Patents by Inventor Tetsuo Takaishi
Tetsuo Takaishi 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).
-
Patent number: 9620777Abstract: A lithium ion secondary battery with a high electrode density and an excellent rate discharge characteristic. The positive electrode includes a positive electrode active material of a compound represented by Lia(NixCoyAl1-x-y)O2 (0.95?a?1.05, 0.5?x?0.9, 0.05?y?0.2), and carbon adhered to the surface of the material, in the Raman spectrum using a laser of 532 nm, the positive electrode includes a peak PA (D band) at 1200˜1450 cm?1, a peak PB (G band) at 1450˜1700 cm?1 and a peak PC at 400˜600 cm?1, and when the intensities are normalized by regarding the maximum intensity as 1 and the minimum intensity as 0 in the wavenumber domain of 200˜1800 cm?1, Raman intensity of the minimum (V band) between the two peaks of said peak PA and said peak PB is 0.6 or less, and Raman intensity of said peak PC is 0.1 or more and 0.5 or less.Type: GrantFiled: September 30, 2014Date of Patent: April 11, 2017Assignee: TDK CORPORATIONInventors: Hiroyuki Miyabara, Hiroki Kitamura, Yukiko Hirabayashi, Masaki Sobu, Tetsuo Takaishi
-
Patent number: 9083042Abstract: A negative electrode active material mainly contains silicon and silicon oxide. In the negative electrode active material, an Ar-laser Raman spectrum thereof includes a peak A corresponding to 950±30 cm?1 and a peak B corresponding to 480±30 cm?1, and an intensity ratio of the peak B to the peak A (B/A) is in the range of 1 to 10.Type: GrantFiled: March 18, 2013Date of Patent: July 14, 2015Assignee: TDK CORPORATIONInventors: Yasuhiro Ikeda, Atsushi Sano, Masaki Sobu, Tetsuo Takaishi
-
Publication number: 20150093633Abstract: A lithium ion secondary battery with a high electrode density and an excellent rate discharge characteristic. The positive electrode includes a positive electrode active material of a compound represented by Lia(NixCoyAl1?x?y)O2 (0.95:?a?1.05, 0.5?x?0.9, 0.05?y?0.2), and carbon adhered to the surface of the material, in the Raman spectrum using a laser of 532 nm, the positive electrode includes a peak PA (D band) at 1200˜1450 cm?1, a peak PB (G band) at 1450˜1700 cm?1 and a peak PC at 400˜600 cm?1, and when the intensities are normalized by regarding the maximum intensity as 1 and the minimum intensity as 0 in the wavenumber domain of 200˜1800 cm?1, Raman intensity of the minimum (V band) between the two peaks of said peak PA and said peak PB is 0.6 or less, and Raman intensity of said peak PC is 0.1 or more and 0.5 or less.Type: ApplicationFiled: September 30, 2014Publication date: April 2, 2015Inventors: Hiroyuki MIYABARA, Hiroki KITAMURA, Yukiko HIRABAYASHI, Masaki SOBU, Tetsuo TAKAISHI
-
Publication number: 20130256591Abstract: A negative electrode active material mainly contains silicon and silicon oxide. In the negative electrode active material, an Ar-laser Raman spectrum thereof includes a peak A corresponding to 950±30 cm?1 and a peak B corresponding to 480±30 cm?1, and an intensity ratio of the peak B to the peak A (B/A) is in the range of 1 to 10.Type: ApplicationFiled: March 18, 2013Publication date: October 3, 2013Applicant: TDK CORPORATIONInventors: Yasuhiro IKEDA, Atsushi SANO, Masaki SOBU, Tetsuo TAKAISHI
-
Patent number: 8232219Abstract: The present invention relates to a dielectric ceramic composition comprises a main component including a dielectric oxide having a composition shown by [(Ca1-xSrx)O]m[(Zr1-y-z-?TiyHf2Mn?)O2], note that, 0.991?m?1.010, 0?x?1, 0?y?0.1, 0<z?0.02, 0.002<??0.05), 0.1 to 0.5 parts by mol of Al2O3 and 0.5 to 5.0 parts by mol of SiO2 with respect to 100 parts by mol of the main component. A purpose of the present invention is to provide a dielectric ceramic composition available to prevent the occurrence of crack even when a dielectric layer is made thin, for example, 2 ?m or less, while maintaining various advantageous properties of a dielectric ceramic composition of [(CaSr)O]m[(TiZrHf)O2] type.Type: GrantFiled: March 20, 2009Date of Patent: July 31, 2012Assignee: TDK CorporationInventors: Tomoaki Nonaka, Tetsuo Takaishi, Kenta Iwasawa, Hiroshi Sasaki
-
Patent number: 7820578Abstract: The object of the present invention is to provide a method of production of dielectric ceramic composition which can lower the firing temperature without compensating the dielectric characteristics. The method of production according to the present invention is characterized by comprising steps of; preparing a dielectric oxide expressed by composition formula of [(CaxSr1-x)O]m[(TiyZr1-y-zHfz)O2] (x, y, z, and m in the formula are; 0.5?x?1.0, 0.01?y?0.10, 0<z?0.20 and 0.90?m?1.04 respectively), mixing, with respect to 100 parts by weight of the dielectric ceramic composition, 1 to 10 parts by weight of a sintering aid and 0.1 to 1.5 parts by weight of sodium oxide, sodium carbonate or a mixture thereof in terms of Na2O, and firing an obtained mixture; wherein said sintering aid comprises, with respect to 100 wt % of said sintering aid, 30 to 69 wt % of manganese compound in terms of MnO, 1 to 20 wt % of aluminum oxide in terms of Al2O3, and 30 to 50 wt % of silicon oxide in terms of SiO2.Type: GrantFiled: November 7, 2008Date of Patent: October 26, 2010Assignee: TDK CorporationInventors: Tetsuo Takaishi, Tomoaki Nonaka, Hiroshi Sasaki, Tsutomu Odashima, Kenta Iwasawa
-
Patent number: 7662250Abstract: A production method of a dielectric ceramic composition at least including a main component including a dielectric oxide having perovskite-type crystal structure expressed by a formula ABO3 (note that in the formula, “A” indicates one or more elements selected from Ba, Ca, Sr and Mg, and that “B” indicates one or more elements selected from Ti, Zr and Hf) comprises steps of preparing a main component material including said dielectric oxide expressed by ABO3; preparing a subcomponent material including a composite oxide expressed by M4R6O(SiO4)6 (note that “M” indicates at least one selected from Ca and Sr, and that “R” indicates at least one selected from Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu); mixing said main component material and subcomponent material to obtain a dielectric ceramic composition material; and firing said dielectric ceramic composition material.Type: GrantFiled: March 18, 2008Date of Patent: February 16, 2010Assignee: TDK CorporationInventors: Tomoaki Nonaka, Hiroshi Sasaki, Tsutomu Odashima, Tetsuo Takaishi, Takahiro Harada
-
Publication number: 20090246541Abstract: The present invention relates to a dielectric ceramic composition comprises a main component including a dielectric oxide having a composition shown by [(Ca1-xSrx)O]m[(Zr1-y-z-?TiyHf2Mn?)O2], note that, 0.991?m?1.010, 0?x?1, 0?y?0.1, 0<z?0.02, 0.002<??0.05), 0.1 to 0.5 parts by mol of Al2O3 and 0.5 to 5.0 parts by mol of SiO2 with respect to 100 parts by mol of the main component. A purpose of the present invention is to provide a dielectric ceramic composition available to prevent the occurrence of crack even when a dielectric layer is made thin, for example, 2 ?m or less, while maintaining various advantageous properties of a dielectric ceramic composition of [(CaSr)O]m[(TiZrHf)O2] type.Type: ApplicationFiled: March 20, 2009Publication date: October 1, 2009Applicant: TDK CORPORATIONInventors: Tomoaki Nonaka, Tetsuo Takaishi, Kenta Iwasawa, Hiroshi Sasaki
-
Publication number: 20090137381Abstract: The object of the present invention is to provide a method of production of dielectric ceramic composition which can lower the firing temperature without compensating the dielectric characteristics. The method of production according to the present invention is characterized by comprising steps of; preparing a dielectric oxide expressed by composition formula of [(CaxSr1-x)O]m[(TiyZr1-y-zHfz)O2] (x, y, z, and m in the formula are; 0.5?x?1.0, 0.01?y?0.10<z?0.20 and 0.90?m?1.04 respectively), mixing, with respect to 100 parts by weight of the dielectric ceramic composition, 1 to 10 parts by weight of a sintering aid and 0.1 to 1.5 parts by weight of sodium oxide, sodium carbonate or a mixture thereof in terms of Na2O, and firing an obtained mixture; wherein said sintering aid comprises, with respect to 100 wt % of said sintering aid, 30 to 69 wt % of manganese compound in terms of MnO, 1 to 20 wt % of aluminum oxide in terms of Al2O3, and 30 to 50 wt % of silicon oxide in terms of SiO2.Type: ApplicationFiled: November 7, 2008Publication date: May 28, 2009Applicant: TDK CORPORATIONInventors: Tetsuo Takaishi, Tomoaki Nonaka, Hiroshi Sasaki, Tsutomu Odashima, Kenta Iwasawa
-
Publication number: 20080236723Abstract: A production method of a dielectric ceramic composition at least including a main component including a dielectric oxide having perovskite-type crystal structure expressed by a formula ABO3 (note that in the formula, “A” indicates one or more elements selected from Ba, Ca, Sr and Mg, and that “B” indicates one or more elements selected from Ti, Zr and Hf) comprises steps of preparing a main component material including said dielectric oxide expressed by ABO3; preparing a subcomponent material including a composite oxide expressed by M4R6O(SiO4)6 (note that “M” indicates at least one selected from Ca and Sr, and that “R” indicates at least one selected from Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu); mixing said main component material and subcomponent material to obtain a dielectric ceramic composition material; and firing said dielectric ceramic composition material.Type: ApplicationFiled: March 18, 2008Publication date: October 2, 2008Applicant: TDK CORPORATIONInventors: Tomoaki Nonaka, Hiroshi Sasaki, Tsutomu Odashima, Tetsuo Takaishi, Takahiro Harada
-
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
-
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
-
Patent number: 4466812Abstract: A zeolite encapsulating material composed of an A-type zeolite expressed by a typical unit cell (CsxMII.sub.y Naz)(AlO.sub.2.SiO.sub.2).sub.12 .multidot.(NaAlO.sub.2).delta..multidot..omega.H.sub.2 O wherein MII represents a divalent metal; O.ltoreq..delta..ltoreq.1; and .omega. represents a positive number. Further, in the above stated unit cell, x, y and z which respectively represent the numbers of Cs, M and Na within the unit cell are in a relation:x+2y+z=123.ltoreq.x<100<y.ltoreq.4.5.Type: GrantFiled: August 2, 1982Date of Patent: August 21, 1984Assignee: Toyo Soda Manufacturing Co., Ltd.Inventors: Tetsuo Takaishi, Keiji Itabashi, Satoru Morishita, Hisashi Hatotani
-
Patent number: 3982912Abstract: A novel type of zeolite is obtained by replacing ion-exchangeable active cations in A-type zeolite with potassium ions and divalent cations at 33.3 to 83.3% and 16.7 to 66.7%, respectively to combine into the total of 100%. This zeolite is effective for separation of a mixture consisting of non-polar molecules and polar molecules having the adsorption effective cross-section less than 5 A. For instance, monosilane and phosphine, both of which are adsorbed by the conventional Ca--A type zeolite, can be separated by the novel K--A type zeolite which adsorbs phosphine.Type: GrantFiled: May 6, 1974Date of Patent: September 28, 1976Inventors: Yoshifumi Yatsurugi, Tatsuo Kuratomi, Tetsuo Takaishi