Patents by Inventor Shota HIRAKAWA

Shota HIRAKAWA 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
    Patent number: 11352583
    Abstract: Provided is a lubricating oil composition comprising a base oil (A) containing a polyalkylene glycol (A1) and a polyol ester (A2), a phosphorus-based rust inhibitor (B), and an antioxidant (C) containing an amine-based antioxidant (C1). The lubricating oil composition exhibits a strong effect for suppressing sludge sedimentation even when used for an extended period of time in a high-temperature environment, and has excellent demulsibility and rust preventive properties, and therefore, can be suitably used in turbomachinery, compressors, hydraulic equipment, and machine tools.
    Type: Grant
    Filed: August 7, 2017
    Date of Patent: June 7, 2022
    Assignee: IDEMITSU KOSAN CO., LTD.
    Inventors: Shinji Aoki, Shota Hirakawa
  • LUBRICANT COMPOSITION
    Publication number: 20190177648
    Abstract: Provided is a lubricating oil composition comprising a base oil (A) containing a polyalkylene glycol (A1) and a polyol ester (A2), a phosphorus-based rust inhibitor (B), and an antioxidant (C) containing an amine-based antioxidant (C1). The lubricating oil composition exhibits a strong effect for suppressing sludge sedimentation even when used for an extended period of time in a high-temperature environment, and has excellent demulsibility and rust preventive properties, and therefore, can be suitably used in turbomachinery, compressors, hydraulic equipment, and machine tools.
    Type: Application
    Filed: August 7, 2017
    Publication date: June 13, 2019
    Applicant: IDEMITSU KOSAN CO., LTD.
    Inventors: Shinji AOKI, Shota HIRAKAWA