Patents by Inventor Shiro Sakuragi

Shiro Sakuragi 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: 9593432
    Abstract: A coating method for coating a crucible and a quartz crucible for growing a silicon crystal are provided. In the coating method, a bubble-free quartz layer which is 80 ?m to 4 mm thick is formed on an inner surface of a crucible for growing a silicon crystal, and the surface of the bubble-free quartz layer is covered with alkaline earth hydroxide, following which heating is performed to a temperature at which the surface becomes devitrified. The surface may be covered by immersing the inner surface in a solution of the alkaline earth hydroxide. The heating may be performed before the crucible for growing silicon crystal is filled with a solid raw material to be melted.
    Type: Grant
    Filed: December 2, 2011
    Date of Patent: March 14, 2017
    Assignee: FTB RESEARCH INSTITUTE CO., LTD
    Inventors: Yukichi Horioka, Shiro Sakuragi
  • Publication number: 20160068748
    Abstract: An Eu-doped SrI2 single crystal having a fluorescence spectrum in which the intensity ratio of defect-related luminescence at around 550 nm to Eu-derived luminescence at around 430 nm is 1% or less, the fluorescence spectrum being measured at room temperature using ultraviolet light having a wavelength of 193 nm as excitation light, and a radiation detector that includes a scintillator that includes the Eu-doped SrI2 single crystal.
    Type: Application
    Filed: September 4, 2015
    Publication date: March 10, 2016
    Inventor: Shiro SAKURAGI
  • Publication number: 20140150714
    Abstract: A coating method for coating a crucible and a quartz crucible for growing a silicon crystal are provided. In the coating method, a bubble-free quartz layer which is 80 ?m to 4 mm thick is formed on an inner surface of a crucible for growing a silicon crystal, and the surface of the bubble-free quartz layer is covered with alkaline earth hydroxide, following which heating is performed to a temperature at which the surface becomes devitrified. The surface may be covered by immersing the inner surface in a solution of the alkaline earth hydroxide. The heating may be performed before the crucible for growing silicon crystal is filled with a solid raw material to be melted.
    Type: Application
    Filed: December 2, 2011
    Publication date: June 5, 2014
    Applicant: FTB RESEARCH INSTITUTE CO., LTD.
    Inventors: Yukichi Horioka, Shiro Sakuragi
  • Patent number: 6428617
    Abstract: The apparatus is provided with a vessel 1 for accommodating a melt 3 of material sought to be crystallized, and heaters 2 disposed symmetrically on both sides of the vessel. The vessel 1 has an interior space whose front cross section is symmetrical in shape along a vertical center line. The heaters 2 heat the vessel to create a temperature distribution in the melt in which the upper part of the vessel 1 is at a higher temperature, and the lower part thereof is at a lower temperature. The temperature distribution causes symmetrical convection flows of the melt in such a manner that two flows each move up along the side walls of the interior space of the vessel 1 and meet with each other at the top of the interior space where the vertical center line runs, and move together down along the vertical center line toward the bottom of the interior space. A single crystal is formed as the temperature at the lower end of the vessel 1 is gradually lowered below the melting point of the material.
    Type: Grant
    Filed: September 19, 2000
    Date of Patent: August 6, 2002
    Assignee: Union Material, Inc.
    Inventors: Shiro Sakuragi, Yutaka Taguchi
  • Publication number: 20020027412
    Abstract: A fluoride-based fluorescent material designated by a composition formula of MFn:R, wherein M is at least one element selected from the group consisting of rare earth elements, Al and Bi, alkaline earth metals, and alkaline metals, and R is a rare-earth-based activator including at least either Tb or Tb and Ce and n=1, 2 or 3. The fluoride-based fluorescent materials efficiently emit white-light of a luminescent peak at 543 nm.
    Type: Application
    Filed: July 11, 2001
    Publication date: March 7, 2002
    Applicant: NEC CORPORATION
    Inventors: Hisashi Yoshida, Maki Minamoto, Masato Hayashi, Shiro Sakuragi, Takeshi Hirai
  • Patent number: 6097088
    Abstract: A thermoelectric chip unit (1) comprises equal numbers of n-type thermoelectric semiconductor elements (30n) and p-type thermoelectric semiconductor elements (30p) that are held embedded within a single chip substrate (2). It is therefore difficult for the crystals of the thermoelectric semiconductor elements (30) to split at the cleavage surfaces thereof. The thermoelectric chip unit (1) can be made to be flexible by forming the chip substrate (2) of a flexible insulator such as plastic or rubber. A thermoelectric unit (4) comprises this thermoelectric chip unit (1) to which are attached electrodes (5). The thermoelectric unit (4) can be made to be flexible by forming the electrodes (5) of flexible members such as thin copper plates. A thermoelectric module (6) comprises the thermoelectric unit (4) to which is attached a flexible sheet or cover (8). This thermoelectric module (6) can be used as a cooling device for a computer's CPU or a semiconductor laser, or in an insulated refrigerator.
    Type: Grant
    Filed: May 21, 1997
    Date of Patent: August 1, 2000
    Assignees: Morix Co., Ltd., Silicon Engineering Laboratory Ltd., Sunx Trading Co., Ltd.
    Inventor: Shiro Sakuragi
  • Patent number: 6002081
    Abstract: A thermoelectric component is provided. The component comprises a partition plate with electrical insulation, P-type and n-type thermoelectrical semiconductor elements that are equal in number and retained with juts in the partition plate, flat metallic electrodes connected to the cold junction of the p-type and n-type thermoelectric semiconductor elements, and T-shaped metallic electrodes connected to the hot junction of the p-type and n-type thermoelectric semiconductor elements.
    Type: Grant
    Filed: July 7, 1997
    Date of Patent: December 14, 1999
    Assignee: S.E.L. USA Inc.
    Inventor: Shiro Sakuragi
  • Patent number: 5885345
    Abstract: A shaper (2) is arranged within a shaping vessel (1). A raw material for a crystal is inserted into the shaping vessel (1) and a crystal melt (5) is formed by setting it in a predetermined atmosphere and heating it. A mechanical force F1 is applied to the crystal melt (5), which is present on the upper surface of the shaper (2), by a pressuring member (4) from above. The crystal melt (5) has nowhere to escape but a gap (3) formed by the shaper(2), so it is injected into that gap (3) as shown by the arrow. This method of fabricating a shaped crystal is suitable for fabricating a monocrystal or multicrystal semiconductor from a material such as silicon, germanium, or bismuth telluride.
    Type: Grant
    Filed: May 21, 1997
    Date of Patent: March 23, 1999
    Assignee: Union Material Inc.
    Inventor: Shiro Sakuragi
  • Patent number: 4717238
    Abstract: An infrared optical fiber comprises a core preponderantly made of a halogenide and a trace quantity of a dopant formed of a halogenide and retains its infrared transmission property stably for a long time.
    Type: Grant
    Filed: January 16, 1981
    Date of Patent: January 5, 1988
    Assignees: Agency of Industrial Science & Technology, Ministry of International Trade & Industry
    Inventors: Shiro Sakuragi, Kyoshiro Imagawa
  • Patent number: 4572609
    Abstract: A mechanism for cooling optical fibers which include optical fibers, metal netting wound around the fibers to conduct heat therefrom, and a sheath in which the fibers and netting are inserted. In accordance with one embodiment, the sheath and netting are spaced from each other so as to permit cooling air to flow therebetween to cool the fibers. In another embodiment, the netting is connected to a cooler by a heat connected element so that heat in the fibers is drawn to the cooler through the heat conductive element to cool the fibers.
    Type: Grant
    Filed: December 7, 1984
    Date of Patent: February 25, 1986
    Assignee: Agency of Industrial Science & Technology
    Inventors: Shiro Sakuragi, Mitsunori Saitoh, Haruo Kotani, Kyoshiro Imagawa
  • Patent number: 4491385
    Abstract: A construction for holding optical fibers, in which at least one of the ends of an optical fiber in a cable is a free end which is slidably and rotatively mounted to a hand piece at an end of the cable so as to prevent breakage of the optical fiber during bending of the cable.
    Type: Grant
    Filed: July 8, 1982
    Date of Patent: January 1, 1985
    Assignee: Agency of Industrial Science & Technology
    Inventors: Kyoshiro Imagawa, Shiro Sakuragi, Mitsunori Saitoh
  • Patent number: 4458683
    Abstract: A focal point direct observation type laser scalpel device has a construction wherein laser beams generated by an infrared laser generator and transmitted through an optical fiber adapted for infrared laser beams and visible rays issued from a visible ray source and transmitted through optical fibers adapted for visible rays are passed through one common converging lens system so that recognition of the focal point of the laser beams is accomplished by visual observation of the focal point of the visible rays.
    Type: Grant
    Filed: March 5, 1982
    Date of Patent: July 10, 1984
    Assignees: Agency of Industrial Science & Technology, Ministry of International Trade & Industry
    Inventors: Mitsunori Saito, Shiro Sakuragi, Kyoshiro Imagawa
  • Patent number: 4443684
    Abstract: A CO.sub.2 laser machining apparatus, has a CO.sub.2 laser oscillator connected with a condenser through a flexible cable including a fiber bundle for transmitting infrared rays of 10.6 micrometers therein.
    Type: Grant
    Filed: December 30, 1981
    Date of Patent: April 17, 1984
    Assignee: Horiba, Ltd.
    Inventors: Shiro Sakuragi, Kyoshiro Imagawa, Haruo Kotani, Mitsunori Saito, Tomoyuki Haga
  • Patent number: 4423726
    Abstract: A safety device for a laser ray guide in which a laser ray-receiving element is installed on the input side of a lens of a laser ray guide including said lens, and troubles occurring in said laser ray guide can be detected by means of said laser ray-receiving element.
    Type: Grant
    Filed: October 20, 1981
    Date of Patent: January 3, 1984
    Assignee: Agency of Industrial Science & Technology
    Inventors: Kyoshiro Imagawa, Shiro Sakuragi
  • Patent number: 4396797
    Abstract: A flexible cable suitably used as a jacket or cover for an inner conduit member such as a gas conduit or a liquid conduit, a signal transmission line, or an energy transmission line, or the like, which can provide safe use of the conduit inserted thereinto by limiting the bending radius thereof. The cable includes a plurality of axially symmetrical pipe members having large and small diameter ends which are assembled with the small ends of each pipe member fitted into the large end of an adjacent pipe member and loosely fitting flexible ring members fitted over the small ends of the pipe members.
    Type: Grant
    Filed: December 21, 1981
    Date of Patent: August 2, 1983
    Assignee: Horiba, Ltd.
    Inventors: Shiro Sakuragi, Kyoshiro Imagawa
  • Patent number: 4381141
    Abstract: A preform is prepared to comprise a step index structure consisting of a core and a clad both made of metal halogenides or arsenic-selenium glass sparingly capable of transmitting infrared light of long wavelength and a layer of lubricant applied to the outer surface of the clad. The preform is set inside a metal cylinder. By pulling this metal cylinder through a plurality of dies containing orifices of successively decreased diameters at a temperature below the melting point, the preform can be elongated into an optical fiber of a prescribed diameter. The optical fiber thus produced is capable of transmitting infrared light of high power with a small loss. Protected and reinforced by the metal cylinder jacket, this fiber enjoys high mechanical strength.
    Type: Grant
    Filed: January 16, 1981
    Date of Patent: April 26, 1983
    Assignees: Agency of Industrial Science & Technology, Ministry of International Trade & Industry
    Inventors: Shiro Sakuragi, Haruo Kotani
  • Patent number: 4375314
    Abstract: An optical fiber for infrared transmission constructed by winding a cladding around a core in the manner of a coil, the cladding having a refractive index lower than that of the core, a protective tube being employed to jacket the clad core.
    Type: Grant
    Filed: January 14, 1981
    Date of Patent: March 1, 1983
    Assignee: Agency of Industrial Science and Technology
    Inventors: Shiro Sakuragi, Kyoshiro Imagawa, Mitsunori Saito