Patents by Inventor Takahiro Hashimoto

Takahiro Hashimoto 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: 20030062098
    Abstract: An alloy powder for bonded rare earth magnets is prepared by melting an alloy consisting essentially of 20-30 wt % of Sm or a mixture of rare earth elements (inclusive of Y) containing at least 50 wt % of Sm, 10-45 wt % of Fe, 1-10 wt % of Cu, 0.5-5 wt % of Zr, and the balance of Co, quenching the melt by a strip casting technique, to form a rare earth alloy strip containing at least 20% by volume of equiaxed crystals with a grain size of 1-200 &mgr;m and having a gage of 0.05-3 mm, and heat treating the strip in a non-oxidizing atmosphere at 1000-1300° C. for 0.5-20 hours, followed by aging treatment and grinding.
    Type: Application
    Filed: May 21, 2002
    Publication date: April 3, 2003
    Inventors: Kazuaki Sakaki, Koji Sato, Takahiro Hashimoto, Takehisa Minowa
  • Patent number: 6527822
    Abstract: Disclosed is a novel thin ribbon of a rare earth/iron/boron-based magnet alloy prepared by quenching of an alloy melt by the method of strip casting, from which a sintered permanent magnet is obtained by the powder metallurgical method.
    Type: Grant
    Filed: August 31, 2001
    Date of Patent: March 4, 2003
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Koichi Hirota, Takehisa Minowa, Takahiro Hashimoto, Koji Sato, Kenji Yamamoto
  • Publication number: 20030002553
    Abstract: There is provided a semiconductor laser device which is generally uniform in carrier concentration of a clad layer, almost free from strain, and less demanding for time and labor in its manufacturing, and which has stable characteristics. On an n-GaAs substrate, an n-type clad layer, an active layer, a p-type clad layer, and a cap layer are stacked one on another at a temperature of 700-750° C. Widthwise both side portions of the cap layer as well as widthwise both side specified-depth portions of the p-type clad layer are removed by etching to form a ridge portion, and a current constriction layer is formed on widthwise both sides of the ridge portion. A flattening layer having a planar surface is formed on the current constriction layer and the cap layer by slow cooling LPE process at a temperature of 700° C. or lower. On the flattening layer, a contact layer is formed by MOCVD process at a temperature of about 650° C.
    Type: Application
    Filed: July 2, 2002
    Publication date: January 2, 2003
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: Satofumi Kinei, Takahiro Hashimoto
  • Publication number: 20020179244
    Abstract: Distribution of machining ability in periphery surface is grasped and evaluated through measuring the machined depth at several positions of the peripheral portion by use of a wafer for the evaluation of the ability of machining the peripheral portion thereof.
    Type: Application
    Filed: December 6, 2001
    Publication date: December 5, 2002
    Inventors: Takahiro Hashimoto, Kazutoshi Mizushima
  • Patent number: 6419723
    Abstract: Disclosed is a thin alloy ribbon prepared by the strip casting method as an intermediate for the preparation of a sintered rare earth-based permanent magnet or, in particular, a neodymium/iron/boron-type permanent magnet. The thin alloy ribbon is characterized by a specific volume fraction of the four-phase coexisting region consisting of the &agr;-iron phase, R-rich phase, RXT4B4 phase and R2T14B phase each having an average grain diameter in a specified range and a specific volume fraction of the chill crystalline phase. When these requirements are satisfied, the sintered rare earth-based permanent magnet prepared from the thin alloy ribbons can be imparted with improved magnetic properties and high sintering density even without increasing the sintering temperature.
    Type: Grant
    Filed: August 31, 2001
    Date of Patent: July 16, 2002
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Koichi Hirota, Takahiro Hashimoto, Koji Sato, Kenji Yamamoto, Takehisa Minowa
  • Patent number: 6421606
    Abstract: A route guiding apparatus provides information for a route using public transportation as an alternative to a vehicular route. In addition to searching for a vehicular route from a current location to a destination, it is determined whether the current location and the destination are within a zone in which public transportation can be used. When the current location and the destination are determined to be within a public transportation zone, a route using public transportation is searched for. Subsequently, the cost of the route using public transportation and the cost of the vehicular route are compared. When the cost of the public transportation route falls within a predetermined limit, the apparatus indicates the public transportation route. The route costs are calculated considering factors such as required travel time and ticket fees. The apparatus may also recommend public transportation when no parking is available near the destination, or based on traffic information concerning the vehicular route.
    Type: Grant
    Filed: August 14, 2000
    Date of Patent: July 16, 2002
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Goro Asai, Fusaki Igarashi, Kenichi Murata, Takahiro Hashimoto, Masaki Kakihara
  • Publication number: 20020054825
    Abstract: A rare-earth alloy ingot is produced by melting an alloy composed of 20-30 wt % of a rare-earth constituent which is Sm alone or at least 50 wt % Sm in combination with at least one other rare-earth element, 10-45 wt % of Fe, 1-10 wt % of Cu and 0.5-5 wt % of Zr, with the balance being Co, and quenching the molten alloy in a strip casting process. The strip-cast alloy ingot has a content of 1-200 &mgr;m size equiaxed crystal grains of at least 20 vol % and a thickness of 0.05-3 mm. Rare-earth sintered magnets made from such alloys exhibit excellent magnetic properties and can be manufactured under a broad optimal temperature range during sintering and solution treatment.
    Type: Application
    Filed: September 10, 2001
    Publication date: May 9, 2002
    Inventors: Kazuaki Sukaki, Koji Sato, Takahiro Hashimoto, Hajime Nakamura, Takehisa Minowa
  • Publication number: 20020017340
    Abstract: Disclosed is a thin alloy ribbon prepared by the strip casting method as an intermediate for the preparation of a sintered rare earth-based permanent magnet or, in particular, a neodymium/iron/boron-type permanent magnet. The thin alloy ribbon is characterized by a specific volume fraction of the four-phase coexisting region consisting of the &agr;-iron phase, R-rich phase, RxT4B4 phase and R2T14B phase each having an average grain diameter in a specified range and a specific volume fraction of the chill crystalline phase. When these requirements are satisfied, the sintered rare earth-based permanent magnet prepared from the thin alloy ribbons can be imparted with improved magnetic properties and high sintering density even without increasing the sintering temperature.
    Type: Application
    Filed: August 31, 2001
    Publication date: February 14, 2002
    Inventors: Koichi Hirota, Takahiro Hashimoto, Koji Sato, Kenji Yamamoto, Takehisa Minowa
  • Publication number: 20020003007
    Abstract: Disclosed is a novel thin ribbon of a rare earth/iron/boron-based magnet alloy prepared by quenching of an alloy melt by the method of strip casting, from which a sintered permanent magnet is obtained by the powder metallurgical method.
    Type: Application
    Filed: August 31, 2001
    Publication date: January 10, 2002
    Inventors: Koichi Hirota, Takehisa Minowa, Takahiro Hashimoto, Koji Sato, Kenji Yamamoto
  • Patent number: 6338020
    Abstract: A system for acquiring map information reliably even when a vehicle is running in a blind area where the map information is not acquirable in real time, assisting the vehicle to keep running smoothly. In this system, necessary map information can be acquired from an external information center upon request via a communication device. Specifying data of a blind area in which the map information is not acquirable in real time is previously stored in a memory. Based on the specifying data stored in the memory and a current position of the vehicle detected as by GPS, a processor acquires the map information of the blind area from the information center upon request when the vehicle approaches the blind area. The acquired map information is stored in the memory and is read out for use in navigation.
    Type: Grant
    Filed: November 19, 1998
    Date of Patent: January 8, 2002
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Takahiro Hashimoto
  • Patent number: 6335828
    Abstract: A micro-lens array sheet having a wide field angle, a field angle control, a high light efficiency, a high brightness and a high contrast, which is provided with a layer of micro-lenses each shaped to be a centro-symmetry convex or concave micro-lens. A layer of either a light diffusion sheet or a sheet filled with light diffusive agent is attached on a light transmitting side of the micro-lens array sheet. The micro-lenses are aligned in a diamond grid array or an array including a combination of diamond-shape and hexagonal-shape micro-lens blocks.
    Type: Grant
    Filed: October 26, 1999
    Date of Patent: January 1, 2002
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Takahiro Hashimoto, Tsutomu Sakamoto
  • Patent number: 6322637
    Abstract: Disclosed is a thin alloy ribbon prepared by the strip casting method as an intermediate for the preparation of a sintered rare earth-based permanent magnet or in particular, a neodymium/iron/boron-type permanent magnet. The thin alloy ribbon is characterized by a specific volume fraction of the four-phase coexisting region consisting of the &agr;-iron phase, R-rich phase, RxT4B4 phase and R2T14B phase each having an average grain diameter in a specified range and a specific volume fraction of the chill crystalline phase. When these requirements are satisfied, the sintered rare earth-based permanent magnet prepared from the thin alloy ribbons can be imparted with improved magnetic properties and high sintering density even without increasing the sintering temperature.
    Type: Grant
    Filed: June 7, 2000
    Date of Patent: November 27, 2001
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Koichi Hirota, Takahiro Hashimoto, Koji Sato, Kenji Yamamoto, Takehisa Minowa
  • Patent number: 6319335
    Abstract: Disclosed is a novel thin ribbon of a rare earth/iron/boron-based magnet alloy prepared by quenching of an alloy melt by the method of strip casting, from which a sintered permanent magnet is obtained by the powder metallurgical method.
    Type: Grant
    Filed: February 11, 2000
    Date of Patent: November 20, 2001
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Koichi Hirota, Takehisa Minowa, Takahiro Hashimoto, Koji Sato, Kenji Yamamoto
  • Publication number: 20010027374
    Abstract: A system for acquiring map information reliably even when a vehicle is running in a blind area where the map information is not acquirable in real time, assisting the vehicle to keep running smoothly. In this system, necessary map information can be acquired from an external information center upon request via a communication device. Specifying data of a blind area in which the map information is not acquirable in real time is previously stored in a memory. Based on the specifying data stored in the memory and a current position of the vehicle detected as by GPS, a processor acquires the map information of the blind area from the information center upon request when the vehicle approaches the blind area. The acquired map information is stored in the memory and is read out for use in navigation.
    Type: Application
    Filed: November 19, 1998
    Publication date: October 4, 2001
    Inventor: TAKAHIRO HASHIMOTO
  • Patent number: 5179943
    Abstract: Medical apparatus of the present invention effectively uses ozone as an anesthetic by spraying ozone gas onto affected bodily parts such as hands, arms, legs. Upon inserting affected parts in an airtight body, ozone gas is circulated in the airtight body; likewise, a sprayer for spraying ozone gas onto affected bodily parts is provided in a hood, which is attached to a conduit member having a feeding path and a withdrawing path, so as to feed ozone gas to the inner space of the hood.
    Type: Grant
    Filed: June 13, 1991
    Date of Patent: January 19, 1993
    Assignees: Kabushiki Kaisha Mihama Seisakusho, Yugen Kaisha Aoi Shoji
    Inventors: Mamoru Hama, Matao Mitsuyoshi, Takahiro Hashimoto