Patents by Inventor Tsuyoshi Asai

Tsuyoshi Asai 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: 20190181699
    Abstract: A stator includes a main yoke having a cylindrical shape with a bottom, an auxiliary yoke having a band shape arranged on an outer or inner circumferential wall surface of this main yoke, and a field magnet arranged inside the main yoke. The auxiliary yoke is arranged along a circumferential direction on the outer or inner circumferential wall surface of the main yoke. One end of the auxiliary yoke has at least one protrusion, and another end of the auxiliary yoke has at least one recess facing and engaging in a circumferential direction with the protrusion either on the inner or outer circumferential wall surface of the main yoke.
    Type: Application
    Filed: February 14, 2019
    Publication date: June 13, 2019
    Inventors: Tsuyoshi MATSUDA, Kazuhiro MIURA, Yuuya ASAI, Takashi NAGAYA, Takumi OKANO, Isoshi SOGA, Kazuya NAGASAKA
  • Patent number: 7449044
    Abstract: An object of the present invention is to provide a method for production of metallic powder in which aggregation of particles and growth to secondary particle after reducing process of the metallic powder particle can be prevented, to reliably obtain metallic particles containing few coarse particles and to meet requirements of thinner layer and greater number of layers in recent capacitors, and a production device therefor. The present invention includes a reducing process in which metal chloride gas and reducing gas are contacted to continuously reduce the metal chloride, and a cooling process in which a gas containing metallic powder generated in the reducing process is continuously cooled by inert gas. In the cooling process, a vortex flow is generated by blowing out the inert gas from at least one part around the flowing passage of the metallic powder.
    Type: Grant
    Filed: September 12, 2003
    Date of Patent: November 11, 2008
    Assignee: Toho Titanium Co., Ltd.
    Inventors: Tsuyoshi Asai, Takuya Miyagi
  • Publication number: 20060162496
    Abstract: An object of the present invention is to provide a method for production of metallic powder in which aggregation of particles and growth to secondary particle after reducing process of the metallic powder particle can be prevented, to reliably obtain metallic particles containing few coarse particles and to meet requirements of thinner layer and greater number of layers in recent capacitors, and a production device therefor. The present invention includes a reducing process in which metal chloride gas and reducing gas are contacted to continuously reduce the metal chloride, and a cooling process in which a gas containing metallic powder generated in the reducing process is continuously cooled by inert gas. In the cooling process, a vortex flow is generated by blowing out the inert gas from at least one part around the flowing passage of the metallic powder.
    Type: Application
    Filed: September 12, 2003
    Publication date: July 27, 2006
    Inventors: Tsuyoshi Asai, Takuya Miyagi
  • Patent number: 6863708
    Abstract: Metal chloride vapor and reducing gas are brought into contact to form metallic powder, the metallic powder is washed in carbonic acid aqueous solution, and the metallic powder is classified in a liquid phase. In this way, metallic powder, such as nickel powder, in which the content of chloride components is extremely small and the coarse particle content is small, can be efficiently produced.
    Type: Grant
    Filed: June 11, 2002
    Date of Patent: March 8, 2005
    Assignee: Toho Titanium Co., Ltd.
    Inventors: Wataru Kagohashi, Mitsugu Yoshida, Tsuyoshi Asai
  • Publication number: 20030159281
    Abstract: Metal chloride vapor and reducing gas are brought into contact to form metallic powder, the metallic powder is washed in carbonic acid aqueous solution, and the metallic powder is classified in a liquid phase. In this way, metallic powder, such as nickel powder, in which the content of chloride components is extremely small and the coarse particle content is small, can be efficiently produced.
    Type: Application
    Filed: February 5, 2003
    Publication date: August 28, 2003
    Inventors: Wataru Kagohashi, Mitsugu Yoshida, Tsuyoshi Asai
  • Patent number: 6500227
    Abstract: In a process for production of ultrafine nickel powder, raw material gas having a partial pressure of nickel chloride vapor within a range from 0.2 to 0.7 is fed into a reducing furnace and the nickel chloride vapor is reduced with hydrogen while flowing the raw material gas in this reducing furnace at a space velocity (SV) within a range from 0.02 to 0.07 sec−1.
    Type: Grant
    Filed: January 23, 2001
    Date of Patent: December 31, 2002
    Assignee: Toho Titanium Co., Ltd.
    Inventors: Tsuyoshi Asai, Hideo Takatori
  • Patent number: 6372015
    Abstract: A process for production of metallic powder comprising contacting a metallic chloride gas with a reductive gas in a temperature range for a reducing reaction to form a metallic powder and subsequently contacting the metallic powder with an inert gas such as nitrogen gas to cool the powder, wherein the rate of cooling is 30° C. or more for temperatures from the temperature range for the reducing reaction to a temperature of 800°C. or less. The metallic powder is rapidly cooled, which results in suppression of agglomeration of particles in the metallic powder and the growth of secondary particles. Growth of particles of a metallic powder formed in a reduction process into secondary particles through agglomeration after the reduction process is suppressed, and a ultrafine metallic powder having a particle diameter of, for example, 1&mgr;m or less, can be reliably produced.
    Type: Grant
    Filed: January 27, 2000
    Date of Patent: April 16, 2002
    Assignee: Toho Titanium Co., Ltd.
    Inventors: Tsuyoshi Asai, Hideo Takatori, Wataru Kagohashi
  • Patent number: 6235077
    Abstract: Chlorine gas from a supply nozzle is mixed with the vapor of nickel chloride and the mixed gas is supplied from a supply nozzle into a hydrogen gas atmosphere in a reduction reactor at a reduction temperature of 900 to 1100° C. The volume of chlorine gas to be mixed versus the vapor of nickel chloride is adjusted to a ratio of 0.01 to 0.5 moles per mole of the vapor of nickel chloride. The particle size of the nickel powder can be controlled appropriately, and also, uniformity of particle size, smoothability of surfaces of particles, and sphericity can be improved.
    Type: Grant
    Filed: October 12, 1999
    Date of Patent: May 22, 2001
    Assignee: Toho Titanium Co., Ltd.
    Inventors: Wataru Kagohashi, Tsuyoshi Asai, Hideo Takatori
  • Patent number: 5054967
    Abstract: A throw away cutting tool comprising a holder formed with a wedge groove and a throw away insert having a cutting edge at one end thereof and a wedge portion at the other end, the wedge portion being adapted to be clamped in the wedge groove by elasticity of the material of the holder. The holder is at least partly made of cemented carbide for higher rigidity and cutting stability. Also, the radius of curvature at the deep end of the wedge groove is optimized for crack resistance. Further, the angle of the V-ridge on the holder is interrelated to the angle of the V-groove in the insert for more holding stability and crack resistance.
    Type: Grant
    Filed: November 29, 1989
    Date of Patent: October 8, 1991
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Kazuo Noguchi, Nobuhiro Takahashi, Masafumi Hideshima, Tsuyoshi Asai
  • Patent number: 4909677
    Abstract: A throw away cutting tool comprising a holder formed with a wedge groove and a throw away insert having a cutting edge at one end thereof and a wedge portion at the outer end, the wedge portion being adapted to be clamped in the wedge groove by elasticity of the material of the holder. The holder is at least partly made of cemented carbide for higher rigidity and cutting stability. Also, the radius of curvature at the deep end of the wedge groove is optimized for crack resistance. Further, the angle of the V-ridge on the holder is interrelated to the angle of the V-groove in the insert for more holding stability and crack resistance.
    Type: Grant
    Filed: May 18, 1988
    Date of Patent: March 20, 1990
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Kazuo Noguchi, Nobuhiro Takahashi, Masafumi Hideshima, Tsuyoshi Asai
  • Patent number: 4639352
    Abstract: This invention relates to a hard alloy comprising two phases: a hard phase consisting of at least one compound having a crystal structure of simple hexagonal MC type (M: metal; C: carbon) selected from the group consisting of mixed carbides, carbonitrides and carboxynitrides of molybdenum and tungsten, and a binder phase consisting of at least one element selected from the group consisting of iron, cobalt and nickel. The hard phase is prepared by carburizing an (Mo, W) alloy obtained by reducing oxides of molybdenum and tungsten with a particle size of at most 1 micron, is composed of coarse particles with a mean particle size of at least 3 microns, and has a uniform molybdenum to tungsten ratio in the particles. The hard alloy has a gross composition within the range of the shaded portion ABCDEA in FIG. 1.
    Type: Grant
    Filed: December 13, 1985
    Date of Patent: January 27, 1987
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Mitsuo Kodama, Masaya Miyake, Minol Nakano, Tsuyoshi Asai, Akio Hara
  • Patent number: 4290807
    Abstract: This invention relates to a hard alloy consisting of a metallic phase and a hard phase having a B1 type crystal structure, and being represented by the following general formula,(M.sub.1a, M.sub.2b, M.sub.3c)(C.sub.1-x-y N.sub.y O.sub.x).sub.zin which M.sub.1 is at least one of Group IVa elements, M.sub.2 is at least one of Group VIa elements, M.sub.3 is at least one of Group Va elements, C is carbon, N is nitrogen, O is oxygen, a, b, c, x and y are respectively atomic ratios satisfying the relations of a+b+c=1, 0.1.ltoreq.(a+c)/a+b+c).ltoreq.0.7 (c can be zero), 0.05.ltoreq.x.ltoreq.0.5, 0.ltoreq.y.ltoreq.0.5, 0.05.ltoreq.x+y.ltoreq.0.6 and z is an atomic ratio of (C+N+O)/M.sub.1 +M.sub.2 +M.sub.3) satisfying the relation of 0.1.ltoreq.z.ltoreq.0.5.
    Type: Grant
    Filed: September 13, 1978
    Date of Patent: September 22, 1981
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Tsuyoshi Asai, Naoji Fujimori, Takaharu Yamamoto
  • Patent number: 4279651
    Abstract: The invention relates to a sintered hard metal having a high wear resistance and heat resistance as material for cutting tools and wear resistant tools and the method for producing the same. The sintered hard metal has a hard phase comprising a phase having a B-1 type crystal structure containing more than one kind of IVa, Va and VIa group metals in the Periodic Table and also the elements, carbon, nitrogen and oxygen and a WC phase, the hard phase and a bonding phase chiefly consisting of a ferrous metal which is sintered by a powder metallurgy technique, whereas the oxygen in particular is added thereto making it possible to obtain a sintered hard metal having said excellent properties.
    Type: Grant
    Filed: December 28, 1978
    Date of Patent: July 21, 1981
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Naoji Fujimori, Masaaki Tobioka, Tsuyoshi Asai, Takaharu Yamamoto, Masaya Miyake
  • Patent number: 4277283
    Abstract: This invention relates to a sintered hard metal for cutting tools and having excellent wear resistance, resistance to thermal deformation, mechanical strength and the like. The present invention resides in the fact that the substrate metal consists of a rich content of the B-1 type hard phase and the surface thin layer consists of a rich content of the ordinary tungsten carbide. B-1 type crystal structure contains one or more Group IVa, Va and VIa metals, carbon, nitrogen and, moreover, tungsten. The thin layer structure has the layer of 5 to 200.mu. thickness on the surface thereof.
    Type: Grant
    Filed: December 19, 1978
    Date of Patent: July 7, 1981
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Masaaki Tobioka, Mitsuo Kodama, Tsuyoshi Asai, Takaharu Yamamoto
  • Patent number: 4239536
    Abstract: This invention relates to a surface-coated sintered hard body comprising an alloy consisting of at least one of carbides and carbonitrides of Group IVa, Va and VIa transition metals, cemented by at least one of metals and alloys, and two interior and exterior coated layers, the interior layer being a monolayer or multilayer consisting of at least one of carbides, carbonitrides and nitrides of Group IVa, Va and VIa transition metals, in which a part of the non-metallic element or elements are optionally replaced by oxygen, and at least one layer of the interior layer consisting of at least one of carbides, carbonitrides and nitrides of Group IVa, Va and VIa transition metals, in which a part or all of the non-metallic element or elements are replaced by boron, and the exterior layer consisting of at least one of aluminum oxide, zirconium oxide and mixtures or compounds thereof.
    Type: Grant
    Filed: September 8, 1978
    Date of Patent: December 16, 1980
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Takaharu Yamamoto, Tsuyoshi Asai, Naoji Fujimori, Masa-aki Tobioka
  • Patent number: 4120719
    Abstract: The present invention relates to a hard cemented carbonitride alloy for cutting tools, which comprises 97 to 75% by weight of a hard phase and 3 to 25% by weight of a binder metal, the hard phase consisting of metallic components of titanium as a main component, 5 to 40% by weight of one or more of tungsten and molybdenum and 3 to 40% by weight of tantalum and non-metallic components of carbon and nitrogen, the proportion of nitrogen being 5 to 40% by weight of the non-metallic components and the binder metal being at least one element selected from the group consisting of iron, cobalt and nickel.
    Type: Grant
    Filed: December 6, 1976
    Date of Patent: October 17, 1978
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Toshio Nomura, Tsuyoshi Asai, Takaharu Yamamoto, Akio Hara
  • Patent number: 4049876
    Abstract: This invention relates to a cemented carbonitride alloy in which the hard phase consists of[(Group IVa metal).sub.A (Group Va metal).sub.B (Group VIa metal).sub.C ]-(C.sub.X N.sub.Y).sub.Zwherein A, B, C, X and Y are respectively mole fractions, Z is a mole ratio of the metalloid components to the metal components and there are among A, B, C, X, Y and Z the relations ofA + B + C = 1, X + Y = 1,4a + 5b + 6c + 4xz + 5yz .gtoreq. 8.6,0.05 .ltoreq. y .ltoreq. 0.50 and 0.85 .ltoreq. Z .ltoreq. 1.0.the hard phase is combined by at least one binder metal from the iron group and there are in the alloy structure WC phase and the hard phase having the crystal structure B1 and containing Ti in a proportion of at least 20 atomic percent to the metallic atoms.
    Type: Grant
    Filed: November 18, 1976
    Date of Patent: September 20, 1977
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Takaharu Yamamoto, Toshio Nomura, Tsuyoshi Asai, Akio Hara