Patents by Inventor Tadashi Tajima

Tadashi Tajima 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: 10316621
    Abstract: A system includes a downhole tool having a first load of a plurality of loads that receive power from a system power supply. The downhole tool includes a second load of the plurality of loads configured to receive power from the system power supply. The downhole tool includes control electronics that control a temporal distribution of power delivered from the system power supply to at least the first and second load such that timing of power drawn by the first load is based on timing of power drawn by the second load.
    Type: Grant
    Filed: December 15, 2016
    Date of Patent: June 11, 2019
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Robert Arthur Adolph, Tadashi Tajima, Julien Tavernier
  • Publication number: 20180171756
    Abstract: A system includes a downhole tool having a first load of a plurality of loads that receive power from a system power supply. The downhole tool includes a second load of the plurality of loads configured to receive power from the system power supply. The downhole tool includes control electronics that control a temporal distribution of power delivered from the system power supply to at least the first and second load such that timing of power drawn by the first load is based on timing of power drawn by the second load.
    Type: Application
    Filed: December 15, 2016
    Publication date: June 21, 2018
    Inventors: Robert Arthur Adolph, Tadashi Tajima, Julien Tavernier
  • Patent number: 9091154
    Abstract: Systems, apparatuses, and methods for hybrid cable telemetry. The methods can include positioning a toolstring in a wellbore. The toolstring can include an uphole telemetry cartridge and a downhole telemetry cartridge respectively adapted to send and receive telemetry data. The toolstring can also include a hybrid logging cable having optical fibers and copper conductors that can operatively couple the uphole telemetry cartridge to the downhole telemetry cartridge. The method can also include transferring data between the uphole telemetry cartridge and the downhole telemetry cartridge across the optical fibers and the copper conductors. The method can further include measuring a data transmission rate on the optical fibers and the copper conductors. The method can also include comparing the data transmission rate to a predetermined threshold. The method can further include detecting a data transmission failure when the data transmission rate falls below the predetermined threshold.
    Type: Grant
    Filed: March 28, 2013
    Date of Patent: July 28, 2015
    Assignee: Schlumberger Technology Corporation
    Inventors: Nalin Weerasinghe, Tadashi Tajima, Motohiro Nakanouchi, David Santoso, Kenji Endo
  • Publication number: 20140292530
    Abstract: Systems, apparatuses, and methods for hybrid cable telemetry. The methods can include positioning a toolstring in a wellbore. The toolstring can include an uphole telemetry cartridge and a downhole telemetry cartridge respectively adapted to send and receive telemetry data. The toolstring can also include a hybrid logging cable having optical fibers and copper conductors that can operatively couple the uphole telemetry cartridge to the downhole telemetry cartridge. The method can also include transferring data between the uphole telemetry cartridge and the downhole telemetry cartridge across the optical fibers and the copper conductors. The method can further include measuring a data transmission rate on the optical fibers and the copper conductors. The method can also include comparing the data transmission rate to a predetermined threshold. The method can further include detecting a data transmission failure when the data transmission rate falls below the predetermined threshold.
    Type: Application
    Filed: March 28, 2013
    Publication date: October 2, 2014
    Applicant: Schlumberger Technology Corporation
    Inventors: Nalin Weerasinghe, Tadashi Tajima, Motohiro Nakanouchi, David Santoso, Kenji Endo
  • Publication number: 20080071014
    Abstract: It is to provide an acrylic rubber composition which provides an acrylic rubber vulcanizate retaining high tensile strength and modulus even if a long-term thermal load is applied and contains no component limited by environmental regulations. The above object is attained by an acrylic rubber composition comprising 100 parts by weight of a carboxyl group-containing acrylic rubber and 0.3 to 8 parts by weight of a styrenated diphenylamine compound, and by an acrylic rubber composition further comprising 0.05 to 20 parts by weight of a crosslinking agent besides the above components.
    Type: Application
    Filed: June 22, 2005
    Publication date: March 20, 2008
    Inventors: Takeshi Ohishi, Tadashi Tajima