Patents by Inventor Tatsuya HAMACHI

Tatsuya HAMACHI 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).

  • Patent number: 10844311
    Abstract: Provided are a lubricating oil composition containing a mineral oil (1) having a kinematic viscosity at 100° C. of 2 mm2/s or more and less than 2.5 mm2/s, and a polymethacrylate (2) having a functional group containing an oxygen atom in the molecule while having a specific structural, unit, which satisfies both high viscosity index and high shear stability, and a lubrication method and a transmission using the lubricating oil composition.
    Type: Grant
    Filed: March 2, 2017
    Date of Patent: November 24, 2020
    Assignee: IDEMITSU KOSAN CO., LTD.
    Inventor: Tatsuya Hamachi
  • Patent number: 10815445
    Abstract: Provided are a lubricating oil composition containing a synthetic oil (1) having a kinematic viscosity at 100° C. of 2.5 mm2/s or less, and a polymethacrylate (2) having a monovalent functional group containing an oxygen atom in the molecule while having a specific structural unit, which satisfies both high viscosity index and high shear stability, and a lubrication method and a transmission using the lubricating oil composition.
    Type: Grant
    Filed: March 2, 2017
    Date of Patent: October 27, 2020
    Assignee: IDEMITSU KOSAN CO., LTD.
    Inventor: Tatsuya Hamachi
  • Publication number: 20200332216
    Abstract: Provided are a lubricating oil composition containing a mineral oil (1) having a kinematic viscosity at 100° C. of 2.5 mm2/s or more and 5 mm2/s or less, and a polymethacrylate (2) having a functional group containing an oxygen atom in the molecule while having a specific structural unit, which satisfies both high viscosity index and high shear stability, and a lubrication method and a transmission using the lubricating oil composition.
    Type: Application
    Filed: March 2, 2017
    Publication date: October 22, 2020
    Applicant: IDEMITSU KOSAN CO., LTD
    Inventor: Tatsuya HAMACHI
  • Publication number: 20200172824
    Abstract: Provided is a lubricating oil composition for a shock absorber, the lubricating oil composition being capable of emitting fluorescence by ultraviolet irradiation while ensuring thermal stability and abrasion resistance. This lubricating oil composition for a shock absorber contains, as components: (A) a base oil; (B) a hydrocarbon compound having a stilbene structure; and (C) a phosphite ester.
    Type: Application
    Filed: November 7, 2018
    Publication date: June 4, 2020
    Applicant: Idemitsu Kosan Co.,Ltd.
    Inventors: Shuichi SAKANOUE, Tatsuya HAMACHI
  • Publication number: 20190284498
    Abstract: To provide a lubricating oil composition having excellent viscosity characteristics and a property of difficulty in evaporation, which contains a base oil having a kinematic viscosity at 40° C. of 4.0 mm2/s or more and less than 6.0 mm2/s, a kinematic viscosity at 100° C. of 1.0 mm2/s or more and less than 2.0 mm2/s and a flash point of 140° C. or more, and a viscosity index improver, and has a Brookfield viscosity at ?40° C. of 750 mPa·s or less, a kinematic viscosity at 60° C. of 5.5 mm2/s or more, and a NOACK value at 145° C. for 1 hour of 10% by mass or less.
    Type: Application
    Filed: November 17, 2017
    Publication date: September 19, 2019
    Applicant: IDEMITSU KOSAN CO., LTD.
    Inventors: Shuichi SAKANOUE, Tatsuya HAMACHI
  • Publication number: 20190233756
    Abstract: A lubricating oil composition for industrial machines containing a base oil (A) and a specific acylglycerol (B) and having excellent brake squeal preventing performance, and a lubrication method using the composition.
    Type: Application
    Filed: August 1, 2017
    Publication date: August 1, 2019
    Applicant: IDEMITSU KOSAN CO., LTD.
    Inventor: Tatsuya HAMACHI
  • Publication number: 20190173772
    Abstract: A method of monitoring includes transmitting, by a computer, a polling signal to a first communication apparatus, receiving, from the first communication apparatus, information on a first notification target which is detected in the first communication apparatus and first interval information indicative of a difference between timing at which the first notification item is detected and timing at which the polling signal is received in the first communication apparatus, and determining, based on first time information indicative of timing at which polling is performed and the first interval information, a time sequence of the first notification target and a second notification target which is detected in a second communication apparatus.
    Type: Application
    Filed: November 28, 2018
    Publication date: June 6, 2019
    Applicant: FUJITSU LIMITED
    Inventors: Tatsuya Hamachi, Kenichi Ohyama, Yushi Nobayashi
  • Publication number: 20190119604
    Abstract: Provided are a lubricating oil composition for shock absorber, containing a base oil and a comb polymer having a mass average molecular weight of 5×104 or more and 1×106 or less, which has a high viscosity index and provides a shock absorber capable of keeping a damping force thereof substantially constant at any temperature and exhibiting excellent damping force characteristics; a method of producing the lubricating oil composition for shock absorber; a damping method; and a shock absorber.
    Type: Application
    Filed: April 5, 2017
    Publication date: April 25, 2019
    Applicant: IDEMITSU KOSAN CO., LTD.
    Inventors: Shuichi SAKANOUE, Tatsuya HAMACHI
  • Publication number: 20190112541
    Abstract: Provided are a lubricating oil composition containing a synthetic oil (1) having a kinematic viscosity at 100° C. of 2.5 mm2/s or less, and a polymethacrylate (2) having a monovalent functional group containing an oxygen atom in the molecule while having a specific structural unit, which satisfies both high viscosity index and high shear stability, and a lubrication method and a transmission using the lubricating oil composition.
    Type: Application
    Filed: March 2, 2017
    Publication date: April 18, 2019
    Applicant: IDEMITSU KOSAN CO., LTD.
    Inventor: Tatsuya HAMACHI
  • Publication number: 20190085258
    Abstract: Provided are a lubricating oil composition containing a mineral oil (1) having a kinematic viscosity at 100° C. of 2 mm2/s or more and less than 2.5 mm2/s, and a polymethacrylate (2) having a functional group containing an oxygen atom in the molecule while having a specific structural, unit, which satisfies both high viscosity index and high shear stability, and a lubrication method and a transmission using the lubricating oil composition.
    Type: Application
    Filed: March 2, 2017
    Publication date: March 21, 2019
    Applicant: IDEMITSU KOSAN CO., LTD.
    Inventor: Tatsuya HAMACHI