Patents by Inventor Koji Watari

Koji Watari 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: 20210230853
    Abstract: Provided are valve devices and flow heads for a valve device. A valve device can include a valve body (30) that opens and closes a valve hole (15a) to allow communication between a primary flow path (17a) and a secondary flow path (17b), a back pressure chamber (7) defined at the back side of the valve body, a small hole (51) that is provided in the valve body to allow the primary flow path of and the back pressure chamber to communicate with each other, and a pin (6) that has a straight portion inserted into the small hole to clean the small hole by relative motions of the small hole and the straight portion. A flow head (34) may be annular and include one or more notches along a perimeter and be configured to engage with an inner peripheral surface of an upper end portion of an inner barrel of the valve device.
    Type: Application
    Filed: May 17, 2019
    Publication date: July 29, 2021
    Applicant: AS America, Inc.
    Inventors: Marin Marinov, Walter Pitsch, Eric Soberano, Koji Shimizu, Kojiro Watari
  • Publication number: 20200216937
    Abstract: A steel material excellent in rolling fatigue property, the steel material including, in mass %: C: 0.10% to 1.50%, Si: 0.01% to 0.80%, Mn: 0.10% to 1.50%, Cr: 0.02% to 2.50%, Al: 0.002% to less than 0.010%, Ce+La+Nd: 0.0001% to 0.0025%, Mg: 0.0005% to 0.0050%, O: 0.0001% to 0.0020%, Ti: 0.000% to less than 0.005%, N: 0.0180% or less, P: 0.030% or less, S: 0.005% or less, Ca: 0.0000% to 0.0010%, V: 0.00 to 0.40%, Mo: 0.00 to 0.60%, Cu: 0.00 to 0.50%, Nb: 0.000 to less than 0.050%, Ni: 0.00 to 2.50%, Pb: 0.00 to 0.10%, Bi: 0.00 to 0.10%, B: 0.0000 to 0.0050%, and the balance being Fe and an impurity, wherein a fatigue-initiating inclusion detected by an ultrasonic fatigue test contains one or more of Ce, La, and Nd, and Mg, Al, and O, and a composition ratio in the fatigue-initiating inclusion satisfies Formula (1).
    Type: Application
    Filed: September 13, 2018
    Publication date: July 9, 2020
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Koji WATARI, Tatsuya IWASAKI, Junya YAMAMOTO
  • Publication number: 20200182286
    Abstract: A carburized shaft part having a predetermined composition, a C content at a surface layer part of a mass % of 0.60 to 1.00%, at least one hole at an outer circumferential surface, a total volume ratio of martensite and retained austenite of 97% or more at a structure at a position of a 1 mm depth from the outer circumferential surface in an axial direction of the hole and a position of a 20 ?m depth from the surface of the hole, a maximum retained austenite volume ratio (R1) of 10.0 to 30.0% at a position of a 1 mm depth from the outer circumferential surface in the axial direction of the hole and a range up to a 200 ?m depth from the surface of the hole, and a retained austenite reduction ratio of 20% or more found from R1 and the retained austenite volume ratio (R2) at a position of a 1 mm depth from the outer circumferential surface in the axial direction of the hole and a position of a 20 ?m depth from the surface of the hole by the formula (A): ??=(R1?R)/R1×100.
    Type: Application
    Filed: September 20, 2017
    Publication date: June 11, 2020
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Tatsuya IWASAKI, Koji WATARI, Hidekazu SUENO
  • Publication number: 20140182414
    Abstract: There is provided an induction hardening steel excellent in quenching crack resistance. The induction hardening steel of the present embodiment includes, by mass percent, C: 0.35 to 0.6%, Si: at least 0.01% and less than 0.40%, Mn: 1.0 to 2.0%, S: more than 0.010% and at most 0.05%, Cr: 0.01 to 0.5%, Al: 0.001 to 0.05%, N: Ti/3.4 to 0.02%, and Ti: 0.005 to 0.05%, the balance being Fe and impurities, and satisfies the following formula (1): 2S-3Ti<0.040??(1) where, into each element symbol in formula (1), the content (mass %) of the corresponding element is substituted.
    Type: Application
    Filed: July 4, 2012
    Publication date: July 3, 2014
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Kisung Kim, Hiroaki Tahira, Kaori Kawano, Koji Watari
  • Publication number: 20090173437
    Abstract: [Problem] It is an object to provide a joining method, whereby even ceramics having an extremely small dielectric loss factor such as aluminum nitride can be joined efficiently and tightly. [Means for Resolution] A method of joining ceramics of the present invention is a method of heating ceramics of the same kind or different kinds by inducing self-heating of the ceramics by electromagnetic wave irradiation and thereby joining the ceramics together, and includes preheating a surface to be joined of the ceramic by a heating means that includes an auxiliary heating means other than the self-heating.
    Type: Application
    Filed: March 27, 2007
    Publication date: July 9, 2009
    Inventors: Yukihiro Kanechika, Masanobu Azuma, Masaki Yasuoka, Koji Watari
  • Publication number: 20090155625
    Abstract: [Problem] It is an object to provide a joining method that enables to join aluminum nitride sinters together efficiently and tightly. [Means for solution] A method of joining an aluminum nitride sinter includes placing an inclusion including a sintering aid between a surface to be joined of one aluminum nitride sinter and a surface to be joined of the other aluminum nitride sinter, and heating the inclusion by electromagnetic wave irradiation, thereby joining the aluminum nitride sinters together.
    Type: Application
    Filed: March 29, 2007
    Publication date: June 18, 2009
    Inventors: Yukihiro Kanechika, Masanobu Azuma, Masaki Yasuoka, Koji Watari
  • Patent number: 7459178
    Abstract: A process for producing a ceramic sinter or inorganic film in which anisotropic particles or anisotropic crystals have been oriented; or a process for producing a bonded composite material which comprises a base sample and another material tenaciously bonded to a surface of the base. The processes are characterized by imposing a centrifugal force during buming (heating).
    Type: Grant
    Filed: November 5, 2002
    Date of Patent: December 2, 2008
    Assignees: National Institute of Advanced Industrial Science and Technology, Sinto V-Cerax, Ltd.
    Inventors: Koji Watari, Kazuo Nakamura, Kimiyasu Sato, Yoshiaki Kinemuchi, Shoji Uchimura, Hirohide Ishiguro, Hideki Morimitsu
  • Patent number: 7267808
    Abstract: The present invention is to produce an aluminum nitride powder which is turned into a sintered body at a temperature of not more than 1600° C., thereby obtaining a sintered aluminum nitride in which the density and thermal conductivity are high and which can be properly used as a substrate material. Using a vapor phase reaction apparatus shown in FIG. 1, ammonia gas was fed from a reactor 2 heated at from 300 to 500° C. and maintained at that temperature by a heating section 1 via a feeding tube 4 while being regulated by a flow regulator 3. At the same time, while being regulated by the flow regulator 5, nitrogen gas containing an organic aluminum compound is fed via a feeding tube 6 to obtain an aluminum nitride powder. The aluminum nitride powder is subjected to a heat treatment at from 1100 to 1500° C. in a reducing gas atmosphere and/or an inert gas atmosphere to obtain an aggregate aluminum nitride powder.
    Type: Grant
    Filed: July 6, 2005
    Date of Patent: September 11, 2007
    Assignees: Mitsui Chemicals, Inc., Advanced Industrial Science and Technology
    Inventors: Masato Yamazaki, Kenshi Mitsuishi, Isao Harada, Masao Tanaka, Kohichi Haruta, Koji Watari, Jin-yu Qiu, Yuji Hotta, Kimiyasu Sato
  • Publication number: 20060055092
    Abstract: The present invention provides a rotor, a shaft or a sample holder for a centrifugal sintering system, and the present invention relates to a ceramic member for a centrifugal sintering system which is a member consisting of a rotor, a shaft or a sample holder for use in a centrifugal sintering system imparting a centrifugal force field and a temperature field to a molded body of ceramics or metal powder or a ceramic precursor film wherein a rotor for turning a sample holder, a shaft or a sample holder is composed of ceramics, to the ceramic member wherein the rotor which turns the sample holder is composed of conductive silicon carbide ceramics and the rotor alone is selectively caused to self heat by induction heating means to indirectly heat the sample, and to the ceramic member wherein the sample holder is composed of a material with a large dielectric loss and the sample holder alone is selectively heated using dielectric heating means to indirectly heat the sample.
    Type: Application
    Filed: December 25, 2003
    Publication date: March 16, 2006
    Applicants: NATIONAL INSTIT OF ADVANCE INDUST SCIENCE AND TECH, SINTO V-CERAX , LTD.
    Inventors: Koji Watari, Yoshiaki Kinemuchi, Shoji Uchimura, Hirohide Ishiguro, Hideki Morimitsu
  • Publication number: 20060018818
    Abstract: The present invention is to produce an aluminum nitride powder which is turned into a sintered body at a temperature of not more than 1600° C., thereby obtaining a sintered aluminum nitride in which the density and thermal conductivity are high and which can be properly used as a substrate material. Using a vapor phase reaction apparatus shown in FIG. 1, ammonia gas was fed from a reactor 2 heated at from 300 to 500° C. and maintained at that temperature by a heating section 1 via a feeding tube 4 while being regulated by a flow regulator 3. At the same time, while being regulated by the flow regulator 5, nitrogen gas containing an organic aluminum compound is fed via a feeding tube 6 to obtain an aluminum nitride powder. The aluminum nitride powder is subjected to a heat treatment at from 1100 to 1500° C. in a reducing gas atmosphere and/or an inert gas atmosphere to obtain an aggregate aluminum nitride powder.
    Type: Application
    Filed: July 6, 2005
    Publication date: January 26, 2006
    Applicants: MITSUI CHEMICALS, INC., NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
    Inventors: Masato Yamazaki, Kenshi Mitsuishi, Isao Harada, Masao Tanaka, Kohichi Haruta, Koji Watari, Jin-yu Qiu, Yuji Hotta, Kimiyasu Sato
  • Publication number: 20050025658
    Abstract: The invention provides a low-carbon free cutting steel containing no lead and is at least comparable in machinability to the conventional leaded free cutting steels and composite free cutting steels and furthermore has excellent finished surface characteristics. The steel is a low-carbon free cutting steel which comprises, on the percent by mass basis, C: 0.05 to under 0.20%, Mn: 0.4-2.0%, S: 0.21-1.0%, Ti: 0.002-0.10%, P: 0.001-0.30%, Al: not higher than 0.2%, 0: 0.001-0:03% and N: 0.0005-0.02%, with the balance being Fe and impurities, and which satisfies the relations (a) and (b) given below concerning the inclusions contained in the steel: (A+B)/C?0.
    Type: Application
    Filed: July 27, 2004
    Publication date: February 3, 2005
    Applicant: Sumitomo Metal Industries, Ltd.
    Inventors: Naoki Matsui, Takayuki Nishi, Toru Kato, Koji Watari, Tatsuya Hasegawa
  • Publication number: 20050006022
    Abstract: A process for producing a ceramic sinter or inorganic film in which anisotropic particles or anisotropic crystals have been oriented; or a process for producing a bonded composite material which comprises a base sample and another material tenaciously bonded to a surface of the base. The processes are characterized by imposing a centrifugal force during buming (heating).
    Type: Application
    Filed: November 5, 2002
    Publication date: January 13, 2005
    Inventors: Koji Watari, Kazuo Nakamura, Kimiyasu Sato, Yoshiaki Kinemuchi, Shoji Uchimura, Hirohide Ishiguro, Hideki Morimitsu
  • Patent number: 6838048
    Abstract: A steel for machine structural use which comprises, on the percent by mass basis, C: 0.1 to 0.6%, Si: 0.01 to 2.0%, Mn: 0.2 to 2.0%, S: 0.005 to 0.20%, P: not more than 0.1%, Ca: 0.0001 to 0.01%, N: 0.001 to 0.02% and Al: not more than 0.1%, with the balance being Fe and impurities, with a value of [Ca]e defined by [Ca]e=T.[Ca]?(T.[O]/(O)ox)×(Ca)ox of not more than 5 ppm or with a proportion of MnO contained in oxide inclusions of not more than 0.05 and a value of Ca/O of not more than 0.8 is excellent in machinability and, therefore, it can be used as a steel stock for various machine structural steel parts, such as in industrial machinery, construction machinery and conveying machinery such as automobiles. It is substantially free of Pb, hence suited for use as a steel friendly to the global environment. [Ca]e is the effective Ca concentration index (ppm by mass), T.[Ca] and T.
    Type: Grant
    Filed: September 30, 2002
    Date of Patent: January 4, 2005
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventors: Takayuki Nishi, Hitoshi Matsumoto, Toru Kato, Koji Watari, Naoki Matsui, Hiroaki Tahira
  • Publication number: 20040247855
    Abstract: It is an object to provide a method of manufacturing a porous medium having a grading porous structure, and there are provided a method of manufacturing a porous medium having a grading porous structure, comprising the steps of installing a sample consisting of a powder compact or a porous body in a rotating body, and heating the sample while applying a centrifugal force to the sample through high-speed rotation of the rotating body to produce a porous medium having a grading porous structure in which the pore size and the porosity change gradually by using the pressure grading in the sample arising through the centrifugal force, and such a method wherein the pore size and the porosity of the sample are predicted based on a linear shrinkage factor calculated through the equation:
    Type: Application
    Filed: December 4, 2003
    Publication date: December 9, 2004
    Applicants: National Inst. of Adv. Industrial Sci. and Tech., Sinto V-Cerax, LTD
    Inventors: Yoshiaki Kinemuchi, Koji Watari, Shoji Uchimura, Hirohide Ishiguro, Hideki Morimitsu
  • Patent number: 6797231
    Abstract: The invention provides a steel for machine structural use, which is excellent in machinability, comprising, in percent by mass, C: 0.1-0.6%. Si: 0.01-2.0%, Mn: 0.2-2.0%, S: 0.005-0.2%, Al: not more than 0.009%, Ti: not less than 0.001% but less than 0.04%, Ca: 0.0001-0.01%, O (oxygen): 0.0010-0.01%, and N: not more than 0.02% and satisfying the following relations (1) to (3): n0/S (%)≧2500  (1) n1/n0≦0.1  (2) n2≧10  (3) where n0: total number of sulfide inclusions not smaller than 1 &mgr;m per mm2 of a cross section parallel to the direction of rolling (number/mm2); n1: number of MnS inclusions having not smaller than 1 &mgr;m and containing not less than 1.
    Type: Grant
    Filed: November 15, 2002
    Date of Patent: September 28, 2004
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventors: Naoki Matsui, Koji Watari, Takayuki Nishi, Toru Kato, Hitoshi Matsumoto, Hiroaki Tahira
  • Publication number: 20040037731
    Abstract: By limiting steel compositions with respect to special components and controlling contents of Ti, Zr and S in a steel to a suitable range, fine Ti and Zr sulfides are generated so that a cast steel having excellent internal quality and machinability after casting can be ensured. Then, by casting this cast steel a mold having excellent machinability, whose internal quality as cast is comparable to that of a forged steel product, can be produced. Therefore, the mold of the present invention can be widely applied to use, which severely requires excellent surface properties in products for deep-engraving in which a worked surface reaches the internal portion of the section material or for finishing.
    Type: Application
    Filed: September 2, 2003
    Publication date: February 26, 2004
    Inventors: Yasutaka Okada, Koji Watari
  • Patent number: 6663828
    Abstract: A method and an apparatus for sintering a compact of particulate material for a ceramic or of particles of a metal, or a ceramic precursor film, wherein the sintering is performed by heating and burning the compact or the ceramic precursor film while applying centrifugal force to the compact or the ceramic precursor film.
    Type: Grant
    Filed: December 21, 2001
    Date of Patent: December 16, 2003
    Assignees: National Institute of Advanced Industrial Science and Technology, Sinto V-Cerax, Ltd.
    Inventors: Koji Watari, Mamoru Aizawa, Syoji Uchimura, Hirohide Ishiguro, Hideki Morimitsu
  • Publication number: 20030152476
    Abstract: The invention provides a low-carbon resulfurized free cutting steel containing no lead and at least comparable in machinability to the conventional leaded free cutting steels. The steel consists of, by mass percent, C: 0.05-0.19%, Mn: 0.4-2.0%, S: 0.21-1.0%, Ti: 0.03-0.30%, Si: not more than 1.0%, P: 0.001-0.3%, Al: not more than 0.2%, O (oxygen): 0.0010-0.050% and N: 0.0001-0.
    Type: Application
    Filed: February 4, 2003
    Publication date: August 14, 2003
    Applicant: Sumitomo Metal Industries, Ltd.
    Inventors: Naoki Matsui, Yasutaka Okada, Koji Watari
  • Publication number: 20030138343
    Abstract: The invention provides a steel for machine structural use, which is excellent in machinability, comprising, in percent by mass, C: 0.1-0.6%, Si: 0.01-2.0%, Mn: 0.2-2.0%, S: 0.005-0.2%, Al: not more than 0.009%, Ti: not less than 0.001% but less than 0.04%, Ca: 0.0001-0.01%, O (oxygen): 0.001-0.01%, and N: not more than 0.
    Type: Application
    Filed: November 15, 2002
    Publication date: July 24, 2003
    Inventors: Naoki Matsui, Koji Watari, Takayuki Nishi, Toru Kato, Hitoshi Matsumoto, Hiroaki Tahira
  • Publication number: 20030084965
    Abstract: A steel for machine structural use which comprises, on the percent by mass basis, C: 0.1 to 0.6%, Si: 0.01 to 2.0%, Mn: 0.2 to 2.0%, S: 0.005 to 0.20%, P: not more than 0.1%, Ca: 0.0001 to 0.01%, N: 0.001 to 0.02% and Al: not more than 0.1%, with the balance being Fe and impurities, with a value of [Ca]e defined by [Ca]e=T.[Ca]−(T.[O]/(O)ox)×(Ca)ox of not more than 5 ppm or with a proportion of MnO contained in oxide inclusions of not more than 0.05 and a value of Ca/O of not more than 0.8 is excellent in machinability and, therefore, it can be used as a steel stock for various machine structural steel parts, such as in industrial machinery, construction machinery and conveying machinery such as automobiles. It is substantially free of Pb, hence suited for use as a steel friendly to the global environment. [Ca]e is the effective Ca concentration index (ppm by mass), T.[Ca] and T.
    Type: Application
    Filed: September 30, 2002
    Publication date: May 8, 2003
    Applicant: SUMITOMO METAL INDUSTRIES, LTD.
    Inventors: Takayuki Nishi, Hitoshi Matsumoto, Toru Kato, Koji Watari, Naoki Matsui, Hiroaki Tahira