Patents by Inventor Alexander D. Fisher

Alexander D. Fisher 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).

  • Slurry distribution device for chemical mechanical polishing
    Patent number: 11986926
    Abstract: An apparatus for chemical mechanical polishing includes a rotatable platen having a surface to support a polishing pad, a carrier head to hold a substrate in contact with the polishing pad, and a polishing liquid distribution system. The polishing liquid distribution system includes a dispenser positioned to deliver a polishing liquid to a portion of a polishing surface of the polishing pad, and a curved barrier positioned after the dispenser to spread fresh polishing liquid from the dispenser.
    Type: Grant
    Filed: August 26, 2022
    Date of Patent: May 21, 2024
    Assignee: Applied Materials, Inc.
    Inventors: Yen-Chu Yang, Stephen Jew, Jianshe Tang, Haosheng Wu, Shou-Sung Chang, Paul D. Butterfield, Alexander John Fisher, Bum Jick Kim
  • 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