Patents by Inventor Kenji Yoshino
Kenji Yoshino 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).
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Patent number: 5507967Abstract: An electrorheological magnetic fluid including an electrically insulating liquid and fine particles dispersed therein is described, wherein the fine particles include a fine magnetic particle as a core, wherein the fine magnetic particle has a surface which is covered by an electroconductive substance, and the fine magnetic particle with its surface covered by the electroconductive substance is completely coated with a surfactant. A process for producing the electrorheological magnetic fluid is also described.Type: GrantFiled: November 16, 1994Date of Patent: April 16, 1996Assignees: Toyohisa Fujita, Nittetsu Mining Co., Ltd., Hitachi Powdered Metals Co., Ltd.Inventors: Toyohisa Fujita, Kenji Yoshino
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Patent number: 5490015Abstract: An actuator apparatus for driving a focus adjusting lens of a focus adjusting mechanism of an endoscope comprises a moving member put in slidable frictional engagement with a base of the endoscope, the moving member having coupling means for coupling with the movable portion within the endoscope, a piezoelectric element coupled to the moving member, the piezoelectric element and the moving member alone constituting a body of the actuator apparatus, and actuator control circuit for causing quick deformation in the piezoelectric element, enabling the piezoelectric element to apply an impulse force to the moving member, thereby moving the moving member against a frictional engagement force acting between the base and the moving member.Type: GrantFiled: January 19, 1994Date of Patent: February 6, 1996Assignee: Olympus Optical Co., Ltd.Inventors: Koichi Umeyama, Tatsuya Yamaguchi, Yasuhiro Ueda, Sakae Takehana, Hiroki Moriyama, Kazuhiro Yoshida, Yutaka Fujisawa, Ichiro Takahashi, Masami Hamada, Keiichi Arai, Yutaka Tatsuno, Kenji Yoshino, Tomoki Funakubo
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Patent number: 5427103Abstract: There is provided an apparatus for receiving nuclear magnetic resonance signals by applying high frequency energy to a living body placed in a static magnetic field. The distal end portion of the insertion section of the endoscope has a rigid distal end portion and a bendable portion. A housing portion for housing a high frequency coil is provided between the rigid distance portion and the bendable portion. This structure makes it possible to assemble the high frequency coil into the endoscope in a compact manner and can reduce a patient's burden when the insertion section is inserted in the body cavity of the patient.Type: GrantFiled: June 25, 1993Date of Patent: June 27, 1995Assignee: Olympus Optical Co., Ltd.Inventors: Koji Fujio, Masakazu Gotanda, Tatsuya Yamaguchi, Shuichi Takayama, Takashi Tsukaya, Koichi Matsui, Hiroki Hibino, Keiichi Hiyama, Koichi Shimizu, Kenji Yoshino, Masaaki Hayashi
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Patent number: 5423848Abstract: A trocar comprises an obturator having a piercing tip, and a cannula for forming a passage in tissue that is punched by the piercing tip. The cannula is formed from a flexible tube or a coil tube and transforms and libitum in accordance with the shape of the surgical tool that is to be inserted into the body cavity through the cannula. Therefore, the trocar of the invention allows insertion of a surgical tool curved in a circular arc into the body cavity without requiring no enlargement of the inside diameter of the cannula.Type: GrantFiled: June 6, 1994Date of Patent: June 13, 1995Assignee: Olympus Optical Co., Ltd.Inventors: Nobuhiko Washizuka, Yasuhiko Oomagari, Tsuruo Hatori, Tsuyoshi Tsukagoshi, Minoru Tsuruta, Seiji Kuramoto, Shuichi Kimura, Akio Nakada, Shiro Bito, Shinichi Nishigaki, Kenji Yoshino, Keisuke Saito, Yasuo Goto
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Patent number: 5402788Abstract: A diagnostic system using a nuclear magnetic resonance phenomenon comprises an external magnetic field generator, provided externally, for generating a magnetic field in a living body, a thin diameter member capable of being inserted into a body cavity and having flexibility, a high frequency coil, provided at a top end of the thin diameter member, for transmitting and receiving a high frequency, a nuclear magnetic resonance signal measuring device for receiving a nuclear magnetic resonance signal from the living body, and a transformer, provided between the high frequency coil and the nuclear magnetic resonance signal measuring device, for electrically isolating and separating the high frequency coil from the nuclear magnetic resonance signal measuring device in a manner such that the nuclear magnetic resonance signal is transmittable between the high frequency coil and the nuclear magnetic resonance signal measuring device.Type: GrantFiled: June 21, 1993Date of Patent: April 4, 1995Assignee: Olympus Optical Co., Ltd.Inventors: Koji Fujio, Masakazu Gotanda, Tatsuya Yamaguchi, Shuichi Takayama, Takashi Tsukaya, Toshihiko Hagiwara, Koichi Matsui, Hiroki Hibino, Keiichi Hiyama, Koichi Shimizu, Kenji Yoshino, Masaaki Hayashi
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Patent number: 5391144Abstract: An ultrasonic treatment apparatus comprises at least one hand piece, a plurality of probes, and an ultrasonic drive device. The hand piece has an ultrasonic oscillation device for generating ultrasonic vibration. Each probe is adapted to be attached to the hand piece and designed to transmit the ultrasonic vibration generated by the hand piece. The ultrasonic drive device is connected to the hand piece, for driving the ultrasonic oscillation device.Type: GrantFiled: July 20, 1993Date of Patent: February 21, 1995Assignee: Olympus Optical Co., Ltd.Inventors: Tomohisa Sakurai, Hideo Nagazumi, Kazuya Hijii, Toshihiko Suzuta, Masahiro Kudo, Kenji Yoshino, Tetsumaru Kubota, Tatsuya Kubota, Hiroaki Kagawa, Yuichi Ikeda, Mitsumasa Okada, Hitoshi Karasawa, Tadao Hagino
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Patent number: 5380179Abstract: The improved binder system for use in the injection molding of sinterable powders such as metal powders, ceramic powders and cermet powders comprises a (co)polymer that has a molecular weight in excess of 2000 and which contains at least one epoxy group in the molecule. Preferably, the binder system comprises said (co)polymer, a (co)polymer other than said (co)polymer, and an organic compound having a molecular weight up to 2000. Using a binder system comprising (a) 3-80 wt % of a (co)polymer that has a molecular weight in excess of 2000 and which has at least one epoxy group in the molecule, (b) up to 70 wt % of a (co)polymer other than component (a), and (c) 20-80 wt % of an organic compound having a molecular weight of not more than 2000, there is provided a composition for the injection molding of sinterable powders. The compound has excellent moldability and strength properties.Type: GrantFiled: March 16, 1993Date of Patent: January 10, 1995Assignee: Kawasaki Steel CorporationInventors: Kimihiro Nishimura, Kenji Yoshino
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Patent number: 5242981Abstract: The improved resin composition comprises:(A) a melt-workable liquid-crystal polyester resin obtained by polymerizing components selected from the group consisting of a dicarboxylic acid represented by the general formula (a) HOOC--R.sub.1 --COOH, a diol represented by the general formula (b) HO--R.sup.2 --OH, and an oxycarboxylic acid represented by the general formula (c) HO--R.sup.3 --COOH;(B) a polycarbonate resin having a recurring unit represented by the general formula: ##STR1## (C) a polyolefin and/or an olefinic copolymer, and the polyolefin and/or olefinic copolymer (C) is contained in an amount of 1-15 parts by weight per 100 parts by weight of a resin consisting of 95-5 wt % of the liquid-crystal polyester resin (A) and 5-95 wt % of the polycarbonate resin(B). This resin composition is balanced between various physical properties including moldability, heat resistance, impact resistance, dimensional stability and stiffness.Type: GrantFiled: September 3, 1991Date of Patent: September 7, 1993Assignee: Kawasaki Steel CorporationInventors: Mitsuhiko Izumi, Kenji Yoshino, Tadahiro Wakui
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Patent number: 5218069Abstract: The novel imidated copolymer of indene or the polymerizable component of naphtha oil and maleimide and, if necessary, maleic anhydride is useful as a resin improver and a compatibilizing agent for the purpose of improving heat resistance and mechanical properties.Another novel imidated copolymer prepared by applying copolymerization of other polymerizable component to the polymerization process is useful as a resin improver and a compatibilizing agent in which, in addition to the above characteristic properties, melting temperature can be designed to a given level.Type: GrantFiled: November 7, 1991Date of Patent: June 8, 1993Assignee: Kawasaki Steel CorporationInventors: Norihide Enomoto, Kenji Yoshino, Yoshihiro Naruse, Seiji Yamamoto
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Patent number: 5211625Abstract: An ultrasonic treatment apparatus comprises a hand piece, and an RF power supply unit. The hand piece includes vibrator cover, a sheath connected thereto, a hollow cylindrical member, an ultrasonic vibrator in the cover for generating ultrasonic vibrations, a probe arranged in the sheath, for externally transmitting ultrasonic vibrations generated by the vibrator, and a cord for transmitting a high-frequency current from the RF power supply unit to the probe. The cover and sheath are composed of an insulating member, for preventing the high-frequency current transmitted by the probe from being externally leaked.Type: GrantFiled: March 15, 1991Date of Patent: May 18, 1993Assignee: Olympus Optical Co., Ltd.Inventors: Tomohisa Sakurai, Tetsumaru Kubota, Tatsuya Kubota, Hiroaki Kagawa, Yuichi Ikeda, Mitsumasa Okada, Hitoshi Karasawa, Hideo Nagazumi, Kazuya Hijii, Toshihiko Suzuta, Masahiro Kudo, Kenji Yoshino, Tadao Hagino
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Patent number: 5163433Abstract: An ultrasound type treatment apparatus includes an inner sheath covering an ultrasonic transmission member having a first suction passage and defining a space relative to the ultrasound transmission member and an outer sheath covering the inner sheath and defining a space relative to the inner sheath. In the treatment apparatus, a liquid medium supply passage is provided at one of the space between the ultrasound transmission member and the inner sheath and space between the inner sheet and the outer sheet to supply a liquid medium to the distal end of the ultrasound transmission member. A second suction passage is formed at the other of the space between the ultrasound transmission means and the inner sheath and space between the inner sheath and the outer sheath. The first suction passage is connected by a suction tube to the second suction passage.Type: GrantFiled: October 21, 1991Date of Patent: November 17, 1992Assignee: Olympus Optical Co., Ltd.Inventors: Hiroaki Kagawa, Tomohisa Sakurai, Tetsumaru Kubota, Hitoshi Karasawa, Tatsuya Kubota, Yuichi Ikeda, Mitsumasa Okada, Toshihiko Suzuta, Hideo Nagazumi, Kazuya Hijii, Masahiro Kudo, Kenji Yoshino, Tadao Hagino
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Patent number: 5130383Abstract: Thermoplastic resin compositions comprising polyarylate and polyamide resins as main components, and an epoxy resin of the following formula [1] in a predetermined amount are provided. ##STR1## The thermoplastic resin compositions of the invention have good impact strength along with good heat and solvent resistances and good moldability.Type: GrantFiled: January 9, 1991Date of Patent: July 14, 1992Assignee: Kawasaki Steel CorporationInventors: Kenji Yoshino, Kazuya Takemura, Tadahiro Wakui
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Patent number: 5122904Abstract: The operating microscope comprises at least one suction port formed in a microscope body or an arm for supporting the microscope body which is to be enveloped in a drape, and an exhaust fan or exhaust pump connected to the suction port. An exhaust port to be connected to an exhaust pump may be formed in the drape. Since air is exhausted out of the drape, and the drape is brought into close contact with the microscope body and the arm by operating the exhaust fan or the exhaust pump, the drape does not constitute a hindrance in the visual field of a surgeon or dgrade operability of the microscope.Type: GrantFiled: October 22, 1990Date of Patent: June 16, 1992Assignee: Olympus Optical Co., Ltd.Inventors: Hiroshi Fujiwara, Masami Hamada, Shigeo Tokunaga, Masahiko Kinukawa, Tomonori Ishikawa, Takashi Fukaya, Masanori Kaneda, Kenji Yoshino, Tadao Hagino
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Patent number: 5076276Abstract: An ultrasound type treatment apparatus includes an ultrasonic oscillation device for outputting an ultrasonic oscillation wave, a drive circuit for driving the ultrasonic oscillation device, a probe connected to the ultrasonic oscillation device to transmit that ultrasonic oscillation wave to an affected region of interest of a human being, a sheath formed around the probe, through which cooling medium is passed and a supply tank for supplying cooling medium to the sheath. In this treatment apparatus, an arithmetic operation circuit monitors a drive state of the ultrasonic oscillation device, a comparator is provided for receiving monitor information from the arithmetic operation circuit and for determining whether or not the supply of cooling medium to the sheath is normal and a controller is provided for stopping a drive of the ultrasonic oscillation device when the supply of the cooling medium is determined by the comparator as being not normal.Type: GrantFiled: August 24, 1990Date of Patent: December 31, 1991Assignee: Olympus Optical Co., Ltd.Inventors: Tomohisa Sakurai, Tetsumaru Kubota, Hitoshi Karasawa, Tatsuya Kubota, Yuichi Ikeda, Mitsumasa Okada, Toshihiko Suzuta, Hideo Nagazumi, Kazuya Hijii, Masahiro Kudo, Hiroaki Kagawa, Kenji Yoshino, Tadao Hagino
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Patent number: 5049295Abstract: Provided herein are an aromatic polyester having superior physical properties which is composed of the following units ##STR1## an aromatic polyester amide formed by introducing a prescribed amount of amide linkage into said aromatic polyester; filament thereof; and a composition formed by adding an inorganic filler or magnetic powder to said polymers.Type: GrantFiled: December 27, 1989Date of Patent: September 17, 1991Assignee: Kawasaki Steel CorporationInventors: Kazuya Takemura, Tadahiro Wakui, Kenji Yoshino
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Patent number: 5037900Abstract: Thermoplastic resin compositions comprising polyarylate and polyamide resins as main components, polyethylene terephthalate and an epoxy resin of the following formula [1] in a predetermined amount are provided. ##STR1##The thermoplastic resin compositions of the invention have good impact strength along with good heat and solvent resistances and good moldability.Type: GrantFiled: December 12, 1989Date of Patent: August 6, 1991Assignee: Kawasaki Steel CorporationInventors: Kenji Yoshino, Kazuya Takemura, Tadahiro Wakui
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Patent number: 5019725Abstract: Input circuit having an input terminal for accepting an input signal varying between "high" and "low" voltage magnitudes, wherein the input circuit is provided with a compensated threshold voltage located between the "high" and "low" voltage magnitudes for properly characterizing the status of the input signal depending upon whether the input signal has a voltage above or below the threshold voltage. The input circuit has a load circuit disposed between a power supply side and an input stage of the input circuit. The load circuit includes a logic element and operates to temporarily increase the threshold voltage associated with the input stage in response to noise generated at the ground side of the input circuit, thereby preventing the noise level from surpassing the threshold voltage as temporarily increased.Type: GrantFiled: October 3, 1989Date of Patent: May 28, 1991Assignee: Texas Instruments IncorporatedInventor: Kenji Yoshino
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Patent number: 5013818Abstract: An improved polyarylate resin is provided, which resin comprises the following units (I) to (IV) ##STR1## the units (I) being contained in an amount of from 3 to 30 mole %, the units (II) being contained in amount of not less than 30 mole %, the units (III) being contained in an amount of not less than 30 mole %, and the units (IV) being contained in an amount of not larger than 25 mole %, each based on the total moles of the units (I) to (IV). The polyarylate resin has good mechanical strength, heat resistance, resistance to color change, transparency, moldability and flame retardancy. A resin composition comprising the polyarylate resin, a polyamide and an epoxy resin is also provided.Type: GrantFiled: December 12, 1989Date of Patent: May 7, 1991Assignee: Kawasaki Steel CorporationInventors: Kazuya Takemura, Kenji Yoshino, Tadahiro Wakui
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Patent number: 4916720Abstract: An X-ray analyzer for performing both X-ray fluorescence and X-ray diffraction analysis is provided with an X-ray source, an X-ray guide tube for collimating X-rays from the source, a vacuum tank in which the guide tube is partially disposed, a rotatable sample table for holding a sample adjacent the guide tube, and an X-ray detector movable away from and towards the sample table, and also rotatable independently of the sample table.Type: GrantFiled: November 15, 1988Date of Patent: April 10, 1990Assignees: Horiba, Ltd., Hitachi, Ltd.Inventors: Naoki Yamamoto, Yukio Takano, Yoshinori Hosokawa, Kenji Yoshino
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Patent number: RE35014Abstract: Thermoplastic resin compositions comprising polyarylate and polyamide resins as main components, polyethylene terephthalate and an epoxy resin of the following formula [1] in a predetermined amount are provided. ##STR1##The thermoplastic resin compositions of the invention have good impact strength along with good heat and solvent resistances and good moldability.Type: GrantFiled: August 6, 1993Date of Patent: August 8, 1995Assignee: Kawasaki Steel CorporationInventors: Kenji Yoshino, Kazuya Takemura, Tadahiro Wakui