Patents by Inventor Kousuke Nakamura
Kousuke Nakamura 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: 6275175Abstract: A device is disclosed for encoding a stream of databits of a binary source signal (S) into a stream of databits of a binary channel signal (C), wherein the bitstream of the source signal is divided into n-bit source words (x1, x2), which device comprises converting means (CM) adapted to convert said source words into corresponding m-bit channel words (y1, y2, y3). The converting means (CM) are further adapted to convert n-bit source words into corresponding m-bit channel words, such that the conversion for each n-bit source word is parity preserving (table I) (FIG. 1). The relations hold that m>n≧1, p≧1, and that p can vary. Preferably, m=n+1.Type: GrantFiled: October 27, 2000Date of Patent: August 14, 2001Assignee: U.S. Philips CorporationInventors: Josephus A. H. M. Kahlman, Toshiyuki Nakagawa, Yoshihide Shimpuku, Tatsuya Narahara, Kousuke Nakamura
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Patent number: 6225921Abstract: A device is disclosed for encoding a stream of databits of a binary source signal (S) into a stream of databits of a binary channel signal (C) satisfying a (d,k) constraint, wherein the bitstream of the source signal is divided into n-bit source words (x1, x2), which device comprises converting means (CM) adapted to convert said source words into corresponding m-bit channel words (Y1, Y2, Y2). The converting means (CM) are further adapted to convert n-bit source words into corresponding m-bit channel words, such that the conversion for each n-bit source word is parity preserving (table I). The relations hold that m>n≧1, p≧1, and that p can vary. Preferably, m=n+1.Type: GrantFiled: October 23, 1998Date of Patent: May 1, 2001Assignees: U.S. Philips Corporation, Sony CorporationInventors: Josephus A. H. M. Kahlman, Kornelis A. Schouhamer Immink, Gijsbert J. Van Den Enden, Toshiyuki Nakagawa, Yoshihide Shimpuku, Tatsuya Narahara, Kousuke Nakamura
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Patent number: 6175318Abstract: An encoder for encoding a stream of data bits of a binary source signal into a stream of data bits of a binary channel signal, the bitstream of the source signal being divided into smaller n-bit source words (x1, x2) which are converted by a logic circuit converter in the encoder into corresponding m-bit channel words, (y1, y2, y3). The conversion of each n-bit source word is parity preserving (see Table I and FIG. 1). The relations hold that m>n≧1, p≧1, and p can vary. Preferably, m=n+1. In order to comply with (d, k) runlength requirements, certain blocks of 2-bit source words are encoded into particular blocks of 3-bit channel words. A decoder is also disclosed for decoding a channel signal produced by the encoder.Type: GrantFiled: December 21, 1998Date of Patent: January 16, 2001Assignees: U.S. Philips Corporation, Sony CorporationInventors: Josephus A. H. M. Kahlman, Toshiyuki Nakagawa, Yoshihide Shimpuku, Tatsuya Narahara, Kousuke Nakamura
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Patent number: 5378417Abstract: Disclosed is a ceramic composite which comprises particles of at least one inorganic compound selected from the group consisting of a carbide, a nitride, an oxide, a boride, a silicide and an oxy-nitride and particles and whiskers of Si.sub.3 N.sub.4, Si.sub.2 N.sub.2 O or SiO.sub.2. This ceramic composite is small in volume change on sintering, and provides heat resistance. In addition, the composite can absorb thermal shock by its voids. It can be used in association with ceramic heaters, current collectors, commutators for starter motors and alternators, and in other areas.Type: GrantFiled: September 22, 1989Date of Patent: January 3, 1995Assignee: Hitachi, Ltd.Inventors: Yoshiyuki Yasutomi, Kousuke Nakamura, Hideki Kita, Masahisa Sobue
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Patent number: 5316987Abstract: Disclosed is a ceramic composite which comprises particles of at least one inorganic compound selected from the group consisting of a carbide, a nitride, an oxide, a boride, a silicide and an oxy-nitride and particles and whiskers of Si.sub.3 N.sub.4, Si.sub.2 N.sub.2 O or SiO.sub.2. This ceramic composite is small in volume change on sintering, and provides heat resistance. In addition, the composite can absorb thermal shock by its voids. It can be used in association with ceramic heaters, current collectors, commutators for starter motors and alternators, and in other areas.Type: GrantFiled: March 30, 1992Date of Patent: May 31, 1994Assignee: Hitachi, Ltd.Inventors: Yoshiyuki Yasutomi, Kousuke Nakamura, Hideki Kita, Masahisa Sobue
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Patent number: 5130055Abstract: Disclosed is a ceramic composite which comprises particles of at least one inorganic compound selected from the group consisting of a carbide, a nitride, an oxide, a boride, a silicide and an oxy-nitride and particles and whiskers of Si.sub.3 N.sub.4, Si.sub.2 N.sub.2 O or SiO.sub.2. This ceramic composite is small in volume change on sintering and superior in heat resistance and besides can absorb thermal shock by its voids. It can be used as ceramic heaters, current collectors, commutators for starter motor and alternator and the like.Type: GrantFiled: March 26, 1990Date of Patent: July 14, 1992Inventors: Yoshiyuki Yasutomi, Kousuke Nakamura, Hideki Kita, Masahisa Sobue
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Patent number: 4923829Abstract: Composite ceramic materials and a method of the same are disclosed, in which a ceramic material mainly containing silicon nitride, and at least one compound selected from a group consisting of nitrides, carbides, borides, silicides, oxides and oxynitrides of elements belonging to IIIa, IIIb, IVa, IBb, Va, VIa and VIII are combined to form a sintered body, and particles and whiskers of the ceramic material and compound are interlocked with each other and fixed so that the sintered body has a porosity of 5 to 30%. In the above composite ceramics, the particle of the compound are coupled with each other through the whisker or particle of the ceramic material. Accordingly, the composite ceramics are small in charge rate of size due to sintering, and are excellent in tenacity, heat resisting property and thermal shock resisting property. Further, the resistivity of the sintered body can be varied by changing the mixture ratio of ceramic material and compound.Type: GrantFiled: February 17, 1989Date of Patent: May 8, 1990Assignee: Hitachi, Ltd.Inventors: Yoshiyuki Yasutomi, Yasuo Matsushita, Kousuke Nakamura
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Patent number: 4690793Abstract: The nuclear fusion reactor of the present invention presents a new vacuum vessel for enclosing plasma particles where a reactor wall exposed to the above plasma particles has a piled structure. A plurality of heat-resisting ceramic tiles are metallurgically bonded to a metal-base body having a cooling means through a brazing material. The ceramic tiles are preferably composed of sintered silicon carbide of high density and containing a little beryllium oxide between the boundaries of crystal grains.Type: GrantFiled: February 17, 1984Date of Patent: September 1, 1987Assignee: Hitachi, Ltd.Inventors: Hisanori Okamura, Kunio Miyazaki, Hirosi Akiyama, Shinichi Itoh, Tomio Yasuda, Kousuke Nakamura, Yukio Okoshi, Mutuo Kamoshita, Akio Chiba
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Patent number: 4651192Abstract: A semiconductor device with a semiconductor element encased in a hollow ceramic package. The portion of the package at which the semiconductor element is disposed is formed from SiC admixed with Be or a compound of Be.Type: GrantFiled: July 3, 1985Date of Patent: March 17, 1987Assignee: Hitachi, Ltd.Inventors: Yasuo Matsushita, Kousuke Nakamura, Mitsuru Ura, Fumiyuki Kobayashi
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Patent number: 4585706Abstract: A semi-conductor device comprising sintered aluminum nitride having a high thermal conductivity, which comprises at least 65% by weight of aluminum nitride, and at least one of beryllium, a beryllium compound, lithium and a lithium compound.Type: GrantFiled: August 26, 1985Date of Patent: April 29, 1986Assignee: Hitachi, Ltd.Inventors: Yukio Takeda, Satoru Ogihara, Mitsuru Ura, Kousuke Nakamura, Tadamichi Asai, Tokio Ohkoshi, Yasuo Matsushita, Kunihiro Maeda
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Patent number: 4571610Abstract: Disclosed are semiconductor devices in which an electrical insulating substrate is made of a sintered silicon carbide body having thermal conductivity of at least 0.4 cal/cm.multidot.sec.multidot..degree.C. at 25.degree. C., electrical resistivity of at least 10.sup.7 ohm.multidot.cm at 25.degree. C. and coefficient of thermal expansion of 3.3.about.4.times.10.sup.-6 /.degree.C. at 25.degree. C. to 300.degree. C.Type: GrantFiled: December 16, 1982Date of Patent: February 18, 1986Assignee: Hitachi, Ltd.Inventors: Yasuo Matsushita, Yukio Takeda, Kousuke Nakamura, Tokio Ohkoshi
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Patent number: 4561010Abstract: A silicon carbide sintered body comprising silicon carbide as principal constituent, a first component for providing electrical insulating properties to said silicon carbide, said first component comprising at least one of metallic beryllium, beryllium compounds, boron and boron compounds and contained in a total amount of 0.01 to 3.5% by weight calculated as metal, and a second component which can further promote said silicon carbide sinterability provided by said first component and which does not diffuse easily in the particles of said silicon carbide, said second component comprising at least one substance selected from the Group I elements exclusive of hydrogen and francium, Group II elements exclusive of beryllium, radium and mercury, Group III elements exclusive of boron and aluminum, Group IV elements exclusive of carbon, Group V elements, Group VIa elements, Group VIIa elements Group VIII elements exclusive of iron, and compounds thereof, and contained in a total amount of 0.Type: GrantFiled: December 3, 1982Date of Patent: December 24, 1985Assignee: Hitachi, Ltd.Inventors: Satoru Ogihara, Yukio Takeda, Kunihiro Maeda, Kousuke Nakamura, Mitsuru Ura
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Patent number: 4555358Abstract: An electrically conductive sintered ceramics of the present invention comprises, as the main ingredients thereof, (a) silicon carbide, (b) an inorganic compound which exhibits a positive resistance-temperature coefficient, and preferably (c) a sintering assistant. The electrically conductive sintered ceramics obtained exhibits a positive resistance-temperature coefficient as a whole.A ceramic heater of the invention makes use of the electrically conductive sintered ceramics in an electrically conductive portion thereof.A sintered product which exhibits a positive resistance-temperature coefficient helps to prevent the occurrence of thermal runaway or thermal destruction.Type: GrantFiled: May 24, 1983Date of Patent: November 26, 1985Assignee: Hitachi, Ltd.Inventors: Yasuo Matsushita, Kousuke Nakamura, Koji Harada
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Patent number: 4540673Abstract: Sintered aluminum nitride having a high thermal conductivity, which comprises at least 65% by weight of aluminum nitride, and at least one of beryllium, a beryllium compound, lithium and a lithium compound, and a semi-conductor device using the same.Type: GrantFiled: April 29, 1982Date of Patent: September 10, 1985Assignee: Hitachi, Ltd.Inventors: Yukio Takeda, Satoru Ogihara, Mitsuru Ura, Kousuke Nakamura, Tadamichi Asai, Tokio Ohkoshi, Yasuo Matsushita, Kunihiro Maeda
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Patent number: 4528121Abstract: Electroconductive ceramic materials with high density, high mechanical strength, high endurance to repeated current supply and excellent thermal shock resistance can be obtained by mixing 5 to 70 parts by weight of Al.sub.2 O.sub.3 or alumina ceramic materials containing 95% by weight or more of Al.sub.2 O.sub.3 and 30 to 95 parts by weight of at least one electroconductive material selected from of ZrB.sub.2, ZrC, ZrN, ZrSi.sub.2, TaB.sub.2, TaC, TaN, TaSi.sub.2, TiB.sub.2, TiC, TiN, Mo.sub.2 B.sub.5 and MoSi.sub.2 adding a molding binder, molding the mixture and sintering the molded mixture. The electroconductive ceramic is usable for heaters, glow plug heaters, electrical gas ignitors, kerosine gasifying burners, and electrodes or conductors for water processing or dialysis.Type: GrantFiled: October 27, 1983Date of Patent: July 9, 1985Assignee: Hitachi, Ltd.Inventors: Yasuo Matsushita, Kousuke Nakamura, Tetuo Kosugi
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Patent number: 4517584Abstract: A semiconductor device with a semiconductor element encased in a hollow ceramic package. The portion of the package at which the semiconductor element is disposed is formed from a SiC-based substrate containing Be or a compound of Be with a thin SiO.sub.2 layer being capable of reacting with glass provided thereon and with a glass layer or a thin film circuit on the SiO.sub.2 layer.Type: GrantFiled: December 10, 1982Date of Patent: May 14, 1985Assignee: Hitachi, Ltd.Inventors: Yasuo Matsushita, Kousuke Nakamura, Mitsuru Ura
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Patent number: 4467309Abstract: A high-temperature thermistor comprising, a polycrystalline sintered body consisting essentially of 0.1-8 weight percents of at least one kind selected from the group consisting of Be, BeO, Be.sub.2 C, B, BN, B.sub.2 O.sub.3 and B.sub.4 C which weight percents are calculated as the amount of only Be or B single substance from net amount, the balance SiC, and the inevitable impurities having not more than 2 weight percents of SiO.sub.2, not more than 0.1 weight percent of Al, not more than 0.2 weight percents of Fe, not more than 1 weight percent of Si, and not more than 0.4 weights percents of free carbon, a pair of electrode provided on the surfaces of the sintered body, and lead wires each connected to the respective electrodes, and a method of producing same.Type: GrantFiled: April 26, 1982Date of Patent: August 21, 1984Assignee: Hitachi, Ltd.Inventors: Yasuo Matsushita, Kousuke Nakamura, Mitsuru Ura
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Patent number: 4370421Abstract: From 0.1 to 3.5% by weight of beryllium oxide powder, calculated as beryllium, is added to silicon carbide powder containing up to 0.1% by weight of aluminum, up to 0.1% by weight of boron and up to 0.4% by weight of free carbon, and the mixed powder is pressure-molded. The resulting molded article is heated to a temperature of 1,850.degree. C. to 2,500.degree. C. till there is obtained a sintered body having at least 90% relative density of silicon carbide. Thus, the sintered body having thermal conductivity of at least 0.4 cal/cm.sec..degree. C. at 25.degree. C., electrical resistivity of at least 10.sup.7 Ohm.cm at 25.degree. C. and coefficient of thermal expansion of 3.3.about.4.times.10.sup.-6 /.degree.C. at 25.degree. C. to 300.degree. C. can be obtained.Type: GrantFiled: November 5, 1980Date of Patent: January 25, 1983Assignee: Hitachi, Ltd.Inventors: Yasuo Matsushita, Yukio Takeda, Kousuke Nakamura, Tokio Okoshi
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Patent number: 4352120Abstract: In a semiconductor device, an active element is mounted on a supporter made of silicon carbide SiC. Since the thermal expansion coefficient of SiC is nearly equal to that of the semiconductor element, the integration of the element and the supporter will not give rise to thermal stresses in the element. Since silicon carbide has high degrees of thermal dissipation and conduction, the supporter of SiC can effectively dissipate heat generated in the semiconductor element. And since SiC has a high electrical conductivity and a high mechanical strength and is also light, it can be used as electrodes for the semiconductor element.Type: GrantFiled: April 22, 1980Date of Patent: September 28, 1982Assignee: Hitachi, Ltd.Inventors: Yasutoshi Kurihara, Hiroaki Hachino, Kousuke Nakamura
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Patent number: 4345179Abstract: A resistor spark plug having, between a terminal screw and a center electrode, electrical conductive glass seals and a resistor glass seal therebetween, said electrical conductive glass seals containing carbon, one or more metals and glass and said resistor glass seal containing carbon, silicon carbide, glass, boron carbide or titanium carbide, and if desired a filler, has a small voltage coefficient of resistance and stable properties and is effective for reducing noise from an ignition system.Type: GrantFiled: July 10, 1980Date of Patent: August 17, 1982Assignee: Hitachi, Ltd.Inventors: Tadamichi Asai, Kousuke Nakamura