Patents by Inventor Kuniharu Yamamoto

Kuniharu Yamamoto 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).

  • Lubricating oil composition for sliding guide surface
    Patent number: 11098263
    Abstract: A lubricating oil composition for a sliding guide surface, which includes a lubricant base oil, an acid phosphate ester mixture having a structure represented by the following Formula (1) and including an acid phosphate monoester and an acid phosphate diester, and an aliphatic monoamine, and which satisfies a predetermined condition A or condition B, is provided. In Formula (1), each of R1 and R2 represents a hydrogen atom or a saturated or unsaturated straight-chain aliphatic hydrocarbon group having from 1 to 30 carbon atoms, and R1 and R2 are not simultaneously hydrogen atoms.
    Type: Grant
    Filed: September 25, 2017
    Date of Patent: August 24, 2021
    Assignee: Cosmo Oil Lubricants Co., Ltd.
    Inventors: Kuniharu Yamamoto, Masaaki Kondo, Kenichi Sekine
  • Lubricating Oil Composition for Sliding Guide Surface
    Publication number: 20190300816
    Abstract: A lubricating oil composition for a sliding guide surface, which includes a lubricant base oil, an acid phosphate ester mixture having a structure represented by the following Formula (1) and including an acid phosphate monoester and an acid phosphate diester, and an aliphatic monoamine, and which satisfies a predetermined condition A or condition B, is provided. In Formula (1), each of R1 and R2 represents a hydrogen atom or a saturated or unsaturated straight-chain aliphatic hydrocarbon group having from 1 to 30 carbon atoms, and R1 and R2 are not simultaneously hydrogen atoms.
    Type: Application
    Filed: September 25, 2017
    Publication date: October 3, 2019
    Inventors: Kuniharu Yamamoto, Masaaki Kondo, Kenichi Sekine