Magnesium Aluminosilicate (e.g., Cordierite, Etc.) Patents (Class 501/9)
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Patent number: 6642161Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.Type: GrantFiled: April 2, 2001Date of Patent: November 4, 2003Assignee: Minolta Co., Ltd.Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
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Patent number: 6642162Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.Type: GrantFiled: April 2, 2001Date of Patent: November 4, 2003Assignee: Minolta Co., Ltd.Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
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Patent number: 6627565Abstract: Crystallized glasses for data recording media such as magnetic disks are provided, comprising 42-65 mol % SiO2, 11-25 mol % Al2O3, 15-33 mol % MgO and 5.5-13 mol % TiO2 or 58-80 mol % SiO2+Al2O3 with MgO/(SiO2+Al2O3) being in the range of 0.125-0.55, wherein major crystals or crystals present at 50% by volume or more comprise &agr;-quartz solid solution or quartz-based crystals and enstatite and/or enstatite solid solution, or quartz-based crystals having a diffraction pattern almost comparable to that unique to quartz in the X-ray diffraction pattern and enstatite and/or enstatite solid solution and wherein the specific gravity is 2.9 g/cm3 or more. Said glass substrates have high Young's modulus, strength and heat resistance and excellent surface smoothness and surface homogeneity, and can be easily prepared.Type: GrantFiled: July 26, 2000Date of Patent: September 30, 2003Assignee: Hoya CorporationInventors: Xuelu Zou, Katsuaki Uchida
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Patent number: 6627567Abstract: A glass ceramics composition for recording disk substrate contains, essentially, expressed in terms of weight percent on the oxide basis, from 35 to 60 wt % of SiO2, from 10 to 30 wt % of Al2O3, from 10 to 30 wt % of MgO and from 0.1 to 1.8 wt % of P2O5.Type: GrantFiled: July 13, 2000Date of Patent: September 30, 2003Assignee: Minolta Co., Ltd.Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
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Patent number: 6624101Abstract: A glass ceramics composition for recording disk substrate contains, essentially, expressed in terms of weight percent on the oxide basis, from 51 to 57.5 wt % of SiO2, from 10 to 30 wt % of Al2O3, from 10 to 30 wt % of MgO, and from 0.1 to 6.8 wt % of TiO2.Type: GrantFiled: July 13, 2000Date of Patent: September 23, 2003Assignee: Minolta Co., Ltd.Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
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Publication number: 20030171201Abstract: Enclosed are crystallized glasses suitable for a substrate for an information recording medium such as a magnetic disc, optical disc, or optomagnetic disc, a substrate for information recording medium using such a crystallized glass substrate, and an information recording medium using such a substrate for information recording medium. The crystallized glasses are capable of providing a glass substrate having a high Young's modulus, as well as excellent mechanical strength, surface flatness, and heat resistance and having an excellent surface smoothness upon polishing. Glass substrate having an excellent surface smoothness using such a crystallized glass are also disclosed.Type: ApplicationFiled: February 25, 2003Publication date: September 11, 2003Inventors: Xuelu Zou, Kouji Azegami
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Patent number: 6610620Abstract: A glass ceramics composition for recording disk substrate contains, essentially, expressed in terms of weight percent on the oxide basis, from 48 to 54.8 wt % of SiO2, from 10 to 30 wt % of Al2O3, from 10 to 30 wt % of MgO, and from 2.4 to 10 wt % of Li2O.Type: GrantFiled: July 13, 2000Date of Patent: August 26, 2003Assignee: Minolta Co., Ltd.Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
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Patent number: 6605554Abstract: The present invention refers to glass-ceramics consisting of the mixtures (I): ZrO2—SiO2—MeIIO, or (II) SiO2—MeIIIO2—MeIIO, wherein: MeII is chosen in the group consisting of: Ca, Ba, Mg, Zn or mixture thereof; MeIII is chosen in the group consisting of Al, B or mixtures thereof; each of the above said constituents being present in determined quantities; the invention refers also to a process for preparing the glass-ceramics above defined; porcelain stonewares and glazes containing them and their use for preparing ceramic items.Type: GrantFiled: February 7, 2000Date of Patent: August 12, 2003Assignee: Colorobbia Italia S.p.A.Inventors: Marco Bitossi, Giovanni Baldi, Davide Settembre Blundo, Enrico Generali
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Patent number: 6596659Abstract: A glass ceramics composition for recording disk substrate contains, essentially, expressed in terms of weight percent on the oxide basis, from 35 to 50 wt % of SiO2, from 10 to 30 wt % of Al2O3, from 10 to 30 wt % of MgO, and from 2.6 to 8 wt % of Li2O.Type: GrantFiled: July 13, 2000Date of Patent: July 22, 2003Assignee: Minolta Co., Ltd.Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
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Patent number: 6593259Abstract: A glass ceramics composition for recording disk substrate contains, essentially, expressed in terms of weight percent on the oxide basis, from 54.5 to 59.5 wt % of SiO2, from 10 to 30 wt % of Al2O3, from 10 to 30 wt % of MgO, and from 3 to 12 wt % of Li2O.Type: GrantFiled: July 13, 2000Date of Patent: July 15, 2003Assignee: Minolta Co., Ltd.Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
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Patent number: 6583077Abstract: A glass ceramics composition for recording disk substrate contains, essentially, expressed in terms of weight percent on the oxide basis, from 50.5 to 56 wt % of SiO2, from 10 to 30 wt % of Al2O3, from 10 to 30 wt % of MgO, and from 4.2 to 10.6 wt % of TiO2.Type: GrantFiled: July 13, 2000Date of Patent: June 24, 2003Assignee: Minolta Co., Ltd.Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
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Patent number: 6583078Abstract: A glass ceramics composition for recording disk substrate contains, essentially, expressed in terms of weight percent on the oxide basis, from 47.5 to 58 wt % of SiO2, from 10 to 30 wt % of Al2O3, from 10 to 30 wt % of MgO, and from 0.1 to 2.8 wt % of ZrO2.Type: GrantFiled: July 13, 2000Date of Patent: June 24, 2003Assignee: Minolta Co., Ltd.Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
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Patent number: 6573206Abstract: A glass ceramics composition for recording disk substrate contains, essentially, expressed in terms of weight percent on the oxide basis, from 47.5 to 52.5 wt % of SiO2, from 10 to 30 wt % of Al2O3, from 10 to 30 wt % of MgO, and from 6.2 to 7.8 wt % of TiO2.Type: GrantFiled: July 13, 2000Date of Patent: June 3, 2003Assignee: Minolta Co., Ltd.Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
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Publication number: 20030100434Abstract: A low-thermal-expansion, rigid and wear-resistant ceramic is provided.Type: ApplicationFiled: October 8, 2002Publication date: May 29, 2003Inventors: Yasuki Yoshitomi, Tadahisa Arahori
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Patent number: 6569792Abstract: Enclosed are crystallized glasses suitable for a substrate for an information recording medium such as a magnetic disc, optical disc, or optomagnetic disc, a substrate for information recording medium using such a crystallized glass substrate, and an information recording medium using such a substrate for information recording medium. The crystallized glasses are capable of providing a glass substrate having a high Young's modulus, as well as excellent mechanical strength, surface flatness, and heat resistance and having an excellent surface smoothness upon polishing. Glass substrate having an excellent surface smoothness using such a crystallized glass are also disclosed.Type: GrantFiled: July 26, 2001Date of Patent: May 27, 2003Assignee: Hoya CorporationInventors: Xuelu Zou, Kouji Azegami
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Patent number: 6569791Abstract: A glass ceramics composition for recording disk substrate contains, essentially, expressed in terms of weight percent on the oxide basis, from 52 to 56 wt % of SiO2, from 10 to 30 wt % of Al2O3, from 10 to 30 wt % of MgO, and from 7 to 12 wt % of TiO2.Type: GrantFiled: July 13, 2000Date of Patent: May 27, 2003Assignee: Minolta Co., Ltd.Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
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Patent number: 6569790Abstract: A glass ceramics composition for recording disk substrate contains, essentially, expressed in terms of weight percent on the oxide basis, from 54 to 60 wt % of SiO2, from 10 to 30 wt % of Al2O3, from 10 to 30 wt % of MgO, and from 0.1 to 2.7 wt % of Li2O.Type: GrantFiled: July 13, 2000Date of Patent: May 27, 2003Assignee: Minolta Co., Ltd.Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
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Patent number: 6541407Abstract: A ceramic comprising predominately a cordierite-type phase approximating the stoichiometry Mg2Al4Si5O18 and having a coefficient of thermal expansion (25-800° C.) of greater than 4×10−7/° C. and less than 13×10−7/° C. and a permeability and a pore size distribution which satisfy the relation 2.108 (permeability)+18.511 (total pore volume)+0.1863 (percentage of total pore volume comprised of pores between 4 and 40 micrometers)>24.6. The ceramic is suitable in the fabrication of cellular, wall-flow, diesel particulate filters having a pressure drop in kPa that at an artificial carbon soot loading of 5 grams/liter and a flow rate of 26 scfm is less than 8.9−0.035 (number of cells per square inch)+300 (cell wall thickness in inches), a bulk filter density of at least 0.60 g/cm3 and a volumetric heat capacity of at least 0.67 J cm−3 K−1 as measured at 500° C.Type: GrantFiled: May 29, 2001Date of Patent: April 1, 2003Assignee: Corning IncorporatedInventors: Douglas M. Beall, David L. Hickman, Gregory A. Merkel
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Patent number: 6495480Abstract: A glass-ceramic substrate for an information storage medium made of a glass-ceramics having a crystal phase dispersed in a glass matrix has a ratio of crystal phase (the amount of crystal) in the glass-ceramics is within a range from 50 wt % to 70 wt % and crystal grains having an average crystal grain diameter within a range from 0.10 &mgr;m to 0.50 &mgr;m are exposed on the surface of the substrate. The glass-ceramics substrate has Young's modulus within a range from 95 GPa to 160 GPa, specific gravity within a range from 2.40 to 2.80, and a ratio of Young's modulus to specific gravity within a range from 39 GPa to 57 GPa. The glass-ceramic substrate has a surface microstructure in which respective crystal grains present in a surface portion of the substrate are fixed to the surface portion with half or more in volume of the respective crystal grains being exposed above the surface of the glass matrix.Type: GrantFiled: September 3, 1999Date of Patent: December 17, 2002Assignee: Kabushiki Kaisha OharaInventor: Naoyuki Goto
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Patent number: 6458729Abstract: A glass ceramics composition for recording disk substrate contains, essentially, expressed in terms of weight percent on the oxide basis; from 50.5 to 52.5 wt % of SiO2, from 10 to 30 wt % of Al2O3, from 10 to 30 wt % of MgO, and from 4 to 10.6 wt % of TiO2.Type: GrantFiled: July 13, 2000Date of Patent: October 1, 2002Assignee: Minolta Co., Ltd.Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
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Patent number: 6458730Abstract: A glass ceramics composition for recording disk substrate contains, essentially, expressed in terms of weight percent on the oxide basis, from 53.5 to 60 wt % of SiO2, from 10 to 30 wt % of Al2O3, from 10 to 30 wt % of MgO, and from 3.5 to 8.8 wt % of TiO2.Type: GrantFiled: July 13, 2000Date of Patent: October 1, 2002Assignee: Minolta Co., Ltd.Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
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Patent number: 6444598Abstract: An insulator composition which can be sintered at a relatively low temperature and which exhibits a low dielectric constant and a thermal expansion coefficient suitable for forming an insulator layer of a laminated electronic part contains a crystallized glass composition containing SiO2, MgO and CaO as main components, and Al2O3, an amorphous silicate glass composition, and a ceramic composition. The composition ratio by weight % (SiO2, MgO, CaO) of the main components of the crystallized glass composition lies in a region surrounded by point A (30, 25, 45), point B (30, 5, 65), point C (45, 5, 50) and point D (45, 25, 30) shown in a ternary composition diagram thereof. The thermal expansion coefficient of the insulator composition after sintering can easily be changed by changing the content ratio of the crystallized glass composition, the amorphous silicate glass composition and the ceramic composition.Type: GrantFiled: September 6, 2000Date of Patent: September 3, 2002Assignee: Murata Manufacturing Co. LtdInventors: Hiromichi Kawakami, Toshiki Tanaka
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Patent number: 6440883Abstract: An object of the invention is to provide a dielectric porcelain composition with low rate of phase change of a cordierite phase as a primary crystal phase, in which as a result of the low rate of phase change the dielectric constant is from 4.5 to 6 and Q value is 1,000 or more at 60 GHz, and to provide a dielectric resonator and nonradiative dielectric strip using the same. The dielectric porcelain composition comprises, as a principal component, a complex oxide having a molar composition xMgO·yAl2O3·zSiO2 (wherein 10≦x≦40, 10≦y≦40, 20≦z≦80 , and x+y+z=100), and a ratio of a (241) peak intensity &bgr;p(241) and a (222) peak intensity &bgr;p(222) of X-ray diffraction of a &bgr; phase of a 2MgO·2Al2O3·5SiO2 phase, which is a primary crystalline phase of the complex oxide, is 0.8≦&bgr;p(241)/&bgr;p(222)≦1.3.Type: GrantFiled: March 26, 2001Date of Patent: August 27, 2002Assignee: Kyocera CorporationInventor: Takeshi Okamura
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Publication number: 20020098965Abstract: Ceramics containing a diopside crystal phase and a cordierite phase, the remainder being a glass phase and/or other ceramic crystal phases, and having an open porosity of not larger than 1%. The ceramics is obtained by firing at from 800 to 1050° C., and exhibits a dielectric constant of not larger than 7 and a small dielectric loss in a high-frequency region, a ceramic strength of not smaller than 250 MPa, and a coefficient of thermal expansion close to those of the chips such as of Si and Ga—As and of the printed board.Type: ApplicationFiled: November 29, 2001Publication date: July 25, 2002Applicant: KYOCERA CORPORATIONInventors: Yoshitake Terashi, Hiromi Iwachi, Tsutae Iryo
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Patent number: 6391813Abstract: The invention is directed at sintered ceramic articles exhibiting a primary crystalline phase of cordierite and an analytical oxide composition, in weight percent, of 44-53% SiO2, 30-38 Al2O3, 11-16% MgO and 0.05 to 10% of a metal oxide. The ceramic article exhibits a coefficient of thermal expansion in at least one direction no greater than about 15.0×10−7° C. over the temperature range of about 25° C. to about 800° C. The sum of the weight percentages of residual mullite, corundum, and spinel, as measured by X-ray diffractometry of the crushed and powdered body, is not greater than 15%.Type: GrantFiled: December 28, 1999Date of Patent: May 21, 2002Assignee: Corning IncorporatedInventor: Gregory A. Merkel
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Patent number: 6376402Abstract: The glass or glass-ceramic has the following composition (in % by weight based on oxide content): SiO2, 25 to 50; B2O3, >5 to 16; Al2O3, 10 to 17; P2O5, 0 to 8; Li2O,5 to 15; Na2O, 0 to 10; K2O, 0 to 10; MgO, 10 to 30; CaO, 0 to 10; SrO, 0 to 8; ZnO, 0 to 8; TiO2, 0.1 to 10; ZrO2, 0 to 8; and at least one refining agent, in an amount as needed according to its purpose. The sum total amount of divalent metal oxides (RO) present is less or equal to than 45% by weight based on oxide content and the sum total amount of alkali metal oxides (R2O) present is less than or equal to 30% by weight based on oxide content. The glass or glass-ceramic material generally has elasticity modulus values (E)>90×103 N/mm2 and <125×103 N/mm2, specific elasticity modulus values (E/&rgr;)>30×105 N cm/g and <45×105 N cm/g and thermal expansion coefficient values (&agr;20/300)>7.0×10−6/K and <11.0×10−6/K.Type: GrantFiled: April 19, 2000Date of Patent: April 23, 2002Assignee: Schott GlasInventors: Wolfgang Pannhorst, Ute Woelfel, Silke Wolff
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Patent number: 6372676Abstract: A ceramic substrate composition includes about 26 to 48% by weight of a CaO—Al2O3—B2O3—SiO2 type glass, about 35 to 68% by weight of at least one of alumina, mullite, cordierite and forsterite, and about 3 to 24% by weight of quartz, said glass being capable of being crystallized to wollastonite by firing of the composition at a temperature of about 800 to 1000° C. A ceramic circuit component contains a circuit formed on the ceramic substrate obtained by firing the composition.Type: GrantFiled: May 24, 1999Date of Patent: April 16, 2002Assignee: Murata Manufacturing Co., Ltd.Inventors: Kazuo Kishida, Hirofumi Sunahara, Mitsuyoshi Nishide, Hiroshi Takagi
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Publication number: 20020028740Abstract: Enclosed are crystallized glasses suitable for a substrate for an information recording medium such as a magnetic disc, optical disc, or optomagnetic disc, a substrate for information recording medium using such a crystallized glass substrate, and an information recording medium using such a substrate for information recording medium. The crystallized glasses are capable of providing a glass substrate having a high Young's modulus, as well as excellent mechanical strength, surface flatness, and heat resistance and having an excellent surface smoothness upon polishing. Glass substrate having an excellent surface smoothness using such a crystallized glass are also disclosed.Type: ApplicationFiled: July 26, 2001Publication date: March 7, 2002Inventors: Xuelu Zou, Kouji Azegami
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Publication number: 20020013206Abstract: A glass-ceramic which is substantially and desirably totally transparent, and which contains a predominant crystal phase of forsterite. The glass-ceramic is formed from precursor glasses having the following compositions, in weight percent on an oxide basis: SiO2 30-60; Al2O3 10-25; MgO 13-30; K2O 8-20; TiO2 0-10; and GeO2 0-25. The glass-ceramic may be doped with up to 1 wt. % chromium oxide to impart optical activity thereto.Type: ApplicationFiled: August 14, 2001Publication date: January 31, 2002Inventor: George H. Beall
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Publication number: 20010056018Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.Type: ApplicationFiled: April 2, 2001Publication date: December 27, 2001Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
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Publication number: 20010056027Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.Type: ApplicationFiled: April 2, 2001Publication date: December 27, 2001Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
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Publication number: 20010056020Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.Type: ApplicationFiled: April 2, 2001Publication date: December 27, 2001Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
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Publication number: 20010056025Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.Type: ApplicationFiled: April 2, 2001Publication date: December 27, 2001Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
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Publication number: 20010056016Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.Type: ApplicationFiled: April 2, 2001Publication date: December 27, 2001Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
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Publication number: 20010056015Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.Type: ApplicationFiled: April 2, 2001Publication date: December 27, 2001Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
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Publication number: 20010056017Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.Type: ApplicationFiled: April 2, 2001Publication date: December 27, 2001Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
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Publication number: 20010056024Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.Type: ApplicationFiled: April 2, 2001Publication date: December 27, 2001Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
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Publication number: 20010056023Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.Type: ApplicationFiled: April 2, 2001Publication date: December 27, 2001Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
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Publication number: 20010056022Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.Type: ApplicationFiled: April 2, 2001Publication date: December 27, 2001Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
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Publication number: 20010056021Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.Type: ApplicationFiled: April 2, 2001Publication date: December 27, 2001Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
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Publication number: 20010056019Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.Type: ApplicationFiled: April 2, 2001Publication date: December 27, 2001Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
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Publication number: 20010056026Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.Type: ApplicationFiled: April 2, 2001Publication date: December 27, 2001Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
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Publication number: 20010051577Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.Type: ApplicationFiled: April 2, 2001Publication date: December 13, 2001Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
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Publication number: 20010051574Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.Type: ApplicationFiled: April 2, 2001Publication date: December 13, 2001Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
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Publication number: 20010051573Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.Type: ApplicationFiled: April 2, 2001Publication date: December 13, 2001Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
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Publication number: 20010051579Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.Type: ApplicationFiled: April 2, 2001Publication date: December 13, 2001Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
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Publication number: 20010051582Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.Type: ApplicationFiled: April 2, 2001Publication date: December 13, 2001Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
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Publication number: 20010051580Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.Type: ApplicationFiled: April 2, 2001Publication date: December 13, 2001Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
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Publication number: 20010051583Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.Type: ApplicationFiled: April 2, 2001Publication date: December 13, 2001Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
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Publication number: 20010051575Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.Type: ApplicationFiled: April 2, 2001Publication date: December 13, 2001Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru