Patents by Inventor Kazuo Sunahara
Kazuo Sunahara 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: 20070251270Abstract: A method for producing a glass substrate for a magnetic disk by polishing a circular glass plate, which comprises a step of polishing the principal plane of the circular glass plate by using a slurry containing a CeO2 crystal powder, the CeO2 crystal powder being obtained in such a manner that a melt containing CeO2 is quenched to obtain an amorphous material, and the amorphous material is subjected to heat treatment to obtain a CeO2 crystals-precipitated amorphous material, which is subjected to acid treatment to separate and extract the CeO2 crystal powder from the CeO2 crystals-precipitated amorphous material.Type: ApplicationFiled: April 25, 2007Publication date: November 1, 2007Applicant: ASAHI GLASS COMPANY, LIMITEDInventors: Katsuaki Miyatani, Osamu Miyahara, Yuzuru Tanabe, Hiroshi Usui, Yoshihisa Beppu, Kazuo Sunahara, Mitsuru Horie, Satoshi Kashiwabara, Tomohiro Sakai, Yoshinori Kon, Iori Yoshida
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Patent number: 7270765Abstract: To provide a composition for forming a dielectric layer excellent in dielectric constant and withstand voltage properties, a MIM capacitor and a process for its production. A composition for forming a dielectric layer, which comprises fine particles of perovskite type dielectric crystal, glass frit, and a hydrolysable silicon compound or its oligomer, and a MIM capacitor comprising a substrate, and a bottom electrode layer, a dielectric layer having a structure such that fine particles of perovskite type dielectric crystal are dispersed in a silicon oxide matrix containing glass-forming ions and a top electrode, formed on the substrate in this order.Type: GrantFiled: June 13, 2005Date of Patent: September 18, 2007Assignee: Asahi Glass Company, LimitedInventors: Hiroyuki Tomonaga, Katsuaki Miyatani, Yoshihisa Beppu, Kumiko Takahashi, Kazuo Sunahara
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Publication number: 20070204519Abstract: To provide a process for producing CeO2 fine particles having high crystallinity, being excellent in uniformity of composition and particle size and having a small particle size, and a polishing slurry containing such fine particles. A process for producing CeO2 fine particles, which comprises a step of obtaining a melt containing, as represented by mol % based on oxides, from 5 to 50% of CeO2, from 10 to 50% of RO (wherein R is at least one member selected from the group consisting of Mg, Ca, Sr and Ba) and from 30 to 75% of B2O3, a step of quenching the melt to obtain an amorphous material, a step of precipitating CeO2 crystals from the amorphous material, and a step of separating the CeO2 crystals from the obtained crystallized product, in this order. A polishing slurry containing from 0.1 to 20 mass % of such fine particles.Type: ApplicationFiled: May 7, 2007Publication date: September 6, 2007Applicant: ASAHI GLASS CO., LTD.Inventors: Yoshihisa Beppu, Tomohiro Sakai, Satoshi Kashiwabara, Kazuo Sunahara
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Publication number: 20070178317Abstract: An infrared shielding film-coated glass plate comprising a glass substrate and an infrared shielding film formed thereon, wherein the infrared shielding film comprises fine ITO particles having an average primary particle diameter of at most 100 nm dispersed in a matrix containing silicon oxide and titanium oxide and has a film thickness of from 100 to 1,500 nm.Type: ApplicationFiled: January 26, 2007Publication date: August 2, 2007Applicant: Asahi Glass Company, LimitedInventors: Hirokazu KODAIRA, Hiroyuki Tomonaga, Kazuo Sunahara
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Publication number: 20070160922Abstract: To provide a process for producing a glass plate having an electric conductor pattern excellent in adhesion to the surface of the glass plate, whereby it is not required to have a screen ready for every model and adjustment to desired electric heating performance and antenna performance is easy, and a developer therefor. A developer for electronic printing, characterized in that the ratio of Ftc/Ftp is at least 2.5, where Ftc is the adhesive force acting between one toner particle containing conductive fine particles and one carrier, and Ftp is the adhesive force acting between one toner particle containing conductive fine particles and a photoconductor.Type: ApplicationFiled: January 5, 2007Publication date: July 12, 2007Applicants: Asahi Glass Company, Limited, MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Satoshi KASHIWABARA, Naoki Okahata, Kazuo Sunahara
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Publication number: 20070154829Abstract: To provide a process for producing a glass plate having an electric conductor pattern excellent in adhesion with the surface of the glass plate, whereby it is not required to have a screen ready for every model and adjustment to desired electric heating performance and antenna performance is easy, and a toner for electronic printing therefor. A toner for electronic printing, which comprises toner matrix particles comprising conductive fine particles, a heat decomposable binder resin and glass frit, and heat decomposable organic resin fine particles attached on the surface of the toner matrix particles, wherein the heat decomposition temperature of the organic resin in the heat decomposable organic resin fine particles is lower than the heat decomposition temperature of the heat decomposable binder resin.Type: ApplicationFiled: December 28, 2006Publication date: July 5, 2007Applicant: Asahi Glass Company, LimitedInventors: Satoshi Kashiwabara, Kazuo Sunahara, Naoki Okahata
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Publication number: 20070111097Abstract: A composite oxide suitable for an active material of a positive electrode for a lithium secondary cell which can be used in a wide range of voltage, has a large electric capacity and excellent low temperature performance and is excellent in the durability for charge-discharge cycles and highly safe, a process for its production, and a positive electrode and a cell employing it, are presented. The composite oxide is a lithium-cobalt composite oxide which is represented by the formula LiCo1-xMxO2, (wherein 0?x?0.02 and M is at least one member selected from the group consisting of Ta, Ti, Nb, Zr and Hf), and which has a half-width of the diffraction peak for (110) face at 2?=66.5±1°, of from 0.070 to 0.180°, as measured by the X-ray diffraction using CuK? as a ray source.Type: ApplicationFiled: January 10, 2007Publication date: May 17, 2007Applicant: Seimi Chemical Co., Ltd.Inventors: Manabu SUHARA, Kazuo Sunahara, Naoshi Saitoh, Tsutomu Katoh
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Publication number: 20070104887Abstract: A process for producing a glass plate with conductive printed wiring which does not require a new screen for each model and which can easily be adjusted for desired electric heating performance or antenna performance, and a conductive toner for such a process. A conductive toner comprising at least one member selected from the group consisting of a thermoplastic resin (A) having carboxyl groups introduced and having T100 of from 300 to 450° C., a polypropylene (B) having carboxyl groups introduced, and a thermoplastic resin (C) having T100 of from 300 to 450° C., conductive fine particles, and glass frit-containing particles. T100 is a temperature at the time when a weight change of the resin has become no longer observed during a temperature rise from room temperature at a rate of 10° C./min by means of a thermogravimetric analyzer (TG).Type: ApplicationFiled: November 30, 2006Publication date: May 10, 2007Applicant: ASAHI GLASS COMPANY, LIMITEDInventors: Satoshi Kashiwabara, Kazuo Sunahara, Naoki Okahata
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Patent number: 7208324Abstract: It is an object to provide a liquid composition for forming a thin film, with which a ferroelectric thin film having excellent characteristics can be prepared even by baking at a low temperature, and a process for producing a ferroelectric thin film using it. The above object is achieved by use of a liquid composition for forming a ferroelectric thin film, characterized in that in a liquid medium, ferroelectric oxide particles being plate or needle crystals, which are represented by the formula ABO3 (wherein A is at least one member selected from the group consisting of Ba2+, Sr2+, Ca2+, Pb2+, La3+, K+ and Na+, and B is at least one member selected from the group consisting of Ti4+, Zr4+, Nb5+, Ta5+ and Fe3+) and have a Perovskite structure and which have an average primary particle size of at most 100 nm and an aspect ratio of at least 2, are dispersed, and a soluble metal compound which forms a ferroelectric oxide by heating, is dissolved.Type: GrantFiled: October 28, 2005Date of Patent: April 24, 2007Assignee: Asahi Glass Company, LimitedInventors: Kazuo Sunahara, Hiroyuki Tomonaga, Yoshihisa Beppu
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Publication number: 20070077509Abstract: A color toner for electro printing, which comprises from 10 to 50 parts by mass of fine inorganic pigment particles, from 5 to 40 parts by mass of a heat decomposable binder resin having an acid value of at least 5, and from 40 to 85 parts by mass of glass frit, per 100 parts by mass of the total solid content of the toner.Type: ApplicationFiled: September 29, 2006Publication date: April 5, 2007Applicant: ASAHI GLASS COMPANY, LIMITEDInventors: Naoki Okahata, Satoshi Kashiwabara, Kazuo Sunahara
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Publication number: 20060124890Abstract: The present invention provides a liquid composition for forming a thin film, with which a ferroelectric thin film having excellent characteristics can be prepared even by baking at a low temperature, and a process for producing a ferroelectric thin film using it. A liquid composition for forming a ferroelectric thin film is used, which is characterized by comprising a liquid medium, crystalline ferroelectric oxide particles represented by the formula (Bi2O2)2+(Bim-1TimO3.5m-0.5)2? (wherein m is an integer of from 1 to 5) or (Bi2O2)2+(Am-1TimO3.5m-0.5)2? (wherein A is Bi3+ or La3+, the La3+/Bi3+ ratio is from 0.05 to 0.5, and m is an integer of from 1 to 5) and having an average primary particle diameter of at most 100 nm, dispersed in the liquid medium, and a soluble metal compound capable of forming a ferroelectric oxide by heating, dissolved in the liquid medium.Type: ApplicationFiled: January 27, 2006Publication date: June 15, 2006Applicant: ASAHI GLASS COMPANY, LIMITEDInventors: Kazuo Sunahara, Hiroyuki Tomonaga, Yoshihisa Beppu
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Publication number: 20060046320Abstract: It is an object to provide a liquid composition for forming a thin film, with which a ferroelectric thin film having excellent characteristics can be prepared even by baking at a low temperature, and a process for producing a ferroelectric thin film using it. The above object is achieved by use of a liquid composition for forming a ferroelectric thin film, characterized in that in a liquid medium, ferroelectric oxide particles being plate or needle crystals, which are represented by the formula ABO3 (wherein A is at least one member selected from the group consisting of Ba2+, Sr2+, Ca2+, Pb2+, La2+, K+ and Na+, and B is at least one member selected from the group consisting of Ti4+, Zr4+, Nb5+, Ta5+ and Fe3+) and have a Perovskite structure and which have an average primary particle size of at most 100 nm and an aspect ratio of at least 2, are dispersed, and a soluble metal compound which forms a ferroelectric oxide by heating, is dissolved.Type: ApplicationFiled: October 28, 2005Publication date: March 2, 2006Applicant: Asahi Glass Company, LimitedInventors: Kazuo Sunahara, Hiroyuki Tomonaga, Yoshihisa Beppu
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Publication number: 20060008928Abstract: It is an object to provide fine particles of bismuth titanate having excellent dielectric characteristics, high crystallinity and a small particle diameter, and a process for their production. The object is accomplished by a process which comprises a step of obtaining a melt comprising, as represented by mol % based on oxides, from 23 to 72% of Bi2O3, from 4 to 64% of TiO2 and from 6 to 50% of B2O3, a step of quickly quenching this melt to obtain an amorphous material, a step of crystallization of bismuth titanate crystals from the above amorphous material, and a step of separating the bismuth titanate crystals from the obtained crystallized material, in this order.Type: ApplicationFiled: September 13, 2005Publication date: January 12, 2006Applicant: ASAHI-GLASS COMPANY, LIMITEDInventors: Yoshihisa Beppu, Kazuo Sunahara, Hiroyuki Tomonaga, Kumiko Takahashi
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Publication number: 20060001069Abstract: To provide a composition for forming a dielectric layer excellent in dielectric constant and withstand voltage properties, a MIM capacitor and a process for its production. A composition for forming a dielectric layer, which comprises fine particles of perovskite type dielectric crystal, glass frit, and a hydrolysable silicon compound or its oligomer, and a MIM capacitor comprising a substrate, and a bottom electrode layer, a dielectric layer having a structure such that fine particles of perovskite type dielectric crystal are dispersed in a silicon oxide matrix containing glass-forming ions and a top electrode, formed on the substrate in this order.Type: ApplicationFiled: June 13, 2005Publication date: January 5, 2006Applicant: Asahi Glass Company, LimitedInventors: Hiroyuki Tomonaga, Katsuaki Miyatani, Yoshihisa Beppu, Kumiko Takahashi, Kazuo Sunahara
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Patent number: 6929883Abstract: The present invention provides a lithium-transition metal composite oxide having a large volume capacity density, high safety, excellent coating uniformity, excellent charge/discharge cycle durability and excellent low temperature characteristics, and suitable as a positive electrode active material for a lithium secondary cell. A lithium-transition metal composite oxide which is represented by the formula LixM1?yNyO2 (wherein 0.2?x?1.2, 0?y?0.7, M is a transition metal element, and N is a transition metal element other than M or an alkaline earth metal element), wherein in the distribution curve of the cumulative volume particle size of said lithium composite oxide, the inclination of the curve at a cumulative volume fraction of 20% and 80% are at most 9%/?m and at least 3%/?m, respectively, and the average particle size is from 3 to 20 ?m.Type: GrantFiled: May 30, 2001Date of Patent: August 16, 2005Assignee: Seimi Chemical Co., Ltd.Inventors: Manabu Suhara, Megumi Yukawa, Naoshi Saito, Takashi Kimura, Kazuo Sunahara
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Publication number: 20050164014Abstract: An infrared shielding glass coated with an infrared shielding film which is excellent in heat resistance and exhibits high visible light transmittance, low infrared transmittance (especially infrared transmittance in a near infrared region) and high electromagnetic wave transmittance. An infrared shielding glass comprising a glass substrate having at least one surface thereof coated with a coating liquid containing fine particles of conductive oxide and a matrix component to thereby provide an infrared shielding film, characterized in that the infrared shielding glass exhibits a transmittance at a wavelength of 1.0 ?m of at most 35% and a transmittance at a wavelength of 2.0 ?m of at most 20% and that the infrared shielding film has a surface resistivity of at least 1 M?/?.Type: ApplicationFiled: January 27, 2005Publication date: July 28, 2005Applicant: ASAHI GLASS COMPANY LIMITEDInventors: Hiroyuki Tomonaga, Takeshi Morimoto, Kazuo Sunahara
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Publication number: 20050084718Abstract: An infrared shielding film-coated glass comprising a glass substrate and an infrared shielding film formed thereon, wherein the infrared shielding film comprises a first film layer formed in a thickness of from 0.2 to 2 ?m on the surface of the glass substrate and having transparent electroconductive oxide fine particles having an average primary particle diameter of at most 100 nm dispersed in a silicon oxide matrix in a mass ratio of transparent electroconductive oxide fine particles/silicon oxide=10/0.5 to 10/20, and a second film layer laminated in a thickness of from 0.02 to 0.2 ?m on the first film layer and comprising silicon oxide, silicon oxynitride or silicon nitride, and the increase in haze by abrasion after a 1000 rotation test by a CS-10F abrasive wheel in accordance with the abrasion resistance test stipulated in JIS R3212 (1998) is at most 5%.Type: ApplicationFiled: October 13, 2004Publication date: April 21, 2005Applicant: ASAHI GLASS COMPANY, LIMITEDInventors: Hiroyuki Tomonaga, Kazuo Sunahara
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Publication number: 20040137325Abstract: A composite oxide suitable for an active material of a positive electrode for a lithium secondary cell which can be used in a wide range of voltage, has a large electric capacity and excellent low temperature performance and is excellent in the durability for charge-discharge cycles and highly safe, a process for its production, and a positive electrode and a cell employing it, are presented.Type: ApplicationFiled: December 23, 2003Publication date: July 15, 2004Applicant: Seimi Chemical Co., Ltd.Inventors: Manabu Suhara, Kazuo Sunahara, Naoshi Saitoh, Tsutomu Katoh
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Patent number: 6761997Abstract: A positive electrode active material for a nonaqueous electrolyte secondary battery includes at least a lithium-containing manganese layered composite oxide represented by the formula Li1-xAxMnO2, or the formula Li1-xAxMn1-yMyO2. The lithium-containing manganese composite oxide includes a lithium substitute metal A, such as Na, K, Ag, substituting for part of Li. The lithium substitution quantity x may be in the range of 0.03<x≦0.2.Type: GrantFiled: February 26, 2001Date of Patent: July 13, 2004Assignees: Nissan Motor Co., Ltd., Seimi Chemical Co., Ltd.Inventors: Fumio Munakata, Tatsuhiro Fukuzawa, Yasuhiko Ohsawa, Yuuji Tanjo, Takuya Mihara, Takashi Kimura, Kazuo Sunahara, Manabu Suhara
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Publication number: 20040023113Abstract: The present invention provides a lithium-transition metal composite oxide having a large volume capacity density, high safety, excellent coating uniformity, excellent charge/discharge cycle durability and excellent low temperature characteristics, and suitable as a positive electrode active material for a lithium secondary cell.Type: ApplicationFiled: November 29, 2002Publication date: February 5, 2004Inventors: Manabu Suhara, Megumi Yukawa, Naoshi Saito, Takashi Kimura, Kazuo Sunahara