Patents by Inventor Kwok-Lun Ho

Kwok-Lun Ho 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).

  • Patent number: 6039775
    Abstract: An abrasive article is provided which includes a peripheral surface formed comprising a grinding aid. The grinding aid is formed from a mixture including an acid and at least one of an inorganic metal phosphate salt or an inorganic metal sulfate salt. The acid is preferably selected so that the mixture forms a film. The abrasive article preferably has sharp abrasive particles. The inventive abrasive article improves grinding efficacy, particularly in titanium grinding processes, as compared to abrasive articles that are substantially devoid of a grinding aid of the present invention. Also provided is a method for making an abrasive article and a method of abrading a surface with an abrasive article.
    Type: Grant
    Filed: October 6, 1998
    Date of Patent: March 21, 2000
    Assignee: 3M Innovative Properties Company
    Inventors: Kwok-Lun Ho, Robert A. Follensbee, Walter L. Harmer, Mary L. Morris
  • Patent number: 5958794
    Abstract: A method of modifying an exposed surface of a semiconductor wafer that includes the steps of:(a) contacting the surface with a fixed abrasive article having a three-dimensional textured abrasive surface that includes a plurality of abrasive particles and a binder in the form of a pre-determined pattern; and(b) relatively moving the wafer and the fixed abrasive article to modify said surface of the wafer.
    Type: Grant
    Filed: August 8, 1996
    Date of Patent: September 28, 1999
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Wesley J. Bruxvoort, Scott R. Culler, Kwok-Lun Ho, David A. Kaisaki, Carl R. Kessel, Thomas P. Klun, Heather K. Kranz, Robert P. Messner, Richard J. Webb, Julia P. Williams
  • Patent number: 5840090
    Abstract: A coated abrasive article comprised of a backing having a layer of grains adherently bonded thereto by a binding material, wherein the layer of grains comprises abrasive grains and nonabrasive composite grains, and the nonabrasive composite grains comprise inorganic nonabrasive particles bonded together by a binder selected from the group consisting of a metal salt of fatty acid, colloidal silica, and combinations thereof. The abrasive article has an unexpected abrading efficiency, performing equal to, or superior to, a coated abrasive article containing only abrasive grains. The invention also relates to a bonded abrasive article comprising the abrasive grains and nonabrasive composite grains adhered together.
    Type: Grant
    Filed: September 15, 1997
    Date of Patent: November 24, 1998
    Assignee: Minnesota Mining and Manufacturing
    Inventors: Kwok-Lun Ho, Walter L. Harmer
  • Patent number: 5738695
    Abstract: An abrasive article, and methods of making and using same, comprising an inorganic phosphate selected from the group consisting of an alkali metal metaphosphate, an alkaline earth metal metaphosphate, and a Group IIIA metal orthophosphate; the inorganic phosphate may be present in a peripheral coating layer of a coated abrasive article, or an abrasive slurry coating in a uniform thickness, or a structured abrasive article.
    Type: Grant
    Filed: February 6, 1997
    Date of Patent: April 14, 1998
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Walter L. Harmer, Kwok-Lun Ho
  • Patent number: 5702811
    Abstract: A coated abrasive article comprised of a backing having a layer of grains adherently bonded thereto by a binding material, wherein the layer of grains comprises abrasive grains and nonabrasive composite grains, and the nonabrasive composite grains comprise inorganic nonabrasive particles bonded together by a binder selected from the group consisting of a metal salt of fatty acid, colloidal silica, and combinations thereof. The abrasive article has an unexpected abrading efficiency, performing equal to, or superior to, a coated abrasive article containing only abrasive grains. The invention also relates to a bonded abrasive article comprising the abrasive grains and nonabrasive composite grains adhered together.
    Type: Grant
    Filed: October 20, 1995
    Date of Patent: December 30, 1997
    Inventors: Kwok-Lun Ho, Walter L. Harmer
  • Patent number: 5551962
    Abstract: Abrasive articles are described that include a plurality of abrasive particles, a plurality of coated grinding aid particles, the coated grinding aid particles comprising grinding aid particles coated with an inert, hydrophobic, hydrocarbon-containing substance, and a binder in which the abrasive particles and the coated grinding aid particles are dispersed.
    Type: Grant
    Filed: January 23, 1996
    Date of Patent: September 3, 1996
    Assignee: Minnesota Mining Manufacturing Company
    Inventor: Kwok-Lun Ho
  • Patent number: 5552225
    Abstract: Grinding aid particles coated with an inert, hydrophobic, hydrocarbon-containing substance such as fatty acids, fatty acid salts, and oils, and erodible agglomerates comprising a plurality of the coated grinding aid particles are disclosed.
    Type: Grant
    Filed: November 17, 1995
    Date of Patent: September 3, 1996
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Kwok-Lun Ho