Patents by Inventor Hitoshi Masumura
Hitoshi Masumura 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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Publication number: 20040242402Abstract: It is an object of the invention to provide a dielectric ceramic composition which enables its firing temperature to be lowered and which has an excellent electrical properties, particularly temperature dependence of resonance frequencies. A dielectric ceramic composition according to the invention comprises an oxide of a barium titanate family having a composition formula represented as BaTixO2x+1 (3.5≦x≦5.0); a first chemical element group consisting of at least one kind of alkaline-earth metals, silicon, zinc, aluminium, titanium, copper, bismuth and molybdenum; and a second chemical element group consisting of at least one kind of alkali metals and boron. A weight ratio of a total of each chemical element in the first and second chemical element groups to the oxide (the total of each chemical element/the oxide) is between 45/55 and 65/35 inclusive when the ratio is determined by converting said each chemical element to its oxide.Type: ApplicationFiled: February 17, 2004Publication date: December 2, 2004Inventors: Kazuhiro Ito, Hitoshi Masumura
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Publication number: 20020183190Abstract: The invention provides a dielectric ceramic composite that can be burnt at a low temperature. The dielectric ceramic composite in accordance with the invention is produced by means of adding eight kinds of chemical compounds of ZnO, SiO2, CuO, Al2O3, MgO, BaCO3, B2O3 to (BaNdSm)TiO3 and then wet-mixing them for three hours.Type: ApplicationFiled: January 24, 2002Publication date: December 5, 2002Inventors: Hitoshi Masumura, Masatoshi Kobayashi
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Patent number: 6174831Abstract: An object of the present invention is to provide a dielectric ceramic composition in which a volume changing ratio of the electrostatic capacity is within ±0.3% over a wide temperature range of −55 to +125° C., it satisfies the NPO characteristics regulated by EIA standard, the dielectric constant is high as 75 or more and the Q value of 2000 or higher and it is capable of subjecting to sintering at a low temperature of 1100 to 1150° C. The dielectric ceramic composition of the present invention is a (Ba Ca Sr Nd Gd)TiO3 series composition and to the composition was added and contained 1.0 to 5.0% by weight of ZnSiTiO5, 1.0 to 5.0% by weight of ZnSi2TiO7 or 1.0 to 5.0% by weight of CaSiTiO5 based on the weight of the composition.Type: GrantFiled: May 25, 1999Date of Patent: January 16, 2001Assignee: U.S. Philips CorporationInventors: Yukiko Furukawa, Hitoshi Masumura
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Patent number: 6087288Abstract: A dielectric ceramic composition including a compound of the BaTiO.sub.3 --Nb.sub.2 O.sub.5 --Co.sub.3 O.sub.4 group. The composition contains 1.1-1.4 mo. % of in total Nb.sub.2 O.sub.5 and Co.sub.3 O.sub.4 wherein the molar ration of Nb.sub.2 O.sub.5 to Co.sub.3 O.sub.4 is between 4.4 and 5.0. The composition contains 0.02-0.06% by weight of MnCO.sub.3, 0.02-0.25% by weight of Nd.sub.2 O.sub.3, 0.02-0.10% by weight of Y.sub.2 O.sub.3 and 0.05-0.15% by weight of Al.sub.2 O.sub.3 with respect to the weight of the composition. Laminated ceramic capacitors including the dielectric ceramic material show a capacity changing ration which is less than 15% in the temperature range between -55.degree. C. and +125.degree. C., a dielectric loss which is smaller than 3.5% and a dielectric constant which is 4000 or more.Type: GrantFiled: December 1, 1998Date of Patent: July 11, 2000Assignee: U.S. Philips CorporationInventors: Hitoshi Masumura, Kiyotaka Saito, Atsuko Fujii
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Patent number: 5140756Abstract: In conventional fluidized granulators whose housing is made of a steel plate, a powder tends to cause blocking if it is highly hygroscopic, and the bag filter used therein causes clogging. These problems have been solved in the present invention by forming the housing of a fluidized granulator with a porous membrane in place of the conventional steel plate. This fluidized granulator produces granules or a coated powder by spraying powder with water, a binder fluid or a coating fluid while maintaining the powder in a fluidized state.Type: GrantFiled: January 25, 1989Date of Patent: August 25, 1992Assignees: TDK Corporation, Ohkawara Kakohki Co., Ltd.Inventors: Shoichi Iwaya, Hitoshi Masumura, Hiroki Takahashi, Masaaki Ohkawara, Katsumi Kobayashi, Takashi Ito
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Patent number: 5091820Abstract: A ceramic piezoelectric, includes a thick core formed of a sintered ceramic material, and a pair of electrodes formed on opposing end faces of the core, wherein the electrodes are a reduced form of the ceramic material of the core. The electrodes may also be a reduced layer of an oxide formed on the ceramic material of the core.Type: GrantFiled: November 3, 1989Date of Patent: February 25, 1992Assignee: TDK CorporationInventors: Shouichi Iwaya, Munemitsu Hamada, Hitoshi Masumura
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Patent number: 5084426Abstract: A semiconductive ceramic composition capable of permitting its resistance-temperature characteristics and resistance to be controlled as desired and a firing temperature of the composition to be lowered to a degree sufficient to facilitate the mass-production at a low cost. The composition contains a main component consisting of SrO, PbO and TiO.sub.2 and is subjected to firing in an oxidizing atmosphere. The composition may contain at least one of SiO.sub.2 and M as a minor component. A variation in amount of the main and minor components permits characteristics and properties of the composition to be varied as desired.Type: GrantFiled: July 13, 1989Date of Patent: January 28, 1992Assignee: TDK CorporationInventors: Shoichi Iwaya, Hitoshi Masumura, Haruo Taguchi, Munemitsu Hamada, Tomohiro Sogabe, Shigeya Takahashi, Hiroyuki Satoh
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Patent number: 5015332Abstract: A spray drying chamber with a head section and a heat-resistant porous membrane, the porous membrane being detachable and the head section being displaceable vertically, whereby microdrops are sprayed into a spray drying chamber together with hot air, and whereby the microdrops are dried momentarily and a fine powder is produced.Type: GrantFiled: January 25, 1989Date of Patent: May 14, 1991Assignees: TDK Corporation, Ohkawara Kakohki Co., Ltd.Inventors: Shoichi Iwaya, Hitoshi Masumura, Hiroki Takahashi, Masaaki Ohkawara, Katsumi Kobayashi, Takashi Ito
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Patent number: 4987515Abstract: A ceramic capacitor, includes a thick core formed of a sintered ceramic material, and a pair of electrodes formed on opposing end faces of the core, wherein the electrodes are a reduced form of the ceramic material of the core. The electrodes may also be a reduced layer of an oxide formed on the ceramic material of the core.Type: GrantFiled: November 3, 1989Date of Patent: January 22, 1991Assignee: TDK CorporationInventors: Shouichi Iwaya, Munemitsu Hamada, Hitoshi Masumura
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Patent number: 4896436Abstract: The spray drying process and the apparatus therefor, of the present invention use a spray drying chamber formed by a heat-resistant porous membrane. Said porous membrane enables rapid separation of a discharge gas and a produced powder and accordingly total recovery of the produced powder from the spray drying chamber. Therefore, there occurs no nonuniformity in product composition; cleaning and blowing-off of adhered fine powder can be conducted rapidly and easily even in frequent product changes inevitable with a less grade larger quantity production system; as a result, a fine powder of higher quality and higher purity can be produced.Type: GrantFiled: April 18, 1988Date of Patent: January 30, 1990Assignees: TDK Corporation, Ohkawara Kakohki Co., Ltd.Inventors: Shoichi Iwaya, Hitoshi Masumura, Hiroki Takahashi, Masaaki Ohkawara, Katsumi Kobayashi, Takashi Ito
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Patent number: 4809442Abstract: The spray drying process and the apparatus therefor, of the present invention use a spray drying chamber formed by a heat-resistant porous membrane. Said porous membrane enables rapid separation of a discharge gas and a produced powder and accordingly total recovery of the produced powder from the spray drying chamber. Therefore, there occurs no nonuniformity in product composition; cleaning and blowing-off of adhered fine powder can be conducted rapidly and easily even in frequent product change inevitable with a less grade larger quantity production system; as a result, a fine powder of higher quality and higher purity can be produced.Type: GrantFiled: December 29, 1986Date of Patent: March 7, 1989Assignees: TDK Corporation, Ohkawara Kakohki Co.Inventors: Shoichi Iwaya, Hitoshi Masumura, Hiroki Takahashi, Masaaki Ohkawara, Katsumi Kobayashi, Takashi Ito
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Patent number: 4808883Abstract: A discharge lamp device includes a tube, and a cathode disposed in said tube and made of a valence-compensated semiconductor ceramic material, or a forcibly reduced semiconductor ceramic material, or a valence-compensated and forcibly reduced semiconductor ceramic material. Since the cathode does not include an electron-emitting material, but uses a semiconductor ceramic material, no vapor is produced by the cathode and also the cathode does not react with mercury vapor filled in the tube. Therefore, the discharge lamp device has improved characteristics such as greater heat resistance, better chemical resistance, and improved discharge characteristics. The discharge lamp device is less costly because the semiconductor ceramic material used as the cathode is inexpensive.Type: GrantFiled: March 22, 1988Date of Patent: February 28, 1989Assignee: TDK CorporationInventors: Shouichi Iwaya, Hitoshi Masumura, Munemitsu Hamada
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Patent number: 4484251Abstract: A current restriction device for alternate circuit with small size, low producing cost and low power loss has been found by using a ferro-electric body with rectangular hysterisis characteristics. Said device is used for instance as a ballast for restricting current in a fluorescent lamp. Said ferro-electric body has main component of B.sub.a T.sub.i O.sub.3, additive of S.sub.r or P.sub.b for substitution of part of B.sub.a and Z.sub.n or S.sub.n for substitution of part of T.sub.i, and a mineralizer of M.sub.n o or C.sub.r2 O.sub.3. The voltage-current characteristics of said ferro-electric body show non-linearity that the impedance ratio (Z.sub.2 /Z.sub.1) of the impedance Z.sub.2 measured with alternate field of 500 volts/mm to the impedance Z.sub.1 measured with alternate field of 5 volts/mm is less than 1/10.Type: GrantFiled: September 20, 1982Date of Patent: November 20, 1984Assignee: TDK Electronics Co., Ltd.Inventors: Sho Masujima, Yoshishige Towatari, Shoichi Iwaya, Hitoshi Masumura, Hisao Abe, Norimasa Sakamoto
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Patent number: 4404029Abstract: A D-E hysteresis loop of ferroelectrics known in the art has a square shape when the ferroelectrics are a BaTiO.sub.3 single crystal. Such ferroelectrics are used as a non-linear dielectric element of, for example a pulse generating device. The non-linear dielectric element according to the present invention consists of a polycrystal mainly composed of Ba(Ti.sub.0.90-0.98 Sn.sub.0.02-1.00)O.sub.3 and having an average grain diameter of from 10 to 60 .mu.m. The non-linearity is excellent and the temperature dependence of the non-linearity is considerably low.Type: GrantFiled: February 19, 1982Date of Patent: September 13, 1983Assignee: TDK Electronics Co., Ltd.Inventors: Shoichi Iwaya, Hitoshi Masumura, Yoshifumi Midori, Yasunobu Oikawa, Hisao Abe
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Patent number: 4073846Abstract: An improved reduction-reoxidation type semiconducting ceramic capacitor and the method for producing the same are disclosed. The main components of the substrate of the capacitor are CaTiO.sub.3, SrTiO.sub.3 and Bi.sub.2 O.sub.3 .multidot.xTiO.sub.2. Said substrate also contains at least one member selected from the group consisting of manganese, cobalt, nickel, chromium, vanadium, niobium, tantalum, lanthanum and cerium ions in total amounts of 0.025 to 0.4% by weight. The capacitor according to the present invention excels, in the temperature independency of the capacitance and tan .delta., etc.Type: GrantFiled: February 3, 1976Date of Patent: February 14, 1978Assignee: TDK Electronics Co., Ltd.Inventors: Hitoshi Masumura, Shinobu Fujiwara, Hitoshi Tanaka
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Patent number: 4014707Abstract: A dielectric ceramic composition comprises as principle constituents, 86 - 99.6 mole % of barium titanate, 0.2 - 10 mole % of niobium pentaoxide and 0.2 - 4 mole % of cerium oxide.Type: GrantFiled: July 8, 1975Date of Patent: March 29, 1977Assignee: TDK Electronics Company, LimitedInventors: Hitoshi Tanaka, Hitoshi Masumura, Shinobu Fujiwara
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Patent number: 3995300Abstract: An improved reduction-reoxidation type semiconducting ceramic capacitor and the method for producing the same are disclosed. The main components of the substrate of the capacitor are CaTiO.sub.3, SrTiO.sub.3 and Bi.sub.2 O.sub.3.xTiO.sub.2. Said substrate also contains at least one member selected from the group consisting of manganese, cobalt, nickel, chromium, vanadium, niobium, tantalum, lanthanum and cerium ions in total amounts of 0.025 to 0.4% by weight. The capacitor according to the present invention excels, in the temperature independency of the capacitance and tan .delta., etc.Type: GrantFiled: August 14, 1974Date of Patent: November 30, 1976Assignee: TDK Electronics Company, LimitedInventors: Hitoshi Masumura, Shinobu Fujiwara, Hitoshi Tanaka