Patents Assigned to Showa Denko Kabushiki Kaisha
  • Capacitor
    Patent number: 6452777
    Abstract: In a capacitor comprising a pair of electrodes and a dielectric substance intervening between the two electrodes, one of the electrodes is composed of sintered niobium nitride. Preferably, the dielectric substance is composed of niobium oxide and the electrode other than the electrode composed of sintered niobium nitride is composed of an ingredient selected from electrolytes, organic semiconductors and inorganic semiconductors. This capacitor has good environmental stability and good leak current characteristics.
    Type: Grant
    Filed: December 12, 2001
    Date of Patent: September 17, 2002
    Assignee: Showa Denko Kabushiki Kaisha
    Inventor: Kazumi Naito
  • Perfluorocyclicamine, constant boiling composition and process for producing the same
    Publication number: 20020125458
    Abstract: A process for producing a perfluorocyclicamine which includes electrolytically fluorinating a triallylamine in anhydrous liquid hydrogen fluoride. A constant boiling composition and process for producing the same is also described.
    Type: Application
    Filed: August 9, 2001
    Publication date: September 12, 2002
    Applicant: SHOWA DENKO KABUSHIKI KAISHA
    Inventors: Kiyomitsu Kanno, Toshio Nagashima, Galina I. Kaourova, Dmitri D. Moldavski, Vladimir I. Gribel
  • Process for producing cyanobenzoic acid derivatives
    Patent number: 6433211
    Abstract: A process for producing a cyanobenzoic acid compound, a cyanobenzamide compound, an alkyl cyanobenzoate compound, and a cyanobenzoyl chloride compound, which are useful intermediates for a variety of chemicals such as pharmaceuticals, agrochemicals, liquid crystals, and monomers for functional polymers. One nitrile group of an easily available phthalonitrile compound is selectively hydrolyzed to thereby produce a cyanobenzamide compound with high selectivity and yield. The cyanobenzamide compound thus-produced is transformed under acidic conditions into a cyanobenzoic acid compound and a cyanobenzoate ester compound without the cyano group of the benzene ring being damaged.
    Type: Grant
    Filed: September 24, 1999
    Date of Patent: August 13, 2002
    Assignee: Showa Denko Kabushiki Kaisha
    Inventors: Hiroshi Yasuda, Haruaki Ito, Takashi Tani, Kimitaka Ohshiro, Makoto Saito, Sumio Soya, Kuniomi Marumo
  • Separation method of goethite-containing red mud
    Publication number: 20020096476
    Abstract: In order to provide a method for effectively separating red mud generated during alumina-extraction treatment of an alumina ore containing goethite as an iron component, the alumina ore containing goethite as an iron component is treated with an alkaline solution at 110-160° C., to thereby take up alumina components through extraction, and a settling aid formed of a water-soluble polymer including, as an effective component, a copolymer containing, as a monomer component, a vinylhydroxamic acid compound or a salt thereof (A) and having an average molecular weight of at least 12,000,000 is added to the resultant extract, to thereby settle the red mud for separation thereof.
    Type: Application
    Filed: October 30, 2001
    Publication date: July 25, 2002
    Applicant: SHOWA DENKO KABUSHIKI KAISHA
    Inventors: Isao Ishikawa, Haruo Washikita, Yasuo Kawai, Koyuki Mesuda
  • L-ascorbic acid 2-phosphate zinc salt and process for manufacturing the same
    Patent number: 6420419
    Abstract: L-Ascorbic acid 2-phosphate zinc salt and a salt hydrate thereof having excellent solubility and exhibiting good stability even under weakly acidic conditions. Also disclosed is a process of manufacturing L-ascorbic acid 2-phosphate zinc salt by displacing a cation of a salt of an L-ascorbic acid 2-phosphate other than a zinc salt with a zinc cation. Further disclosed is a composition containing L-ascorbic acid 2-phosphate zinc salt or a salt hydrate thereof as an active ingredient.
    Type: Grant
    Filed: June 11, 1998
    Date of Patent: July 16, 2002
    Assignee: Showa Denko Kabushiki Kaisha
    Inventors: Masahiro Suzuki, Toshi Tsuzuki, Shinobu Ito, Eiji Ogata
  • Magnetic recording medium, production process thereof, magnetic recording and reproducing apparatus, and medium substrate
    Publication number: 20020076579
    Abstract: A magnetic recording medium which exhibits excellent magnetic characteristics and realizes high recording density comprises a non-magnetic substrate. A crystal-structure-regulating film, which regulates the crystal structure of a film provided directly thereon, is formed on the non-magnetic substrate A non-magnetic undercoat film and a magnetic film are formed on the crystal regulating film, and a soft magnetic film is provided between the non-magnetic substrate and the crystal-structure-regulating film. A process for producing the medium; a magnetic recording and reproducing apparatus including the medium; and a medium substrate used in the medium are also provided.
    Type: Application
    Filed: October 26, 2001
    Publication date: June 20, 2002
    Applicant: SHOWA DENKO KABUSHIKI KAISHA
    Inventors: Kenzo Hanawa, Hiroshi Ohsawa
  • Process for preparing ascorbic acid-2-monophosphate salt
    Patent number: 6388098
    Abstract: A process for preparing a high-purity ascorbic acid-2-monophosphate salt in a convenient manner and in a high yield, comprising hydrolyzing an ascorbic acid-2-polyphosphate or a salt thereof in the presence of magnesium ion at a pH of 7 or more.
    Type: Grant
    Filed: March 17, 2000
    Date of Patent: May 14, 2002
    Assignee: Showa Denko Kabushiki Kaisha
    Inventors: Kazuhiro Ohmori, Yuji Kobayashi, Tomokazu Soda
  • Epitaxial wafer for infrared light-emitting device and light-emitting device using the same
    Patent number: 6388274
    Abstract: The present invention provides an epitaxial wafer which is obtained by sequentially forming, on an n-type GaAs substrate, a first n-type GaAlAs layer; a second n-type GaAlAs layer; an n-type GaAlAs cladding layer; a p-type GaAlAs active layer which has an emission wavelength of 850-900 nm; and a p-type GaAlAs cladding layer, through liquid phase epitaxy, and, subsequently, removing the n-type GaAs substrate. In the epitaxial wafer, the p-type GaAlAs cladding layer has a thickness of 5-30 &mgr;m; the p-type GaAlAs cladding layer has an oxygen concentration of 3×1016 atoms/cm3 or less; the p-type GaAlAs cladding layer has a carrier concentration of 1×1017 cm−3 to 1×1018 cm−3; the p-type GaAlAs active layer has a thickness of 0.05-0.
    Type: Grant
    Filed: June 16, 2000
    Date of Patent: May 14, 2002
    Assignee: Showa Denko Kabushiki Kaisha
    Inventors: Atsushi Yoshinaga, Junichi Yamamoto, Akihiro Kitazaki
  • Photocatalytic titanium dioxide powder, process for producing same, and applications thereof
    Patent number: 6383980
    Abstract: A photocatalytic titanium dioxide powder comprised of finely divided titanium dioxide particles each having supported on the surface thereof a first supported layer of a calcium compound and further having on the surface of the first supported layer-formed particles a porous second supported layer of a photocatalytically inactive and substantially water-insoluble substance. The photocatalytic titanium dioxide powder is produced by allowing a calcium compound to be supported on the surface of finely divided titanium dioxide particles to form the first supported layer; and then, allowing a precursor material capable of forming the photocatalytically inactive and substantially water-insoluble substance to be supported on the surface of the first supported layer-formed particles, followed by converting the precursor a material to said water-insoluble substance to thereby form the porous second supported layer.
    Type: Grant
    Filed: September 8, 2000
    Date of Patent: May 7, 2002
    Assignee: Showa Denko Kabushiki Kaisha
    Inventors: Hiroyuki Hagihara, Katsura Ito
  • Method of producing &agr;-halo-&agr;,&bgr;-saturated carbonyl compounds from the corresponding &agr;,&bgr;-unsaturated compounds
    Patent number: 6379935
    Abstract: A method of producing an &agr;-halo-&agr;,&bgr;-saturated carbonyl compound from an &agr;-halocarbonyl compound having an &agr;, &bgr;-carbon-carbon double bond by reducing said &agr;,&bgr;-carbon-carbon double bond using a microorganism belonging to any one of the genera Acetobacter, Actinomyces, Acinetobacter, Agrobacterium, Aeromonas, Alcaligenes, Arthrobacter, Azotobacter, Bacillus, Brevibacterium, Burkholderia, Cellulomonas, Corynebacterium, Enterobacter, Enterococcus, Escherichia, Flavobacterium, Gluconobacter, Halobacteium, Halococccus, Klebsiella, Lactobacillus, Microbacterium, Micrococcus, Micropolyspora, Mycobacterium, Nocardia, Pseudomonas, Pseudonocardia, Rhodococcus, Rhodobacter, Serratia, Staphylococcus, Streptococcus and Streptomyces, Xanthomonas, or a microbial product thereof. Pseudomonas sp. SD810, SD811 and SD812, Burkholderia sp.
    Type: Grant
    Filed: August 5, 1999
    Date of Patent: April 30, 2002
    Assignee: Showa Denko Kabushiki Kaisha
    Inventors: Harumi Kamachi, Tadashi Yoneda, Motoaki Kamachi, Nobuyoshi Esaki
  • Solid electrolytic capacitor
    Patent number: 6381121
    Abstract: The present invention relates to a solid electrolytic capacitor comprising a solid electrolyte layer and an electrically conducting layer comprising metallic powder or an electrically conducting layer comprising an electrically conducting carbon layer and a layer formed thereon and comprising metallic powder in which at least one of said layers contains a rubber-like elastic material; a production process thereof; a solid electrolyte for use in the solid electrolytic capacitor; a production process of the solid electrolyte; an electrically conducting paste for use in the solid electrolytic capacitor; and an electrically carbon conducting paste for use in the solid electrolytic capacitor.
    Type: Grant
    Filed: May 24, 2000
    Date of Patent: April 30, 2002
    Assignee: Showa Denko Kabushiki Kaisha
    Inventors: Ryuji Monden, Katsuhiko Yamazaki, Atsushi Sakai, Yuji Furuta, Hideki Ohata, Koro Shirane, Hiroshi Konuma
  • Packing material and cartridge for solid phase extraction
    Publication number: 20020041938
    Abstract: A packing material for solid phase extraction, which is a particle having an exclusion limit molecular weight of 1×103 to 1.5×104 in gel permeation chromatography using a standard polystyrene as the sample. A column for solid phase extraction and a cartridge for solid phase extraction, a method of using the packing material; and a process for treating a sample using the column or cartridge are also disclosed.
    Type: Application
    Filed: August 21, 2001
    Publication date: April 11, 2002
    Applicant: SHOWA DENKO KABUSHIKI KAISHA
    Inventors: Ryuji Takahashi, Kuniko Igarashi, Hiroshi Suzuki
  • Porous co-polymer particles, process for preparing the same and use of the same
    Patent number: 6362245
    Abstract: A porous copolymer particle having a particle size of from 0.1 to 2,000 &mgr;m and a permanent pore size of from 2 to 800 nm comprising (i) a monomer containing from 5 to 60 wt % of a monomer (A) selected from N-vinylcarboxylic acid amides represented by formula (I): wherein R1 represents a hydrogen atom or a methyl group, and R2 represents a hydrogen atom, a C1-C8 alkyl group, a phenyl group or a phenyl group substituted with a methyl group or an ethyl group and (ii) from 40 to 95 wt % of a copolymerizable monomer (B) which contains a crosslinking monomer.
    Type: Grant
    Filed: October 4, 1999
    Date of Patent: March 26, 2002
    Assignee: Showa Denko Kabushiki Kaisha
    Inventors: Ryuji Takahashi, Hiroshi Suzuki, Kuniaki Shimbo
  • Epitaxial wafer for infrared light-emitting device and light-emitting device using the same
    Patent number: 6348703
    Abstract: The present invention provides an epitaxial wafer comprising, on a p-type GaAs single-crystal substrate, a first p-type layer; a p-type cladding layer; a p-type active layer; and an n-type cladding layer, wherein the n-type cladding layer has a carrier concentration of 1×1017 to 1×1018 cm−3; a sulfur concentration of 3×1016 atoms/cm3 or less; and a thickness of 20-50 &mgr;m. The maximum silicon concentration in the portion of the p-type cladding layer within 2 &mgr;m of the interface between the p-type cladding layer and the first p-type layer is less than 1×1018 atoms/cm3; the concentration of carbon, sulfur, or oxygen in the first p-type layer is less than 1×1017 atoms/cm3; the p-type cladding layer has a thickness of 50-80 &mgr;m; the first p-type layer has a carrier concentration of 3×1017 to 1×1018 cm−3; and the n-type cladding layer contains germanium at a concentration of 3×1018 cm−3 or less.
    Type: Grant
    Filed: April 27, 2000
    Date of Patent: February 19, 2002
    Assignee: Showa Denko Kabushiki Kaisha
    Inventors: Atsushi Yoshinaga, Junichi Yamamoto
  • Polymerizable composition and use thereof
    Publication number: 20020018938
    Abstract: The present invention provides a solid polymer electrolyte; a polymerizable composition having low viscosity and excellent processability for obtaining the solid polymer electrolyte; and a polymerizable compound having low viscosity, and good polymerizability and stability for use in the polymerizable composition. The present invention also provides primary and secondary batteries capable of working with high capacity and current; an electric double-layer capacitor ensuring high output voltage, large takeout current, and good processability; and an electrochromic device favored with high response speed. Each thereof use the solid polymer electrolyte of the present invention and are ensured with long life, excellent safety free of liquid leakage, high reliability and production at a low cost.
    Type: Application
    Filed: July 10, 2001
    Publication date: February 14, 2002
    Applicant: SHOWA DENKO KABUSHIKI KAISHA
    Inventors: Masataka Takeuchi, Shuichi Naijo, Ayako Nishioka
  • AlGaInP light-emitting diode
    Patent number: 6346719
    Abstract: An object of the present invention is to provide a high brightness n-side-up type AlGaInP light-emitting device with a simple structure. An n-type upper cladding layer is constructed by superimposing three n-type AlGaInP layers with different electron concentrations. The relationship between the electron concentrations of the three n-type AlGaInP layers is n3>n1>n2.
    Type: Grant
    Filed: June 23, 2000
    Date of Patent: February 12, 2002
    Assignee: Showa Denko Kabushiki Kaisha
    Inventors: Takashi Udagawa, Toshiki Yoshiuji, Ryouichi Takeuchi
  • Capacitor
    Patent number: 6347032
    Abstract: In a capacitor comprising a pair of electrodes and a dielectric substance intervening between the two electrodes, one of the electrodes is composed of sintered niobium nitride. Preferably, the dielectric substance is composed of niobium oxide and the electrode other than the electrode composed of sintered niobium nitride is composed of an ingredient selected from electrolytes, organic semiconductors and inorganic semiconductors. This capacitor has good environmental stability and good leak current characteristics.
    Type: Grant
    Filed: February 5, 2001
    Date of Patent: February 12, 2002
    Assignee: Showa Denko Kabushiki Kaisha
    Inventor: Kazumi Naito
  • Process for producing ascorbic acid-2-phosphoric ester salts
    Patent number: 6344567
    Abstract: A process for producing an ascorbic acid-2-phosphoric ester salt, where an ascorbic acid-2-phosphoric ester salt solution reduced in the content of excess phosphoric acid or a salt thereof mingled in the solution can be obtained from a solution containing an ascorbic acid-2-phosphoric ester or a salt thereof and a phosphoric acid or a salt thereof, with industrially high efficiency. A process for producing an alkaline earth metal salt of an ascorbic acid-2-phosphoric ester, comprising adding an alkaline earth metal compound to a stock solution containing an ascorbic acid-2-phosphoric ester or a salt thereof and a phosphoric acid or a salt thereof, at a liquid temperature of 0 to 30° C. to adjust the pH to 8.5 to 10.5.
    Type: Grant
    Filed: July 31, 2000
    Date of Patent: February 5, 2002
    Assignee: Showa Denko Kabushiki Kaisha
    Inventors: Yoshio Fujiwara, Yuji Kobayashi, Makoto Saito
  • Magnetic recording medium, production process thereof, and magnetic recording and reproducing apparatus
    Publication number: 20020009620
    Abstract: An object of the present invention is to provide a magnetic recording medium exhibiting excellent magnetic characteristics, such as coercive force. On a substrate, a Cr-containing non-magnetic undercoat film is formed, and a magnetic film of a B-containing Co alloy is formed on the undercoat film. In the vicinity of the interface between the non-magnetic undercoat film and the magnetic film, the amount of Cr is 40 at % or less in a region R1, in which the amount of B is 1 at % or more.
    Type: Application
    Filed: May 22, 2001
    Publication date: January 24, 2002
    Applicant: SHOWA DENKO KABUSHIKI KAISHA
    Inventors: Kenzo Hanawa, Toshinori Asaumi
  • Process for producing a magnetic recording medium
    Patent number: 6340505
    Abstract: A hydrogenated or fluorinated carbon protective film is formed on a disk through a plasma CVD method by use of a hydrocarbon-containing reaction gas as a raw material, where the disk comprises a non-magnetic substrate on which a non-magnetic undercoat film and a magnetic film are successively formed, wherein the protective film has a thickness of 2.2 g/cm3 or more.
    Type: Grant
    Filed: December 22, 1999
    Date of Patent: January 22, 2002
    Assignee: Showa Denko Kabushiki Kaisha
    Inventors: Mikio Suzuki, Noriyuki Miyamoto, Emi Shimaoka, Kimie Takagi