Patents by Inventor Matsumi Watanabe
Matsumi Watanabe 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: 7781357Abstract: A dielectric ceramic composition comprising forsterite in an amount of 93.0 to 99.0 mol % when calculating in terms of 2MgO.SiO2 and calcium titanate in an amount of 1.0 to 7.0 mol % when calculating in terms of CaTiO3 as main components, and as a subcomponent, aluminum oxide in an amount of 0.2 to 5 mass % when calculating in terms of Al2O3 per 100 mass % of said main components. According to the present invention, a dielectric ceramic composition, capable of having both low permittivity and good frequency-temperature characteristic as well as ensuring high Qf value and further having sufficient mechanical strength, and suitable to use in an antenna, a filter and the like used in the high-frequency region, can be provided. Also, the present invention allows providing a dielectric ceramic composition further having resistance to reduction in addition to all of the above properties.Type: GrantFiled: September 25, 2008Date of Patent: August 24, 2010Assignee: TDK CorporationInventors: Masaru Abe, Kakeru Watanabe, Ryohei Nakano, Yasuo Niwa, Matsumi Watanabe
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Publication number: 20090088314Abstract: A dielectric ceramic composition comprising forsterite in an amount of 93.0 to 99.0 mol % when calculating in terms of 2MgO—SiO2 and calcium titanate in an amount of 1.0 to 7.0 mol % when calculating in terms of CaTiO3 as main components, and as a subcomponent, aluminum oxide in an amount of 0.2 to 5 mass % when calculating in terms of Al2O3 per 100 mass % of said main components. According to the present invention, a dielectric ceramic composition, capable of having both low permittivity and good frequency-temperature characteristic as well as ensuring high Qf value and further having sufficient mechanical strength, and suitable to use in an antenna, a filter and the like used in the high-frequency region, can be provided. Also, the present invention allows providing a dielectric ceramic composition further having resistance to reduction in addition to all of the above properties.Type: ApplicationFiled: September 25, 2008Publication date: April 2, 2009Applicant: TDK CORPORATIONInventors: Masaru Abe, Kakeru Watanabe, Ryohei Nakano, Yasuo Niwa, Matsumi Watanabe
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Patent number: 7399723Abstract: There is provided a dielectric ceramic material in which the firing temperature dependency of the relative dielectric constant can be suppressed and the mechanical strength can be improved. Specifically, there is provided a dielectric ceramic material including: main constituents given by a composition located in the region, in a ternary diagram of ZrO2, SnO2 and TiO2 shown in FIG. 1, bounded by point A, point B, point C, point D, point E and point F; and ZnO: 0.5 to 5 wt %, NiO: 0.1 to 3 wt %, and SiO2: 0.008 to 1.5 wt % in relation to the total weight of the main constituents. The dielectric ceramic material can include Nb2O5: 0.2 wt % or less and K2O: 0.035 wt % or less in relation to the total weight of the main constituents.Type: GrantFiled: October 4, 2006Date of Patent: July 15, 2008Assignee: TDK CorporationInventors: Isao Kanada, Ryohei Nakano, Tatsuya Kikuchi, Hisashi Kobuke, Masaru Abe, Kouji Tashiro, Matsumi Watanabe
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Publication number: 20080009404Abstract: There is provided a dielectric ceramic material in which the firing temperature dependency of the relative dielectric constant can be suppressed and the mechanical strength can be improved. Specifically, there is provided a dielectric ceramic material including: main constituents given by a composition located in the region, in a ternary diagram of ZrO2, SnO2 and TiO2 shown in FIG. 1, bounded by point A, point B, point C, point D, point E and point F; and ZnO: 0.5 to 5 wt %, NiO: 0.1 to 3 wt %, and SiO2: 0.008 to 1.5 wt % in relation to the total weight of the main constituents. The dielectric ceramic material can include Nb2O5: 0.2 wt % or less and K2O: 0.035 wt % or less in relation to the total weight of the main constituents.Type: ApplicationFiled: October 4, 2006Publication date: January 10, 2008Applicant: TDK CORPORATIONInventors: Isao Kanada, Ryohei Nakano, Tatsuya Kikuchi, Hisashi Kobuke, Masaru Abe, Kouji Tashiro, Matsumi Watanabe
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Patent number: 7312172Abstract: A dielectric ceramic composition, comprising a main component including at least a dielectric oxide having a composition expressed by [(CaxSr1-x)O]m[(TiyZr1-y-zHfz)O2], a first subcomponent including a Mn oxide and/or an Al oxide and a glass component, wherein “m”, “x”, “y” and “z” indicating composition mole ratios in the formula included in the main component are in relationships of 0.90?m?1.04, preferably 1.005?m?1.025, 0.5?x<1, preferably 0.6?x?0.9, 0.01?y?0.10, preferably 0.02?y?0.07 and 0<z?0.20, preferably 0<z?0.10.Type: GrantFiled: December 17, 2003Date of Patent: December 25, 2007Assignee: TDK CorporationInventors: Hiroshi Sasaki, Hitoshi Tanaka, Yasuo Niwa, Matsumi Watanabe, Tomoaki Nonaka
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Patent number: 7220691Abstract: A dielectric ceramic composition comprising 100 moles of barium titanate as the main component, and furthermore comprising with respect to 100 moles of the main component 0.1 to 3 moles of a first subcomponent including a magnesium oxide, 0.01 to 0.5 mole (note that 0.5 is not included) of a second subcomponent including a yttrium oxide, 0.01 to 0.2 mole of a third subcomponent including a vanadium oxide, and 0.5 to 10 moles of a glass component including a silicon oxide as the main component; wherein a manganese oxide and a chrome oxide are substantially not included, and an average particle diameter of dielectric particles is 0.35 ?m or smaller.Type: GrantFiled: September 27, 2006Date of Patent: May 22, 2007Assignee: TDK CorporationInventors: Tomoaki Nonaka, Hiroshi Sasaki, Tsutomu Odashima, Takahiro Harada, Matsumi Watanabe, Tetsuo Takaishi, Shinsuke Hashimoto
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Publication number: 20070078049Abstract: A dielectric ceramic composition comprising 100 moles of barium titanate as the main component, and furthermore comprising with respect to 100 moles of the main component 0.1 to 3 moles of a first subcomponent including a magnesium oxide, 0.01 to 0.5 mole (note that 0.5 is not included) of a second subcomponent including a yttrium oxide, 0.01 to 0.2 mole of a third subcomponent including a vanadium oxide, and 0.5 to 10 moles of a glass component including a silicon oxide as the main component; wherein a manganese oxide and a chrome oxide are substantially not included, and an average particle diameter of dielectric particles is 0.35 ?m or smaller.Type: ApplicationFiled: September 27, 2006Publication date: April 5, 2007Applicant: TDK CORPORATIONInventors: Tomoaki Nonaka, Hiroshi Sasaki, Tsutomu Odashima, Takahiro Harada, Matsumi Watanabe, Tetsuo Takaishi, Shinsuke Hashimoto
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Publication number: 20070045912Abstract: A production method of a dielectric ceramic composition having a main component containing a compound having a perovskite crystal structure of the general formula ABO3 (where, A is at least one type of element selected from Ba, Ca, Sr, and Mg, and B is at least one type of element selected from Ti, Zr, and Hf), having a step of synthesizing an ABO3 powder by a liquid phase method or solid phase method, a step of heat treating said synthesized ABO3 powder to remove gas ingredients contained in said ABO3 powder, and a step of firing a dielectric ceramic composition material including said ABO3 powder from which the gas ingredient has been removed.Type: ApplicationFiled: August 25, 2006Publication date: March 1, 2007Applicant: TDK CorporationInventors: Hiroshi Sasaki, Tsutomu Odashima, Tomoaki Nonaka, Matsumi Watanabe
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Publication number: 20060234853Abstract: A dielectric ceramic composition, comprising a main component including at least a dielectric oxide having a composition expressed by [(CaxSr1-x)O]m[(TiyZr1-y-zHfz)O2], a first subcomponent including a Mn oxide and/or an Al oxide and a glass component, wherein “m”, “x”, “y” and “z” indicating composition mole ratios in the formula included in the main component are in relationships of 0.90?m?1.04, preferably 1.005?m?1.025, 0.5?x<1, preferably 0.6?x?0.9, 0.01?y?0.10, preferably 0.02?y?0.07 and 0<z?0.20, preferably 0<z?0.10.Type: ApplicationFiled: December 17, 2003Publication date: October 19, 2006Inventors: Hiroshi Sasaki, Hitoshi Tanaka, Yasuo Niwa, Matsumi Watanabe, Tomoaki Nonaka
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Patent number: 6949486Abstract: A dielectric ceramic composition comprising a main component including 53.00 to 80.00 mol % magnesium oxide converted to MgO, 19.60 to 47.00 mol % titanium oxide converted to TiO2 and 0.05 to 0.85 mol % manganese oxide converted to MnO. This dielectric ceramic composition may comprises 0.00 to 0.20 mol % of at least any one of vanadium oxide, yttrium oxide, ytterbium oxide or holmium oxide converted to V2O5, Y2O3, Yb2O3 and Ho2O3 respectively.Type: GrantFiled: December 22, 2003Date of Patent: September 27, 2005Assignee: TDK CorporationInventors: Hiroshi Sasaki, Yasuo Niwa, Matsumi Watanabe
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Publication number: 20040132609Abstract: A dielectric ceramic composition comprising a main component including 53.00 to 80.00 mol % magnesium oxide converted to MgO, 19.60 to 47.00 mol % titanium oxide converted to TiO2 and 0.05 to 0.85 mol % manganese oxide converted to MnO. This dielectric ceramic composition may comprises 0.00 to 0.20 mol % of at least any one of vanadium oxide, yttrium oxide, ytterbium oxide or holmium oxide converted to V2O5, Y2O3, Yb2O3 and Ho2O3 respectively.Type: ApplicationFiled: December 22, 2003Publication date: July 8, 2004Applicant: TDK CORPORATIONInventors: Hiroshi Sasaki, Yasuo Niwa, Matsumi Watanabe