Patents by Inventor Takenori TATSUMI

Takenori TATSUMI 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).

  • Viscosity index improver and lubricating oil composition
    Patent number: 9683195
    Abstract: The present invention aims to provide a viscosity index improver excellent in shear stability and having a low HTHS viscosity and a high viscosity index. The viscosity index improver of the present invention contains a (co)polymer (A) containing a polyolefin-based monomer as an essential monomer unit, and a base oil, wherein the absolute value of difference in solubility parameter between the (co)polymer (A) and the base oil is 0.8 to 2.0 (cal/cm3)1/2.
    Type: Grant
    Filed: February 25, 2015
    Date of Patent: June 20, 2017
    Assignee: SANYO CHEMICAL INDUSTRIES, LTD.
    Inventors: Shigekuni Nakada, Ayumu Sakaguchi, Takenori Tatsumi, Hiroki Yamashita
  • VISCOSITY INDEX IMPROVER AND LUBRICATING OIL COMPOSITION
    Publication number: 20170009177
    Abstract: The present invention aims to provide a viscosity index improver excellent in shear stability and having a low HTHS viscosity and a high viscosity index. The viscosity index improver of the present invention contains a (co)polymer (A) containing a polyolefin-based monomer as an essential monomer unit, and a base oil, wherein the absolute value of difference in solubility parameter between the (co)polymer (A) and the base oil is 0.8 to 2.0 (cal/cm3)1/2.
    Type: Application
    Filed: February 25, 2015
    Publication date: January 12, 2017
    Applicant: SANYO CHEMICAL INDUSTRIES, LTD.
    Inventors: Shigekuni NAKADA, Ayumu SAKAGUCHI, Takenori TATSUMI, Hiroki YAMASHITA