Patents by Inventor Kazunori Shirai

Kazunori Shirai 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).

  • Perfluoropolyether compound, and lubricant and magnetic disk each using the same
    Patent number: 8039132
    Abstract: A compound of the formula (I), and lubricant, and magnetic disk each using the same A-(CH2—Rf—CH2O—B—O)n—CH2—Rf—CH2-A??(I) wherein n is an integer of 1 to 4, A is a group of the formula (a) below, and B is a group of the formula (b) below, p being 1 or 2, R being C1-4 fluoroalkyl, Rf is —CF2O(CF2CF2O)x(CF2O)yCF2— or —CF2CF2O(CF2CF2CF2O)zCF2CF2—, x, y and z being each a real number of 0 to 50.
    Type: Grant
    Filed: May 9, 2008
    Date of Patent: October 18, 2011
    Assignee: Moresco Corporation
    Inventors: Tsuyoshi Shimizu, Kazunori Shirai, Nagayoshi Kobayashi
  • Perfluoropolyether compound, and lubricant and magnetic disk each using the same
    Publication number: 20100136371
    Abstract: A compound of the formula (I), and lubricant, and magnetic disk each using the same A-(CH2—Rf—CH2O—B—O)n—CH2—Rf—CH2-A??(I) wherein n is an integer of 1 to 4, A is a group of the formula (a) below, and B is a group of the formula (b) below, p being 1 or 2, R being C1-4 fluoroalkyl, Rf is —CF2O(CF2CF2O)x(CF2O)yCF2— or —CF2CF2O(CF2CF2CF2O)nCF2CF2—, x, y and z being each a real number of 0 to 50.
    Type: Application
    Filed: May 9, 2008
    Publication date: June 3, 2010
    Inventors: Tsuyoshi Shimizu, Kazunori Shirai, Nagayoshi Kobayashi