Patents by Inventor Isao Shibuya

Isao Shibuya 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: 10510471
    Abstract: A composition for bonded magnets according to the present invention contains from 88% by mass to 91% by mass (inclusive) of a samarium-iron-nitrogen magnet powder having an average particle diameter of from 1.8 ?m to 2.8 ?m (inclusive), from 0.5% by mass to 2.5% by mass (inclusive) of a polyamide elastomer having a tensile elongation at break of 400% or more and a bending modulus of elasticity of 100 MPa or more, from 0.5% by mass to 2.0% by mass (inclusive) of carbon fibers having fiber diameters of from 10 ?m to 12 ?m (inclusive) and from 0.3% by mass to 1.0% by mass (inclusive) of a carboxylic acid ester, with the balance made up of a polyamide resin which is composed of a polyamide 12 having a weight average molecular weight (Mw) of from 4,500 to 7,500 (inclusive) as determined by molecular weight distribution measurement.
    Type: Grant
    Filed: July 9, 2015
    Date of Patent: December 17, 2019
    Assignees: SUMITOMO METAL MINING CO., LTD., MABUCHI MOTOR CO., LTD.
    Inventors: Hideki Matsuda, Kenji Muraoka, Toshiya Iwai, Junichi Ishii, Atsushi Kawamoto, Naoki Kitahara, Isao Shibuya, Yasuhiro Yamagata
  • Publication number: 20170178774
    Abstract: A composition for bonded magnets according to the present invention contains from 88% by mass to 91% by mass (inclusive) of a samarium-iron-nitrogen magnet powder having an average particle diameter of from 1.8 ?m to 2.8 ?m (inclusive), from 0.5% by mass to 2.5% by mass (inclusive) of a polyamide elastomer having a tensile elongation at break of 400% or more and a bending modulus of elasticity of 100 MPa or more, from 0.5% by mass to 2.0% by mass (inclusive) of carbon fibers having fiber diameters of from 10 ?m to 12 ?m (inclusive) and from 0.3% by mass to 1.0% by mass (inclusive) of a carboxylic acid ester, with the balance made up of a polyamide resin which is composed of a polyamide 12 having a weight average molecular weight (Mw) of from 4,500 to 7,500 (inclusive) as determined by molecular weight distribution measurement.
    Type: Application
    Filed: July 9, 2015
    Publication date: June 22, 2017
    Inventors: Hideki Matsuda, Kenji Muraoka, Toshiya Iwai, Junichi Ishii, Atsushi Kawamoto, Naoki Kitahara, Isao Shibuya, Yasuhiro Yamagata
  • Patent number: 6407228
    Abstract: A simple and efficient method is proposed for the preparation of a &bgr;-lactam compound such as 1-phenyl-4-ethoxy-2-azetidinone which can be produced by mixing an isocyanate compound such as phenyl isocyanate and a vinyl ether compound such as ethyl vinyl ether and heating the mixture at a moderate temperature under a superatmospheric pressure of up to 12000 atmospheres.
    Type: Grant
    Filed: September 12, 1995
    Date of Patent: June 18, 2002
    Assignee: Japan as represented by Director General of Agency of Industrial Science and Technology
    Inventors: Yoichi Taguchi, Akihiro Oishi, Isao Shibuya, Tohru Tsuchiya
  • Patent number: 6245166
    Abstract: An object of the present invention is to provide a material for a sliding contact whose alloy composition does not contain an environmentally detrimental substance such as Cd, which exhibits excellent contact resistance, whose electrical functions are good and free of time-course variation, and which further exhibits excellent wear resistance. The material for a sliding contact assumes the form of an Ag—Zn—Pd, Ag—Zn—Pd—Cu, Ag—Zn—Pd—Ni, or Ag—Zn—Pd—Cu—Ni alloy. In the compositions of these alloys, the Zn content is 0.1-3.0% by weight, the Pd content is 0.1-1.5% by weight, and the balance is Ag. When Cu is contained, the Cu content is 0.1-3.0% by weight. When Ni is contained, the Ni content is 0.01-0.5% by weight. Zn, Pd, and Cu are present in the Ag &agr; phase in the form of solid solution. Ni particles are finely dispersed in the alloys. A composite clad material is formed through use of the material for a sliding contact.
    Type: Grant
    Filed: December 21, 1999
    Date of Patent: June 12, 2001
    Assignees: Mabuchi Motor Co., Ltd, Tanaka Kikinozoku Kogyo K.K.
    Inventors: Isao Shibuya, Keiji Nakamura, Kenji Shiraki, Toshiya Yamamoto, Takao Asada
  • Patent number: 6225265
    Abstract: In a miniature electric motor with reduction worm gear unit, a reduction worm gear unit is mounted on a motor portion and an output of the motor portion is subjected to a speed reduction through the unit. In lubricant for lubricating worm gears of the unit, fine silica grain is added and mixed to base oil, and a content of the fine silica grain is in a range of about 3 to about 10 wt. %. It is possible to always maintain reverse rotation proof while always keeping a desired gear transmission efficiency in a wide environmental temperature range. As a result, it is possible to miniaturize a motor and also to increase a life cycle number to prolong service life of the motor. The motor may be applied to an electric window device of an automotive vehicle.
    Type: Grant
    Filed: May 12, 1999
    Date of Patent: May 1, 2001
    Assignee: Mabuchi Motor Co., Ltd.
    Inventors: Isao Shibuya, Junya Kurata
  • Patent number: 5972131
    Abstract: An Ag--Cu alloy for a sliding contact containing:a) 0.1 to 8.0 wt. % of Cu, based on the weight of the alloy, wherein at least 70 wt. % of the Cu contained in the alloy is solid-solubilized in an Ag-.alpha.-phase; andb) 0.1 to 4.0 wt. %, based on the weight of the alloy, of at least one metal selected from the group consisting of Ge, Ni, Sn, In, Zn, Mg, Mn, Sb, Pb and Bi.The Ag--Cu alloy is desirably utilized to form a composite with a Cu or Cu alloy base material. Such composite has been found to be very useful for fabricating the commutator of a compact DC motor.
    Type: Grant
    Filed: November 14, 1997
    Date of Patent: October 26, 1999
    Assignees: Tanaka Kikinzoku Kogyo K.K., Mabuchi Motor Co., Ltd.
    Inventors: Takao Asada, Keiji Nakamura, Isao Shibuya, Toshiya Yamamoto, Tetsuya Nakamura, Kiyoshi Nakama
  • Patent number: 5876862
    Abstract: Sliding contacts comprising alloys such as Pd/Cu/Ag, Pt/Cu/Ag, Pd/Cu/Ag/Ni, Pt/Cu/Ag/Ni, Ag/Pd/Cu,Au, Ag/Pt/Cu/Au and two-layered composites comprising a surface layer of one of the foregoing alloys and a base layer comprised of copper or a copper-containing alloy. Also, three-layered composites comprising a surface layer of one of the foregoing alloys, an intermediate layer of one of the foregoing alloys and a base layer comprised of copper or a copper-containing alloy as well as direct current motors comprising commutators comprising a three-layered composite.
    Type: Grant
    Filed: May 6, 1997
    Date of Patent: March 2, 1999
    Assignees: Mabuchi Motor Co., Ltd., Tanaka Kikinzoku Kogyo K.K.
    Inventors: Isao Shibuya, Toshiya Yamamoto, Takao Asada, Tetsuya Nakamura
  • Patent number: 5700931
    Abstract: Disclosed is a novel .beta.-lactam compound, a 7-substituted-2-oxa-7-azabicyclo?3.2.0!heptan-6-one represented by the general formula ##STR1## in which R is an alkyl, cycloalkyl, aryl, halogen-substituted aryl or alkaryl group, having usefulness as an intermediate for the synthesis of various biologically active compounds. The compound can be prepared by the reaction of an isocyanate compound RNCO, R being the same as above, and 2,3-dihydrofuran, preferably, under pressurization up to 2000 atmospheres or higher.
    Type: Grant
    Filed: May 29, 1996
    Date of Patent: December 23, 1997
    Assignee: Japan as represented by Director General of Agency of Industrial Science and Technology
    Inventors: Yoichi Taguchi, Akihiro Oishi, Isao Shibuya, Tohru Tsuchiya
  • Patent number: 5677444
    Abstract: A novel and simple method is proposed for the synthetic preparation of an N,N-disubstituted .beta.-ketothioamide compound represented by the general formulaR.sup.1 R.sup.2 N--CS--CH.sub.2 --CO--R.sup.3,in which R.sup.1 and R.sup.2 are each a monovalent hydrocarbon group or each a divalent hydrocarbon group jointly forming a cyclic structure together with the nitrogen atom and R.sup.3 is a hydrogen atom, a monovalent hydrocarbon group or a divalent hydrocarbon group forming a cyclic structure jointly with R.sup.1, R.sup.1 being a divalent hydrocarbon group and R.sup.2 being a monovalent hydrocarbon group. The method comprises:(a) mixing an N,N-disubstituted amide compound represented by the general formulaR.sup.1 R.sup.2 N--CO--R.sup.3,and a bis(trialkylsilyl)thioketene compound represented by the general formula(R.sub.3 Si).sub.2 C.dbd.C.dbd.
    Type: Grant
    Filed: September 15, 1995
    Date of Patent: October 14, 1997
    Assignee: Japan as represented by Director General of Agency of Industrial Science and Technology
    Inventors: Tohru Tsuchiya, Isao Shibuya, Yoichi Taguchi, Akihiro Oishi, Kazumasa Honda
  • Patent number: 5585487
    Abstract: Disclosed is a method for the preparation of a .beta.-thiolactam compound, i.e. a 7-substituted-2-oxa-7-azabicyclo [3.2.0]-heptan-6-thione, represented by the general formula ##STR1## in which R is an alkyl or aryl group, having usefulness as an intermediate for the synthesis of various biologically active compounds. The compound can be prepared by the reaction of an isothiocyanate compound R--NCS, R being the same as above, and 2,3-dihydrofuran, preferably, under pressurization up to 2000 atmospheres or higher at an elevated temperature.
    Type: Grant
    Filed: March 8, 1996
    Date of Patent: December 17, 1996
    Assignee: Japan as represented by Director General of Agency of Industrial Science and Technology
    Inventors: Akihiro Oishi, Yoichi Taguchi, Isao Shibuya, Tohru Tsuchiya
  • Patent number: 5550230
    Abstract: Disclosed is a novel .beta.-lactam compound, a 7-substituted-2-oxa-7-azabicyclo[3.2.0]heptan-6-one represented by the general formula ##STR1## in which R is an alkyl, cycloalkyl, aryl, halogen-substituted aryl or alkaryl group, having usefulness as an intermediate for the synthesis of various biologically active compounds. The compound can be prepared by the reaction of an isocyanate compound RNCO, R being the same as above, and 2,3-dihydrofuran, preferably, under pressurization up to 2000 atmospheres or higher.
    Type: Grant
    Filed: March 1, 1995
    Date of Patent: August 27, 1996
    Assignee: Japan as represented by Director General of Agency of Industrial Science and Technology
    Inventors: Yoichi Taguchi, Akihiro Oishi, Isao Shibuya, Tohru Tsuchiya
  • Patent number: 5502343
    Abstract: A miniature motor comprising a case made of a metallic material, formed into a bottomed hollow tubular shape and having a permanent magnet fixedly fitted to the inner circumferential surface thereof, a rotor having an armature facing the permanent magnet and a commutator, and a case cap fitted to an open end of the case, and having brushes for making sliding contact with the commutator and input terminals electrically connected to the brushes; the rotor being rotatably supported by bearings provided on the bottom of the case and the case cap, in which an internal space defined by the case and the case cap is filled with an atmosphere of a polymer having a weight-average molecular weight of 50-5000.
    Type: Grant
    Filed: June 16, 1994
    Date of Patent: March 26, 1996
    Assignee: Mabuchi Motor Co., Ltd.
    Inventors: Kazutoshi Yoshimura, Kenji Hagiwara, Isao Shibuya
  • Patent number: 5357159
    Abstract: A miniature motor comprising a case made of a metallic material, formed into a bottomed hollow cylindrical shape and having permanent magnets on the inner circumferential surface thereof, a rotor consisting of an armature facing the permanent magnets and a commutator, and a case cap fitted to an open end of the case and having brushes making sliding contact with the commutator and input terminals electrically connected to the brushes; the rotor being rotatably supported by bearings provided on the bottom of the case and the case cap, in which an internal space defined by the case and the case cap is filled with an atmosphere of one or more than two types of polymethacrylate, polyacrylate, polyisobutylene, low molecular weight polyethylene, low molecular weight polypropylene, ethylene-propylene copolymer, polyvinyl acetate, and polybutene.
    Type: Grant
    Filed: June 16, 1993
    Date of Patent: October 18, 1994
    Assignee: Mabuchi-Motor Co., Ltd.
    Inventors: Kenji Hagiwara, Isao Shibuya, Kazutoshi Yoshimura
  • Patent number: 5270596
    Abstract: A miniature d-c motor comprising a case on the inner circumferential surface of which a permanent magnet is mounted, a rotor consisting of an armature and a commutator, and a case cap on which brushes and input terminals are mounted; the rotor being supported via bearings provided on the case and the case cap, in which the miniature d-c motor is housed in a hermetically-sealed internal space defined by the hermetic case formed into a bottomed hollow cylindrical shape and the hermetic case cap fitted to an open end of the hermetic case, and an output shaft connected to a rotor shaft via a magnetic coupling is rotatably provided outside the bottom of the hermetic case.
    Type: Grant
    Filed: July 28, 1992
    Date of Patent: December 14, 1993
    Assignee: Mabuchi Motor Co., Ltd.
    Inventors: Isao Shibuya, Kenji Hagiwara, Kazutoshi Yoshimura, Kenji Tsuyama
  • Patent number: 5227689
    Abstract: A metal-filled gaphite brush used for a miniature motor, which has a permanent magnet field and is caused to rotate through current commutation via a commutator, formed by bonding graphite powder and used for making sliding contact with the commutator for current commutation, in which the metal-filled graphite brush is formed by pressure-forming and sintering a mixture of highly purified graphite powder and metal powder; the graphite powder used for the metal-filled graphite brush being purified to reduce the ash content thereof 0.05 wt. %, and the method of making the same.
    Type: Grant
    Filed: August 7, 1990
    Date of Patent: July 13, 1993
    Assignee: Mabuchi Motor Co., Ltd.
    Inventor: Isao Shibuya
  • Patent number: 5144181
    Abstract: A carbon brush for miniature motors comprising a stator using a permanent magnet as the field, and a rotor on which a rotor winding is wound, and having a commutator for feeding current to the rotor winding and brushes, formed by bonding graphite powder, for making sliding contact with the commutator; the brush being a metal-plated graphite brush formed by adding 0.1 wt. % to 12.0 wt. % of a fibrous material of particle sizes less than 40 microns and lengths less than 50 microns to metal-plated graphite powder formed by coating graphite powder with a metallic layer, and pressure-forming and sintering a mixture of the metal-plated graphite powder and the fibrous material; the graphite powder containing less than 0.05 wt. % of ashes, and the method of making the same.
    Type: Grant
    Filed: March 14, 1991
    Date of Patent: September 1, 1992
    Assignee: Mabuchi Motor Co., Ltd.
    Inventor: Isao Shibuya
  • Patent number: 5138053
    Abstract: There is disclosed a method for producing 2,6-bis(disubstituted amino)-1,3,5-thiadiazine-4-one compounds represented by formula (I). The method comprises reacting an N,N-disubstituted cyanamide represented by formula (II) with carbonyl sulfide represented by formula (III) under a high pressure. Formula (I) ##STR1## wherein R.sub.1 and R.sub.2 each represent an alkyl group or R.sub.1 and R.sub.2 may bond together to form a ring, Formula (II) ##STR2## wherein R.sub.1 and R.sub.2 each have the same meanings as in formula (I), Formula (III)S.dbd.C.dbd.O.
    Type: Grant
    Filed: November 15, 1991
    Date of Patent: August 11, 1992
    Assignee: Director-General of Agency of Industrial Science and Technology
    Inventors: Masahiko Yasumoto, Touru Tsuchiya, Yoichi Taguchi, Isao Shibuya, Katsumi Yonemoto
  • Patent number: 5136198
    Abstract: A carbon brush used for a miniature motor, which has a permanent magnet field and is caused to rotate through current commutation via a commutator, formed by bonding graphite powder and used for making sliding contact with the commutator for current commutation, in which the carbon brush is a metal-plated graphite brush formed by pressure-forming and sintering the graphite powder after covering particles of the graphite powder with a metallic layer; the graphite powder used for the metal-plated graphite brush being purified to reduce the ash content of the graphite powder to 0.05 wt. %, and the method of making the same.
    Type: Grant
    Filed: April 5, 1990
    Date of Patent: August 4, 1992
    Assignee: Mabuchi Motor Co., Ltd.
    Inventor: Isao Shibuya
  • Patent number: 5089612
    Abstract: There is disclosed a novel thiadiazine, 2,6-bis(disubstituted amino)-4-dialkylthiocarbamoylimino-1,3,5-thiadiazine, and method for preparing same. According to the disclosure a compound useful for a medicine and agricultural chemical can be obtained efficiently by a one-step reaction using inexpensive raw materials.
    Type: Grant
    Filed: February 28, 1990
    Date of Patent: February 18, 1992
    Assignee: Director General of Agency of Industrial Science and Technology
    Inventors: Masahiko Yasumoto, Tohru Tsuchiya, Isao Shibuya, Midori Goto