Patents by Inventor Yasuaki SAKAI

Yasuaki SAKAI 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).

  • Publication number: 20200040246
    Abstract: Provided is a coolant composition having not only excellent antifreeze properties and insulation properties but also improved cooling performance.
    Type: Application
    Filed: July 3, 2019
    Publication date: February 6, 2020
    Inventors: Hiroyuki ARAI, Yasuaki KODAMA, Masayuki NAGASAWA, Tsutomu SAKAI, Hironori SHIRAISHI, Yasumi TAKAHASHI
  • Publication number: 20200006323
    Abstract: Provided is a semiconductor device including a first MOSFET; a second MOSFET; a first resistor provided between a gate terminal of the first MOSFET and a source terminal of the second MOSFET; a second resistor provided between a source terminal of the first MOSFET and a gate terminal of the second MOSFET; a first diode provided in series with the first resistor between the gate terminal of the first MOSFET and the source terminal of the second MOSFET; and a second diode provided in series with the second resistor between the source terminal of the first MOSFET and the gate terminal of the second MOSFET.
    Type: Application
    Filed: April 24, 2019
    Publication date: January 2, 2020
    Inventor: Yasuaki SAKAI
  • Patent number: 10474086
    Abstract: The image forming apparatus includes: a paper feed unit; a print unit; a registration roller; a sheet leading end sensor provided downstream, in a transport direction of the recording paper, of the registration roller; a time measuring unit for measuring a time from a start point of transportation of the recording paper by the registration roller to a point of detection of the leading end of the recording paper by the sheet leading end sensor; a memory unit for storing a reference image forming time and a reference time; a print control unit; and an arithmetic unit for obtaining a difference between the reference time and the time detected by the time measuring unit. The print control unit adjusts the length of the image forming period in accordance with the adjusted image forming time determined based on the difference obtained by the arithmetic unit and the reference image forming time.
    Type: Grant
    Filed: April 25, 2012
    Date of Patent: November 12, 2019
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Norio Tomita, Yasuaki Fukada, Hidetoshi Atsumi, Koji Wakamoto, Atsushi Ogo, Ryosuke Sakai
  • Patent number: 10428414
    Abstract: The present invention provides a carburized part having a total amount of TiC, AlN and ZrC, which are precipitate particles, of 4.5×10?10 mole or less per 1 mm2 of grain boundary area of prior austenite grains after carburization. According to the present invention, it is possible to provide a carburized part which allows effective inhibition of abnormal grain growth in spite of a carburizing treatment and makes it possible to solve the problem of reduction in properties caused by abnormal grain growth.
    Type: Grant
    Filed: June 24, 2014
    Date of Patent: October 1, 2019
    Assignee: DAIDO STEEL CO., LTD.
    Inventors: Kyohei Nakayama, Yasuaki Sakai, Toshiyuki Morita, Keisuke Inoue
  • Patent number: 10427981
    Abstract: A piezoelectric material contains: a first component which is a rhombohedral crystal in a single composition, has a Curie temperature Tc1, and is a lead-free-system composite oxide having a perovskite-type structure; a second component which is a crystal other than the rhombohedral crystal in a single composition, has a Curie temperature Tc2<Tc1, and is a lead-free-system composite oxide having a perovskite-type structure; and a third component which is a crystal other than the rhombohedral crystal in a single composition similar to the second component, has a Curie temperature Tc3?Tc1, and is a lead-free-system composite oxide that has a perovskite-type structure and is different from the second component. When a molar ratio of the third component to the sum of the second component and the third component is ? and ?×Tc3+(1??)×Tc2 is Tc4, |Tc4?Tc2|?50° C.
    Type: Grant
    Filed: December 26, 2014
    Date of Patent: October 1, 2019
    Assignee: Seiko Epson Corporation
    Inventors: Koji Sumi, Kazuya Kitada, Tomohiro Sakai, Yasuaki Hamada, Tetsuya Isshiki, Satoshi Kimura, Akio Ito, Tsuneo Handa
  • Patent number: 10389351
    Abstract: Reverse recovery current flowing through a MOSFET (Metal Oxide Semiconductor Field Effect Transistor) having been turned off can become reverse recovery loss. Reverse recovery loss of the MOSFET is desirably reduced. A semiconductor apparatus including: a MOSFET portion; and a diode portion connected in anti-parallel with the MOSFET portion, wherein reverse recovery current flows through the diode portion after reverse recovery current of the MOSFET portion becomes zero is provided.
    Type: Grant
    Filed: August 28, 2018
    Date of Patent: August 20, 2019
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventor: Yasuaki Sakai
  • Patent number: 10355381
    Abstract: A board connector (10) includes a housing (20), fixing members (50) and a shield member (70). The housing (20) holds a terminal fitting (40). The fixing member (50) includes a housing fixing portion (51) to be fixed to the housing (20) and a board fixing portion (52) to be fixed to a circuit board (90) while being electrically connected to the circuit board (90). The shield member (70) includes mounting portions (75) to be mounted on the housing (75) and covering portions (77) for covering outer side surfaces of the fixing members (50) in a mounting direction of the mounting portions (75), and the covering portions (77) include contact portions (81) configured to come into contact with the outer side surfaces of the fixing members (50).
    Type: Grant
    Filed: April 18, 2017
    Date of Patent: July 16, 2019
    Assignee: Sumitomo Wiring Systems, Ltd.
    Inventors: Yoshiyuki Ishikawa, Yasuaki Nakayama, Kenji Makino, Masami Sakai
  • Patent number: 10287668
    Abstract: Provided is a case hardening steel which allows effective inhibition of abnormal grain growth during carburizing treatment or the like and makes it possible to solve the problem of abnormal grain growth-induced reduction in characteristics. In the case hardening steel, a total amount of TiC, ZrC and AlN which are precipitate particles contained in 100 g of a steel material after subjecting the case hardening steel to hot rolling is 3.5×10?4 mole or less.
    Type: Grant
    Filed: June 23, 2014
    Date of Patent: May 14, 2019
    Assignee: DAIDO STEEL CO., LTD.
    Inventors: Kyohei Nakayama, Yasuaki Sakai, Toshiyuki Morita, Keisuke Inoue
  • Publication number: 20190103866
    Abstract: Reverse recovery current flowing through a MOSFET (Metal Oxide Semiconductor Field Effect Transistor) having been turned off can become reverse recovery loss. Reverse recovery loss of the MOSFET is desirably reduced. A semiconductor apparatus including: a MOSFET portion; and a diode portion connected in anti-parallel with the MOSFET portion, wherein reverse recovery current flows through the diode portion after reverse recovery current of the MOSFET portion becomes zero is provided.
    Type: Application
    Filed: August 28, 2018
    Publication date: April 4, 2019
    Inventor: Yasuaki SAKAI
  • Publication number: 20160145732
    Abstract: The present invention provides a carburized part having a total amount of TiC, AlN and ZrC, which are precipitate particles, of 4.5×10?10 mole or less per 1 mm2 of grain boundary area of prior austenite grains after carburization. According to the present invention, it is possible to provide a carburized part which allows effective inhibition of abnormal grain growth in spite of a carburizing treatment and makes it possible to solve the problem of reduction in properties caused by abnormal grain growth.
    Type: Application
    Filed: June 24, 2014
    Publication date: May 26, 2016
    Applicant: DAIDO STEEL CO., LTD.
    Inventors: Kyohei NAKAYAMA, Yasuaki SAKAI, Toshiyuki MORITA, Keisuke INOUE
  • Publication number: 20150000795
    Abstract: Provided is a case hardening steel which allows effective inhibition of abnormal grain growth during carburizing treatment or the like and makes it possible to solve the problem of abnormal grain growth-induced reduction in characteristics. In the case hardening steel, a total amount of TiC, ZrC and AlN which are precipitate particles contained in 100 g of a steel material after subjecting the case hardening steel to hot rolling is 3.5×10?4 mole or less.
    Type: Application
    Filed: June 23, 2014
    Publication date: January 1, 2015
    Applicant: DAIDO STEEL CO., LTD.
    Inventors: Kyohei NAKAYAMA, Yasuaki SAKAI, Toshiyuki MORITA, Keisuke INOUE