Patents by Inventor Takehiko Iritani

Takehiko Iritani 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).

  • Lubricant composition and magnetic recording medium using the same
    Patent number: 6187724
    Abstract: A lubricant composition comprising (A) a compound of the formula: R1—COO—R2 wherein R1 is a higher aliphatic hydrocarbon residue and R2 is an aliphatic hydrocarbon residue which may contain fluorine atom(s) and/or oxygen atom(s), and (B) a compound of the formula: wherein R3 is a higher aliphatic hydrocarbon residue; R4 and R5 are independently a hydrogen atom or an aliphatic hydrocarbon residue which may contain fluorine atom(s) and/or oxygen atom(s), gives a lubricant layer in a magnetic recording medium having good running durability, still life and weather resistance.
    Type: Grant
    Filed: September 28, 1998
    Date of Patent: February 13, 2001
    Assignees: Wako Pure Chemical Industries, Ltd., TDK Corporation
    Inventors: Tsunehiko Ikarashi, Koji Kobayashi, Hiromichi Kanazawa, Takahiro Hayashi, Takehiko Iritani
  • Process for producing N,N-disubstituted p-phenylenediamine derivative sulfate
    Patent number: 5475140
    Abstract: 4-Amino-3-methyl-N-ethyl-N-(.beta.-hydroxyethyl)-aniline sulfate which is used particularly as a developer for color photography can be easily produced in high yield and high quality by nitrosating N-ethyl-N-(.beta.-hydroxyethyl)-m-toluidine by use of an alkyl nitrite in a homogeneous alcohol solution containing sulfuric acid in an amount of about 0.5 to about 1 mole per mole of N-ethyl-N-(.beta.-hydroxyethyl)-m-toluidine, and then reducing the nitrosation product in an aqueous alcohol solution after or without isolation of the nitrosation product.
    Type: Grant
    Filed: April 19, 1994
    Date of Patent: December 12, 1995
    Assignee: Wako Pure Chemical Industries, Ltd.
    Inventors: Takehiko Iritani, Ryohiko Kinoshita, Yoshiki Kametani