Patents by Inventor Davor F. Zidovec

Davor F. Zidovec 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).

  • Control of barium sulfate scaling
    Patent number: 6620328
    Abstract: This invention relates to a method of inhibiting the growth of barium sulfate scaling by using a synergistic blend of (a) a polyphosphate with degree of polymerization between 6 and 21, and (b) a polyphosphate with degree of polymerization of 2-3 in a weight ratio of 3:1 to 1:2. The blend further includes a phosphino-acrylic polymer.
    Type: Grant
    Filed: April 5, 2002
    Date of Patent: September 16, 2003
    Assignee: Ashland Inc.
    Inventor: Davor F. Zidovec
  • Control of barium sulfate scaling
    Publication number: 20020153506
    Abstract: This invention relates to a method of inhibiting the growth of barium sulfate scaling by using a synergistic blend of (a) a polyphosphate with degree of polymerization between 6 and 21, and (b) a polyphosphate with degree of polymerization of 2-3.
    Type: Application
    Filed: April 5, 2002
    Publication date: October 24, 2002
    Applicant: Ashland, Inc.
    Inventor: Davor F. Zidovec
  • Calcium carbonate scale controlling method
    Patent number: 5562830
    Abstract: A method of inhibiting corrosion and scale formation and deposition in aqueous systems by adding a combination of a polyepoxysuccinic acid or salts thereof and a phosphonocarboxylic acid or salts thereof.
    Type: Grant
    Filed: September 14, 1995
    Date of Patent: October 8, 1996
    Assignee: Betz Laboratories, Inc.
    Inventors: Davor F. Zidovec, Preetha M. Prabhu
  • Methods of controlling scale formation in the presence of metal ions in aqueous systems
    Patent number: 5468393
    Abstract: A method of inhibiting scale formation in acidic aqueous systems where metal ions such as Al.sup.+3 and Fe.sup.+3 are present by employing a polyepoxysuccinic acid in combination with a metal ion binding material.
    Type: Grant
    Filed: October 20, 1994
    Date of Patent: November 21, 1995
    Assignee: Betz PaperChem, Inc.
    Inventors: Davor F. Zidovec, Alexander D. Fisher, deceased
  • Methods of controlling scale formation in the presence of metal ions in aqueous systems
    Patent number: 5368740
    Abstract: A method of inhibiting scale formation in acidic aqueous systems where metal ions such as A1.sup.+3 or Fe.sup.+3 are present by employing a polyepoxysuccinic acid in combination with a metal ion binding material.
    Type: Grant
    Filed: April 23, 1993
    Date of Patent: November 29, 1994
    Assignee: Betz PaperChem, Inc.
    Inventors: Davor F. Zidovec, Alexander D. Fisher
  • Method of inhibiting calcium oxalate scale deposition
    Patent number: 5320757
    Abstract: Hydrolyzed copolymers (A) maleic anhydride with (B) at least one more ethylenically unsaturated monomer other than acrylic acid or methacrylic acid or with a mixture of (B) and (C) acrylic acid or methacrylic acid are employed in a process to inhibit calcium oxalate formation and deposition.
    Type: Grant
    Filed: April 5, 1993
    Date of Patent: June 14, 1994
    Assignee: Betz Laboratories, Inc.
    Inventors: Davor F. Zidovec, Alexander D. Fisher
  • Methods for inhibiting barium sulfate deposition using a poly(amine)compound or its salts in papermaking systems
    Patent number: 5256253
    Abstract: The present invention provides for methods of inhibiting the formation and deposition of barium sulfate on the surfaces of papermaking systems. The inventive treatments comprise adding an effective amount of a poly(amine) compound to the papermaking systems. Representative polymers include polyallylamine, polytrimethylallylammonium chloride and polyvinylamine.
    Type: Grant
    Filed: August 24, 1992
    Date of Patent: October 26, 1993
    Assignee: Betz PaperChem Inc.
    Inventors: Davor F. Zidovec, Alexander D. Fisher, David D. Dreisbach