Patents Examined by Sue Hollanbeck
  • Impregnation method for transformation of transition alumina to a alpha alumina
    Patent number: 5139978
    Abstract: The method of the present invention is useful in preparing an improved alpha alumina-based ceramic. The improvement consists of the addition of a precursor of an alpha phase nucleating to transition alumina. The method is particularly useful in preparing alpha alumina-based abrasive grain.
    Type: Grant
    Filed: July 16, 1990
    Date of Patent: August 18, 1992
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Thomas E. Wood