Patents by Inventor Osamu Ozawa

Osamu Ozawa 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: 5549463
    Abstract: A composite dry vacuum pump of this invention has closed chambers accommodating a pair of screw rotors and a pair of roots rotors respectively mounted coaxially to the front ends of the screw rotors. The roots rotors and the screw rotors are rotated at the same speed in opposite directions by a motor to aspirate fluids from a suction port on one end wall and discharge the fluid through a discharge port on the outer surface of the other end wall. The characteristics of power requirement of the portion of the roots rotors and that of the portion of the screw rotors changes inversely to the suction port pressure variation, therefore the characteristic of the total power requirement of the pump of this invention is almost flat over the all pressure range and the motor having smaller output power can operate the pump according to the present invention.
    Type: Grant
    Filed: March 3, 1995
    Date of Patent: August 27, 1996
    Assignee: Kashiyama Industry Co., Ltd.
    Inventor: Osamu Ozawa
  • Patent number: 5443644
    Abstract: A gas exhaust system for use in a semiconductor manufacturing process wherein mechanical or chemical processing is applied on silicon wafers or the like arranged in a air-tight process chamber thereof, comprises a vacuum chamber having a gas suction port formed on an upper side thereof and a gas exhaust port formed on a lower side thereof. In the vacuum chamber, the first and second rotors are arranged vertically and supported rotatably at their lower end port ions in a cantilevered condition. The first and second rotors are driven to rotate in the opposite directions to thereby form a certain degree of vacuum condition in the vacuum chamber, whereby the residual gasses in the process chamber are discharged therefrom through the gas exhaust system.
    Type: Grant
    Filed: March 15, 1994
    Date of Patent: August 22, 1995
    Assignee: Kashiyama Industry Co., Ltd.
    Inventor: Osamu Ozawa
  • Patent number: 5393844
    Abstract: Rubber compositions having high tensile modulus at 100% and strong metal adhesion. The rubber compositions include chlorinated polyethylene rubber and/or its derivative reformed with maleic anhydride with from 0.2 to 10 parts by weight per 100 parts of the rubber of a 2,4,6-trimercapto-1,3,5-triazine dicyclohexylamine salt.
    Type: Grant
    Filed: June 21, 1993
    Date of Patent: February 28, 1995
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Osamu Ozawa, Tetsu Kitami
  • Patent number: 5380571
    Abstract: A hose including at least an inner tube, a reinforcing layer and an outer cover, wherein the inner tube and the outer cover are individually composed of a thermoplastic elastomer comprising a vulcanized rubber dispersed in a thermoplastic resin, M.sub.p defined by the following formula (I) is not greater than 70 kgf/cm.sup.2, and flexural rigidity of the hose at a bending radius four times the outer diameter of the hose is 1 kgf or less: ##EQU1## wherein t.sub.1 and t.sub.2 are the thickness of the inner tube and the outer tube (mm), respectively, and M.sub.1 and M.sub.2 are stress (kgf/cm.sup.2) at 25% elongation of the inner tube and the outer cover, respectively.
    Type: Grant
    Filed: June 17, 1993
    Date of Patent: January 10, 1995
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Osamu Ozawa, Hiroyuki Miyade, Tetsu Kitami
  • Patent number: 5362530
    Abstract: A composite hose is disclosed which is constructed essentially with an inner tube and an outer cover, the inner tube being formed from a composition comprised of a specified polymer alloy of a selected class of polyamide resins and acrylic rubbers and the outer cover from a composition comprised of a specified thermoplastic elastomer of a selected class of polyolefin resins and ethylene-propylene-diene rubbers and butyl-based rubber. Impermeability is greatly improved with respect to refrigerant gases and fuel oils.
    Type: Grant
    Filed: December 9, 1993
    Date of Patent: November 8, 1994
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Tetsu Kitami, Osamu Ozawa, Jun Mito
  • Patent number: 5319035
    Abstract: Rubber compositions are disclosed which are formulated to provide high modulus at 100% and strong adhesion to metal. Chlorinated polyethylene rubber and/or its derivative reformed with maleic anhydride is blended with specified amounts of a 2-mercaptobenzothiazole dicyclohexylamine salt, trithiocyanuric acid and sufur such that formulae (1) and (2) are met ##EQU1## where phr is defined as the amount in parts of the component per hundred parts of component (A) or component (B) or both.
    Type: Grant
    Filed: May 9, 1991
    Date of Patent: June 7, 1994
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Osamu Ozawa, Tetsu Kitami
  • Patent number: 5316046
    Abstract: High performance hoses are disclosed which are characterized by enhanced heat resistance, leading to prolonged service life, and hence are suitable for use in automobile power steering units. Inner tubes are formed of hydrogenated acrylonitrile/butadiene copolymer rubbers of a selected composition. The inner tubes may be of a double-layered construction composed of an inner layer of hydrogenated acrylonitrile/butadiene copolymer rubber and an outer layer of rubber composition which comprises specified amounts of a selected class of sulfurs, organic peroxide and triazine compounds combined with selected sulfur-curable base rubbers.
    Type: Grant
    Filed: September 17, 1992
    Date of Patent: May 31, 1994
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Shigeru Igarashi, Osamu Ozawa
  • Patent number: 5297337
    Abstract: Rubber compositions are disclosed for integral attachment of polymeric and metallic materials. Improved bondability is attributed to the use of a selected base rubber blended with a selected class of inorganic or organic fillers, silane compounds and vulcanizing agents such that the finished composition is provided with a specified range of Mooney viscosities. Also disclosed is a method of hose-metal fitting connection by the application of the composition. Gas- and oil-impermeability characteristics are greatly enhanced.
    Type: Grant
    Filed: June 9, 1992
    Date of Patent: March 29, 1994
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Shigeru Igarashi, Osamu Ozawa, Tetsu Kitami
  • Patent number: 5296555
    Abstract: Rubber compositions are disclosed which are tailored to exhibit high adhesion to brass, sufficient resistance to heat and to oil and great elasticity. A selected class of highly hydrogenated acrylonitrile copolymer rubbers are blended with specified amounts of a selected class of trially isocyanurate compounds, organic sulfur-containing compounds or sulfur donors and organic peroxides. Also disclosed is a hose built with an inner tube formed from the above rubber composition and a reinforcing layer from a pressure-resistant, metallic wire plated with brass.
    Type: Grant
    Filed: May 27, 1993
    Date of Patent: March 22, 1994
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventor: Osamu Ozawa
  • Patent number: 5158113
    Abstract: A hose is disclosed which is characterized by enhanced durability against severe pressure and temperature conditions and by improved coupler attachment without bulging. The hose has a multi-layered inner tube including an inner wall and an outer wall formed respectively of a selected class of rubbers. Both walls are so structured as to satisfy specified modulus and thickness characteristics.
    Type: Grant
    Filed: June 17, 1991
    Date of Patent: October 27, 1992
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Osamu Ozawa, Takashi Sato
  • Patent number: 5149732
    Abstract: Rubber compositions are disclosed for integral attachment of polymeric and metallic materials. Improved bondability is attributed to the use of a selected base rubber blended with a selected class of inorganic or organic fillers, silane compounds and vulcanizing agents such that the finished composition is provided with a specified range of Mooney viscosities. Also disclosed is a method of hose-metal fitting connection by the application of the composition. Gas- and oil-impermeability characteristics are greatly enhanced.
    Type: Grant
    Filed: March 6, 1990
    Date of Patent: September 22, 1992
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Shigeru Igarashi, Osamu Ozawa, Tetsu Kitami
  • Patent number: 5077108
    Abstract: Composite laminates are disclosed which are designed to exhibit superior resistance to oil and to heat and which are comprised essentially of a rubbery layer and a fibrous layer bonded thereover. The rubber layer is formed from a rubber composition made up of highly hydrogenated acrylonitrile-butadiene rubber, an organic peroxide curing agent and magnesium oxide, and the fibrous layer is formed from an organic fiber treated with a dip coating of a specified composition. Also disclosed is a composite hose in which the rubbery layer is utilized as an inner tube and the fibrous layer as a reinforcement.
    Type: Grant
    Filed: November 13, 1989
    Date of Patent: December 31, 1991
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Osamu Ozawa, Shuji Takahashi, Shigeru Igarashi
  • Patent number: 5068137
    Abstract: Composite laminates are disclosed which are designed to exhibit superior resistance to oil and to heat and which are comprised essentially of two different rubbery layers and a fibrous layer interposed therebetween. One rubber layer is formed from a rubber composition made up of highly hydrogenated acrylonitrile-butadiene rubber, an organic peroxide curing agent and magnesium oxide, and the other from a rubber composition of a rubber other than chlosulfonated polyethylene rubber. The fibrous layer is formed from an organic fiber treated with a dip coating of a specified composition. Also disclosed is a composite hose in which the rubbery layers and fibrous layer are assembled.
    Type: Grant
    Filed: November 13, 1989
    Date of Patent: November 26, 1991
    Assignee: The Yokohama Rubber Company
    Inventors: Osamu Ozawa, Shuji Takahashi, Shigeru Igarashi
  • Patent number: 4958316
    Abstract: A static random access memory comprising a semiconductor substrate, a well region formed in the substrate and containing at least one memory cell, and a power-supply terminal connected to the well region, for applying a given bias voltage to the well region.
    Type: Grant
    Filed: December 22, 1988
    Date of Patent: September 18, 1990
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kiyofumi Ochii, Masataka Matsui, Osamu Ozawa
  • Patent number: 4901284
    Abstract: A static random access memory comprising a memory cell array, a plurality of peripheral circuits, first and second power-supply voltage lines, a bonding pad, and a level-shifting circuit. The array has static memory cells each having resistors functioning as load elements. The peripheral circuits control the writing of data into, and the reading of data from, the static memory cells. The first power-supply voltage line applies a first power-supply voltage to the peripheral circuits. The bonding pad is connected to the first power-supply voltage line. The second power-supply voltage line applies a second power-supply voltage to the static memory cells. The level-shifting means is connected between the first and second power-supply voltage lines, for shifting the level of the first power-supply voltage and applying the level-shifted voltage to the static memory cells via said second power-supply voltage line.
    Type: Grant
    Filed: December 22, 1988
    Date of Patent: February 13, 1990
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kiyofumi Ochii, Masataka Matsui, Osamu Ozawa
  • Patent number: 4870995
    Abstract: High performance hose is disclosed which is characterized by enhanced heat resistance, leading to prolonged service life, and hence are suitable for use in automobile power steering units. The inner tube has a double-layered construction composed of an inner layer of hydrogenated acrylonitrile/butadiene copolymer rubber and an outer layer of rubber composition which comprises specified amounts of a selected class of sulfurs, organic peroxide and triazine compounds combined with selected sulfur-curable base rubbers.
    Type: Grant
    Filed: October 11, 1988
    Date of Patent: October 3, 1989
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Shigeru Igarashi, Osamu Ozawa
  • Patent number: 4826925
    Abstract: Rubber compositions are disclosed which are characterized by enhanced adhesion to hydrogenated acrylonitrile-butadiene rubbers and to metallic and fibrous materials, and also be improved modulus at 100% elongation, and hence are suitable particularly for use in tires, belts, molded articles, rubber rolls and hoses. Such physical characteristics are obtained by the use of specified amounts of a selected class of sulfurs, organic peroxides and triazine compounds combined with selected sulfur-curable base rubbers.
    Type: Grant
    Filed: July 13, 1987
    Date of Patent: May 2, 1989
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Osamu Ozawa, Tetsu Kitami
  • Patent number: 4412239
    Abstract: A semiconductor device comprising a semiconductor substrate, a plurality of IIL gates formed in the substrate, each consisting of an inverter transistor and an injector transistor, and polysilicon films of P and N conductivity types connected to each other and formed as electrode layers connected with diffusion layers of P and N conductivity types which are formed on the substrate, respectively.
    Type: Grant
    Filed: April 7, 1980
    Date of Patent: October 25, 1983
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventors: Hiroshi Iwasaki, Osamu Ozawa
  • Patent number: 4385433
    Abstract: An exposed surface of a semiconductor substrate with an integrated injection logic semiconductor region having a first conductivity injector region of which one surface is exposed, a first conductivity type base region of which part of the surface is exposed, and a second conductivity type collector region of which one surface is exposed and the remaining surfaces are surrounded by the base region, is covered with SiO.sub.2. Contact holes are holed in the SiO.sub.2 layer at the locations facing the injector regions, the base regions and the collector region. Through the contact holes, first conductivity type ions are injected into the semiproduct of the semiconductor device. As a result, the surface impurity concentrations of the injector region, the base region and the collector region are 1.times.10.sup.19 /cm.sup.3 or more. Interconnection electrodes of, for example, MoSi.sub.2 make ohmic contact with the respective regions.
    Type: Grant
    Filed: November 7, 1980
    Date of Patent: May 31, 1983
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventor: Osamu Ozawa
  • Patent number: 4377029
    Abstract: A process for fabricating a bipolar integrated circuit comprises the steps of:forming isolation regions in an epitaxial layer of a second conductivity type formed on a semiconductor substrate of a first conductivity type;forming a thermal oxidation layer on the surface of said epitaxial layer;forming a diffusion region of the first conductivity type for a lower part electrode by selectively implanting by ion implantation an impurity of the first conductivity type in a capacitor-forming region of surrounded by said isolation region through said thermal oxidation layer and annealing thereafter;forming a diffusion region of the second conductivity type for an external electrode by selectively diffusing an impurity of the second conductivity type into said capacitor-forming region through a contact hole formed in said thermal oxidation layer; andforming a contact hole for exposing part of said diffusion layer of the first conductivity type; and forming a metal layer for electrodes on the surface of said epitaxial
    Type: Grant
    Filed: December 8, 1980
    Date of Patent: March 22, 1983
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventor: Osamu Ozawa