Patents by Inventor Yoshinobu Fujii

Yoshinobu Fujii 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 using same
    Publication number: 20060052262
    Abstract: A compound of the formula (I), a lubricant and a magnetic disk using the compound A—CH2CF2O(CF2CF2O)m-(CF2O)n-CF2CH2—B ??(I) wherein A is amino group having hydroxyl group, B is hydroxyl group, or amino group having or not having hydroxyl group, wherein m is a real number of 5 to 36, and n is a real number of from 4 to 30.
    Type: Application
    Filed: October 1, 2003
    Publication date: March 9, 2006
    Applicant: MATSUMURA OIL RESEARCH CORP.
    Inventors: Tamio Akada, Nagayoshi Kobayashi, Yoshinobu Fujii
  • Phosphazene compounds and lubricants containing the same
    Patent number: 6608009
    Abstract: A phosphazene compound of the formula (1) or (5) which has an arrangement such that perfluoroxyalkylene units selected from —CF2O— and —CF2CF2O— are randomly distributed, the compound having a functional terminal group A or group G A—OCH2CF2O(CF2CF2O)p(CF2O)qCF2CH2O—A  (1) G—[OCH2CF2O(CF2CF2O)p(CF2O)qCF2CH2OH]6-z  (5) wherein A is a group of the formula (a) and G is a group of the formula (g) shown in the specification, and a lubricant containing at least one of the phosphazene compounds of the formulas (1) and (5).
    Type: Grant
    Filed: March 20, 2002
    Date of Patent: August 19, 2003
    Assignee: Matsumura Oil Research Corp.
    Inventors: Tamio Akada, Yoshinobu Fujii, Nagayoshi Kobayashi, Rie Fujimoto
  • Lubricant for magnetic recording medium
    Patent number: 6541431
    Abstract: The present invention provides a lubricant for magnetic recording medium which comprises, as an effective component, a phosphazene compound of formula [N═P[O(C6H4)—(A)z—R]a[OCH2—(B)xH]b]y  (1) wherein A is —C6H4— or —OC6H4—, B is fluorine-containing alkylene group, R is hydrogen atom, fluorine atom, C1-4 alkyl, C1-4 alkoxy or C1-4 haloalkyl, a and b are a real number of 0 to 2, satisfying a+b=2, x is 1, 2, 3 or 4, y is 3 or 4, and z is 0 or 1.
    Type: Grant
    Filed: January 22, 2001
    Date of Patent: April 1, 2003
    Assignee: Matsumura Oil Research Corp.
    Inventors: Tamio Akada, Yoshinobu Fujii, Nagayoshi Kobayashi, Rie Fujimoto
  • Phosphazene compounds and lubricants containing the same
    Publication number: 20020183211
    Abstract: A phosphazene compound of the formula (1) or (5) which has an arrangement such that perfluoroxyalkylene units selected from —CF2O— and —CF2CF2O— are randomly distributed, the compound having a functional terminal group A or group G
    Type: Application
    Filed: March 20, 2002
    Publication date: December 5, 2002
    Inventors: Tamio Akada, Yoshinobu Fujii, Nagayoshi Kobayashi, Rie Fujimoto