Patents by Inventor Henry A. Larmie

Henry A. Larmie 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).

  • Abrasive grain comprising manganese oxide
    Patent number: 5690707
    Abstract: Abrasive grain including manganese oxide therein are provided. The inclusion of manganese oxide can be utilized to reduce the transition temperature of transitional alumina(s) to alpha alumina(s), during the formation of the abrasive grain. Further, manganese oxide presence can be utilized to generate sintered abrasive grain having a submicrometer, faceted microstructure. The abrasive grain are useful in abrasive articles such as coated abrasives, three-dimensional, low density abrasives, and bonded abrasives.
    Type: Grant
    Filed: June 2, 1995
    Date of Patent: November 25, 1997
    Assignee: Minnesota Mining & Manufacturing Company
    Inventors: William P. Wood, Henry A. Larmie
  • Abrasive grain containing alumina and zirconia
    Patent number: 5551963
    Abstract: A method of preparing preferred abrasive grain includes: preparing a dispersion including alpha alumina oxide monohydrate and zirconia sol therein; converting the dispersion to base grit material; and sintering the base grit to form abrasive grains. The presence of the zirconia sol within the dispersion from which the base grits are formed provides an improved abrasive grain. The improved abrasive grain are useful in abrasive products.
    Type: Grant
    Filed: November 6, 1995
    Date of Patent: September 3, 1996
    Assignee: Minnesota Mining and Manufacturing Co.
    Inventor: Henry A. Larmie
  • Abrasive grain having rare earth oxide therein
    Patent number: 5498269
    Abstract: A preferred abrasive grain comprises a sintered product of a precursor material comprising alumina, zirconia, and rare earth oxide. The preferred abrasive grain has an average hardness of at least about 21 GPa and an average toughness of at least about 4 MPa.multidot.m.sup.1/2. A method of preparing preferred abrasive grain is provided. The improved abrasive grain are useful in abrasive products.
    Type: Grant
    Filed: May 26, 1995
    Date of Patent: March 12, 1996
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Henry A. Larmie
  • Method for making abrasive grain containing alumina and ceria
    Patent number: 5429647
    Abstract: A method of preparing abrasive grain includes: preparing a dispersion including alpha alumina oxide monohydrate and ceria sol therein; converting the dispersion to base grit material; and sintering the base grit to form abrasive grains. The grain are useful in abrasive products.
    Type: Grant
    Filed: January 13, 1994
    Date of Patent: July 4, 1995
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Henry A. Larmie