Patents by Inventor Yasuji Yamada
Yasuji Yamada 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: 7160820Abstract: There is provided a process for preparing a composite material of an oxide crystal film and a substrate by forming a Y123 type oxide crystal film from a solution phase on a substrate using a liquid phase method, wherein problems such as cracking of the oxide crystal film, separation of the oxide crystal film from the substrate, and development of a reaction layer between the substrate and the solution can be minimized. The solvent for forming the solution phase uses either a BaO—CuO—BaF2 system or a BaO—CuO—Ag—BaF2 system, and when the substrate with a seed crystal film bonded to the surface is brought in contact with the solution to form (grow) the oxide crystal film on the substrate, the temperature of the solution is controlled to a temperature of no more than 850° C.Type: GrantFiled: May 15, 2002Date of Patent: January 9, 2007Assignees: International Superconductivity Technology Center, the Juridical Foundation, Fujikura Ltd.Inventors: Toshihiro Suga, Yasuji Yamada, Toshihiko Maeda, Seok Beom Kim, Haruhiko Kurosaki, Yutaka Yamada, Izumi Hirabayashi, Yasuhiro Iijima, Tomonori Watanabe, Hisashi Yoshino, Koji Muranaka
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Publication number: 20040214450Abstract: There is provided a process for preparing a composite material of an oxide crystal film and a substrate by forming a Y123 type oxide crystal film from a solution phase on a substrate using a liquid phase method, wherein problems such as cracking of the oxide crystal film, separation of the oxide crystal film from the substrate, and development of a reaction layer between the substrate and the solution can be minimized. The solvent for forming the solution phase uses either a BaO—CuO—BaF2 system or a BaO—CuO—Ag—BaF2 system, and when the substrate with a seed crystal film bonded to the surface is brought in contact with the solution to form (grow) the oxide crystal film on the substrate, the temperature of the solution is controlled to a temperature of no more than 850° C.Type: ApplicationFiled: June 7, 2004Publication date: October 28, 2004Inventors: Toshihiro Suga, Yasuji Yamada, Toshihiko Maeda, Seok Beom Kim, Haruhiko Kurosaki, Yutaka Yamada, Izumi Hirabayashi, Yasuhiro Iijima, Tomonori Watanabe, Hisashi Yoshino, Koji Muranaka
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Patent number: 5998050Abstract: A composite material is disclosed which includes a substrate, an oriented film provided on a surface of the substrate and formed of a crystal of a Y123 metal oxide of the formula LnBa.sub.2 Cu.sub.3 O.sub.y wherein Ln stands for Y or an element belonging to the lanthanoid and y is a number of 6-7, and a layer of a Y123 metal oxide of the formula LnBa.sub.2 Cu.sub.3 O.sub.y wherein Ln stands for Y or an element belonging to the lanthanoid and y is a number of 6-7 formed on the oriented film.Type: GrantFiled: December 19, 1996Date of Patent: December 7, 1999Assignees: International Superconductivity Technology Center, Hitachi Cable Ltd., Hokkaido Electric Power Co., Inc., Kyushu Electric Power Co., Inc., The Kansai Electric Power Co., Inc.,, Fujikura, Ltd.Inventors: Yasuji Yamada, Masaru Nakamura, Noriyuki Tatsumi, Jiro Tsujino, Kanshi Ohtsu, Yasuo Kanamori, Minoru Tagami, Atsushi Kume, Yuh Shiohara, Shoji Tanaka
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Patent number: 5974336Abstract: An oxide superconductor comprises a base material consisting of a single crystalline oxide, an oxide superconductor film consisting of a Y123 compound and formed on the single crystalline oxide base material, and a coating film consisting essentially of a Ba--Cu--O oxide and covering the surface of the oxide superconductor film, the coating film having a thermal expansion coefficient higher than that of the oxide superconductor film.Type: GrantFiled: October 15, 1997Date of Patent: October 26, 1999Assignees: Kabushiki Kaisha Toshiba, International Superconductivity Technology CenterInventors: Yasuji Yamada, Tamaki Masegi, Junichi Kawashima, Yusuke Niiori, Izumi Hirabayashi
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Patent number: 5962374Abstract: A process for preparing an oxide crystal by means of solution growth in the presence of a solvent is provided. The solvent includes a mixture of an oxide containing at least one member of those elements which constitute the oxide crystal, a halide containing at least one member of those elements which constitute the oxide crystal, and metallic silver.Type: GrantFiled: February 20, 1998Date of Patent: October 5, 1999Assignee: International Superconductivity Technology CenterInventors: Yuusuke Niiori, Yasuji Yamada, Junichi Kawashima, Izumi Hirabayashi
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Patent number: 5945395Abstract: The method for producing nonionic detergent granules includes the steps of (I) blending the following (i) to (iii): (i) at least one of a nonionic surfactant and an aqueous nonionic surfactant solution; (ii) an acid precursor of an anionic surfactant capable of having a lamellar orientation; (iii) at least one of an alkali builder and an alkali, porous oil-absorbing carrier, to give a mixture of detergent starting materials containing the nonionic surfactant as a main surfactant component; and (II) heating the mixture obtained in step (I) at least up to a temperature capable of neutralizing the acid precursor of the anionic surfactant in an agitating mixer, and granulating while tumbling the agitating mixer thereby increasing a bulk density, to give nonionic detergent granules having a bulk density of from 0.6 to 1.2 g/ml.Type: GrantFiled: September 29, 1997Date of Patent: August 31, 1999Assignee: KAO CorporationInventors: Hiroyuki Yamashita, Koji Toyoda, Masaaki Sakaue, Yasuji Yamada, Teruo Kubota, Hiroshi Kogurusu
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Patent number: 5872079Abstract: A superconductor comprising a compound of the formula (II):R.sub.1+x Ba.sub.2-x Cu.sub.3 O.sub.7-y1 (II)wherein not less than 40% of a crystal of the superconductor shows phase separation, and at (temperature, magnetic field) of (77?K!, O?T!) and (77?K!, 4?T!), a critical current density is not less than 10,000 A/cm.sup.2, which is obtained by heating a precursor which is a solid solution of the formula (I):R.sub.1+x Ba.sub.2-x Cu.sub.3 O.sub.7-y (I)wherein not more than 10% of a crystal of the solid solution shows phase separation, so that phase separation is formed in the crystals at a phase separation temperature, and introducing oxygen; and a superconductor comprising a compound of the formula (II):R.sub.1+x Ba.sub.2-x Cu.sub.3 O.sub.7-y1 (II)wherein not more than 10% of a crystal of the superconductor shows phase separation, and in a magnetic field of not less than 1?T! at a constant temperature of 77?K!, a critical current density is less than 10,000 A/cm.sup.Type: GrantFiled: December 6, 1996Date of Patent: February 16, 1999Assignees: Mitsubishi Cable Industries, Ltd.,, International Superconductivity Technology CenterInventors: Masaru Nakamura, Yasuji Yamada, Jian-Guo Wen, Yuh Shiohara, Shoji Tanaka
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Patent number: 5817172Abstract: For the solution growth, a solvent is used which is composed of a mixture of an oxide containing at least one member of those elements which constitute the oxide crystal and a halide containing at least one member of those elements which constitute the oxide crystal. The process enables the temperature of crystal growth to be lowered to a significant extent, avoids inclusions such as impure anionic elements from getting intruded into the oxide crystal, while retaining adequate crystal growth through solution growth, and affords, in spite of an atmospheric mode of crystal growth and with the pinning force of magnetic flux used to advantage, the same level of beneficial effects as in a mode of crystal growth at a low oxygen pressure.Type: GrantFiled: October 29, 1996Date of Patent: October 6, 1998Assignee: NGK Insulators, Ltd.Inventors: Yasuji Yamada, Yusuki Niiori, Yoshiaki Ito, Yutaka Yoshida, Izumi Hirabayashi
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Patent number: 5795856Abstract: The method for producing detergent particles having a high bulk density, the method being characterized by mixing granulated detergent particles having a bulk density of from 500 to 1,000 g/liter, while applying a shearing force to particles caused by a contact of the particles with each other in a mixer. According to the production method using a drum mixer of the present invention, it is possible to increase the bulk density of the detergent particles by 50 to 200 g/liter, wherein the granulated detergent particles or that of the granulated detergent particles subjected to a treatment of increasing bulk density by conventional methods have a bulk density of from 500 to 1,000 g/liter.Type: GrantFiled: September 27, 1996Date of Patent: August 18, 1998Assignee: Kao CorporationInventors: Koichi Hatano, Hiroyuki Yamashita, Masaaki Sakaue, Koji Toyoda, Yasuji Yamada
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Patent number: 5736501Abstract: The method for producing nonionic detergent granules includes the steps of (I) blending the following (i) to (iii): (i) at least one of a nonionic surfactant and an aqueous nonionic surfactant solution; (ii) an acid precursor of an anionic surfactant capable of having a lamellar orientation; (iii) at least one of an alkali builder and an alkali, porous oil-absorbing carrier, to give a mixture of detergent starting materials containing the nonionic surfactant as a main surfactant component; and (II) heating the mixture obtained in step (I) at least up to a temperature capable of neutralizing the acid precursor of the anionic surfactant in an agitating mixer, and granulating while tumbling the agitating mixer thereby increasing a bulk density, to give nonionic detergent granules having a bulk density of from 0.6 to 1.2 g/ml.Type: GrantFiled: July 24, 1995Date of Patent: April 7, 1998Assignee: Kao CorporationInventors: Hiroyuki Yamashita, Koji Toyoda, Masaaki Sakaue, Yasuji Yamada, Teruo Kubota, Hiroshi Kogurusu
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Patent number: 5712263Abstract: To provide novel steroid derivatives having an antitumor action which can be synthesized efficiently and stereoselectively by means of synthetic organic chemistry. A steroid derivative represented by the formula: ##STR1## wherein R is an alkyl group having 1 to 13 carbon atoms, A is a hydroxyl group or a group easily hydrolyzable to a hydroxyl group, X and Y together form an oxo group or an alkylenedioxy group having 2 or 3 carbon atoms, X is a hydroxyl group, an alkoxy group having 1 to 5 carbon atoms or a group easily hydrolyzable to a hydroxyl group, Y is a hydrogen atom or an alkoxy group having 1 to 5 carbon atoms, with the proviso that when X is a hydroxyl group or a group easily hydrolyzable to a hydroxyl group, Y is a hydrogen atom, and when X is an alkoxy group having 1 to 5 carbon atoms, Y is an alkoxy group having 1 to 5 carbon atoms, or a salt thereof.Type: GrantFiled: June 14, 1996Date of Patent: January 27, 1998Assignee: Taisho Pharmaceutical Co., Ltd.Inventors: Chihiro Yokoo, Hisaya Wada, Hidemichi Mitome, Tatsuhiko Sano, Katsuo Hatayama, Yasuji Yamada
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Patent number: 5632811Abstract: In order to stably retain an oxide-based melt consisting essentially of yttrium or a lanthanoid element, barium, copper and oxygen at a prescribed temperature with no impurity contamination thereby preparing a large oxide crystal of high quality from the melt, an oxide melt consisting essentially of yttrium or a lanthanoid element, barium, copper and oxygen is stored in a first crucible, which in turn is held in a second crucible. The first crucible is made of a material which is an oxide of at least one element forming the melt having a melting point higher by at least 10.degree. C. than a melt retention temperature and causing no structural phase transition up to a temperature higher by 10.degree. C. than the aforementioned prescribed temperature, with solubility of not more than 5 atomic percent with respect to the melt in a temperature range from the room temperature to a temperature higher by 10.degree. C. than the melt retention temperature.Type: GrantFiled: April 12, 1995Date of Patent: May 27, 1997Assignees: Sumitomo Electric Industries, Ltd., International Superconductivity Technology CenterInventors: Yasuo Namikawa, Yasuji Yamada, Satoshi Koyama, Yuh Shiohara, Shoji Tanaka
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Patent number: 5627142Abstract: A composite material is disclosed which includes a substrate, an oriented film provided on a surface of the substrate and formed of a crystal of a Y123 metal oxide of the formula LnBa.sub.2 Cu.sub.3 O.sub.y wherein Ln stands for Y or an element belonging to the lanthanoid and y is a number of 6-7, and a layer of a Y123 metal oxide of the formula LnBa.sub.2 Cu.sub.3 O.sub.y wherein Ln stands for Y or an element belonging to the lanthanoid and y is a number of 6-7 formed on the oriented film.Type: GrantFiled: July 25, 1994Date of Patent: May 6, 1997Assignees: International Superconductivity Technology Center, Hitachi Cable, Ltd., Hokkaido Electric Power Co., Inc., Kyushu Electric Power Co., Inc., Kansai Electric Power Co., Inc., Fujikura, Ltd.Inventors: Yasuji Yamada, Masaru Nakamura, Noriyuki Tatsumi, Jiro Tsujino, Kanshi Ohtsu, Yasuo Kanamori, Minoru Tagami, Atsushi Kume, Yuh Shiohara, Shoji Tanaka
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Patent number: 5602081Abstract: A method of preparing a crystal of a Y-series 123 metal oxide is disclosed, in which a substrate is immersed in a liquid phase which comprises components constituting the metal oxide. The liquid phase contains a solid phase located at a position different from the position at which the substrate contacts the liquid phase. The solid phase provides the liquid phase with solutes which constitute the Y-series 123 metal oxide so that the solutes are transported to the position at which the substrate and the liquid phase contact, thereby permitting the Y-series 123 metal oxide to grow on the substrate as primary crystals.Type: GrantFiled: May 9, 1994Date of Patent: February 11, 1997Assignees: International Superconductivity Technology Center, Mitsubishi Cable IndustriesInventors: Masaru Nakamura, Yasuji Yamada, Minoru Tagami, Yuh Shiohara, Shoji Tanaka
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Patent number: 5536704Abstract: A composite material comprising a bulky substrate of a Y-series 123 metal oxide crystal, and at least one layer provided on a surface of the substrate and formed of a crystal of a Y-series 123 metal oxide. The substrate may be produced by immersing a seed material in a liquid phase which comprises components constituting the metal oxide. The liquid phase contains a solid phase located at a position different from the position at which the seed material contacts the liquid phase. The solid phase provides the liquid phase with solutes which constitute the Y-series 123 metal oxide so that the solutes are transported to the position at which the seed material and the liquid phase contact, thereby permitting the Y-series 123 metal oxide to grow on the seed material as primary crystals and to obtain the bulky substrate. The layer of a Y-series 123 metal oxide may be formed on the substrate by a sputtering method, a vacuum deposition method, a laser abrasion method, a CVD method or a liquid phase epitaxy method.Type: GrantFiled: May 9, 1994Date of Patent: July 16, 1996Assignees: International Superconductivity Technology Center, Mitsubishi Cable Industries, Ltd., Kyocera Corporation, Japan Energy CorporationInventors: Yasuji Yamada, Minoru Tagami, Masaru Nakamura, Hideki Sakai, Koichi Uehara, Yuh Shiohara, Shoji Tanaka
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Patent number: 5512541Abstract: The present invention is directed to a method for growing a superconductive film on a superconductive substrate in order to produce a bulk single crystal. According to a preferred embodiment, an oxide superconductive film of a material which is the same or similar to the substrate material is epitaxially grown at a temperature between 450.degree. C. and 800.degree. C. so that the film and substrate have the same lattice orientations. According to the present invention, problems associated with conventional films having non-superconductor substrates (e.g., MgO and SrTiO.sub.3) are avoided.Type: GrantFiled: September 12, 1994Date of Patent: April 30, 1996Assignees: Sumitomo Electric Industries, Ltd., International Superconductivity Technology CenterInventors: Masaya Konishi, Kunihiko Hayashi, Youichi Enomoto, Shoji Tanaka, Yasuji Yamada, Kanshi Ohtsu, Yasuo Kanamori, Yuh Shiohara
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Patent number: 5407907Abstract: A method of pulling a crystal of a metal oxide is disclosed, in which the growth of the crystal is performed in a liquid phase having a composition which is different from the metal oxide and which contains components constituting the metal oxide. The liquid phase is in contact with a solid phase located at a position separated from the position at which the crystal of the metal oxide grows. The solid phase has a composition different from that of the metal oxide and supplies components constituting the metal oxide to the liquid phase.Type: GrantFiled: May 21, 1993Date of Patent: April 18, 1995Assignees: International Superconductivity Technology Center, Asahi Glass Co., Ltd., Ishikawajimaharima Jukogyo Kabushiki Kaisha, Sumitomo Metal Industries, Ltd., Kyushu Electric Power Co., Railway Technical Research InstituteInventors: Yasuji Yamada, Teruo Izumi, Kanshi Ohtsu, Yuichi Nakamura, Kengo Ishige, Yuh Shiohara, Minoru Tagami, Shoji Tanaka
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Patent number: 5122521Abstract: A novel sterol compound having an antitumor activity is disclosed. The compound is prepared by extracting sponges of the genus Xestospongia with an organic solvent and purifying the extract by conventional methods.Type: GrantFiled: July 12, 1991Date of Patent: June 16, 1992Assignee: Taisho Pharmaceutical Co., Ltd.Inventor: Yasuji Yamada
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Patent number: 4560703Abstract: Novel clavulone derivatives of the formula: ##STR1## wherein R.sup.1 and R.sup.2 combine together to form a keto group or either one of R.sup.1 and R.sup.2 is hydrogen atom and another one of them is hydroxy or acetoxy group, R.sup.3 and R.sup.4 are the same or different and are each hydrogen atom or acetoxy group, n is 0 or 1, provided that when the C--C bond between 8 and 12 positions is double bond, n is 0, a, b, c, d and e are each an integer of 1 or 2, and the dotted line means that the C--C bond is a single bond or double bond, or a salt thereof, which have excellent anti-inflammatory activity and anti-tumor activity and hence are useful as an anti-inflammatory agent or anti-tumor agent.Type: GrantFiled: September 23, 1983Date of Patent: December 24, 1985Assignee: Fujisawa Pharmaceutical Co., Ltd.Inventors: Masanori Fukushima, Osamu Hirai, Toshitaka Manda, Hiroyuki Kikuchi, Yasumasa Tsukitani, Iwao Shimizu, Yasuji Yamada
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Patent number: 4506085Abstract: A compound represented by the formula ##STR1## wherein R.sup.1 represents a lower alkyl group, a phenyl group or a benzyl group, or the two R.sup.1 groups together represent a group of the formula --CH.sub.2 --.sub.n in which n is an integer of 4 to 7; R.sup.2 represents a hydrogen atom, an alkyl group, or a substituted or unsubstituted aralkyl group; and Z represents a hydrogen atom, a lower alkyl group or a substituted or unsubstituted benzyl group;and a process for production thereof. The compounds of this invention are useful as intermediates for the synthesis of various biologically active substances, such as various antibiotics, particularly .beta.-lactam antibiotic derivatives, thienamycin, antibiotic PS-5 and their analogous substances.Type: GrantFiled: March 5, 1984Date of Patent: March 19, 1985Assignee: Sanraku-Ocean Co., Ltd.Inventor: Yasuji Yamada