitzer, N. L. Dassanayake, Rajkumar P. Bhatia
  • Use of diamines to disinfect and clean contact lenses
    Patent number: 5415837
    Abstract: Certain alkenyl diamines, the use of same for disinfecting and cleaning contact lenses and preserving ophthalmic products, and associated ophthalmic compositions are described.
    Type: Grant
    Filed: October 25, 1993
    Date of Patent: May 16, 1995
    Assignee: Alcon Laboratories, Inc.
    Inventors: Rolf Schafer, Ronald L. Schlitzer, Nissanke L. Dassanayake
  • Use of amidoamines in ophthalmic compositions
    Patent number: 5393491
    Abstract: Certain amidoamines, the use of same for disinfecting and cleaning contact lenses and preserving ophthalmic products, and associated ophthalmic compositions are described.
    Type: Grant
    Filed: September 22, 1993
    Date of Patent: February 28, 1995
    Assignee: Alcon Laboratories, Inc.
    Inventors: Nissanke L. Dassanayake, Ronald L. Schlitzer, Joonsup Park