Magnesium Aluminosilicate (e.g., Cordierite, Etc.) Patents (Class 501/9)
  • Patent number: 6642161
    Abstract: 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: Grant
    Filed: April 2, 2001
    Date of Patent: November 4, 2003
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
  • Patent number: 6642162
    Abstract: 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: Grant
    Filed: April 2, 2001
    Date of Patent: November 4, 2003
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
  • Patent number: 6627565
    Abstract: 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: Grant
    Filed: July 26, 2000
    Date of Patent: September 30, 2003
    Assignee: Hoya Corporation
    Inventors: Xuelu Zou, Katsuaki Uchida
  • Patent number: 6627567
    Abstract: 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: Grant
    Filed: July 13, 2000
    Date of Patent: September 30, 2003
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
  • Patent number: 6624101
    Abstract: 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: Grant
    Filed: July 13, 2000
    Date of Patent: September 23, 2003
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
  • Publication number: 20030171201
    Abstract: 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: Application
    Filed: February 25, 2003
    Publication date: September 11, 2003
    Inventors: Xuelu Zou, Kouji Azegami
  • Patent number: 6610620
    Abstract: 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: Grant
    Filed: July 13, 2000
    Date of Patent: August 26, 2003
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
  • Patent number: 6605554
    Abstract: 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: Grant
    Filed: February 7, 2000
    Date of Patent: August 12, 2003
    Assignee: Colorobbia Italia S.p.A.
    Inventors: Marco Bitossi, Giovanni Baldi, Davide Settembre Blundo, Enrico Generali
  • Patent number: 6596659
    Abstract: 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: Grant
    Filed: July 13, 2000
    Date of Patent: July 22, 2003
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
  • Patent number: 6593259
    Abstract: 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: Grant
    Filed: July 13, 2000
    Date of Patent: July 15, 2003
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
  • Patent number: 6583077
    Abstract: 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: Grant
    Filed: July 13, 2000
    Date of Patent: June 24, 2003
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
  • Patent number: 6583078
    Abstract: 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: Grant
    Filed: July 13, 2000
    Date of Patent: June 24, 2003
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
  • Patent number: 6573206
    Abstract: 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: Grant
    Filed: July 13, 2000
    Date of Patent: June 3, 2003
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
  • Publication number: 20030100434
    Abstract: A low-thermal-expansion, rigid and wear-resistant ceramic is provided.
    Type: Application
    Filed: October 8, 2002
    Publication date: May 29, 2003
    Inventors: Yasuki Yoshitomi, Tadahisa Arahori
  • Patent number: 6569792
    Abstract: 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: Grant
    Filed: July 26, 2001
    Date of Patent: May 27, 2003
    Assignee: Hoya Corporation
    Inventors: Xuelu Zou, Kouji Azegami
  • Patent number: 6569791
    Abstract: 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: Grant
    Filed: July 13, 2000
    Date of Patent: May 27, 2003
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
  • Patent number: 6569790
    Abstract: 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: Grant
    Filed: July 13, 2000
    Date of Patent: May 27, 2003
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
  • Patent number: 6541407
    Abstract: 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: Grant
    Filed: May 29, 2001
    Date of Patent: April 1, 2003
    Assignee: Corning Incorporated
    Inventors: Douglas M. Beall, David L. Hickman, Gregory A. Merkel
  • Patent number: 6495480
    Abstract: 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: Grant
    Filed: September 3, 1999
    Date of Patent: December 17, 2002
    Assignee: Kabushiki Kaisha Ohara
    Inventor: Naoyuki Goto
  • Patent number: 6458729
    Abstract: 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: Grant
    Filed: July 13, 2000
    Date of Patent: October 1, 2002
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
  • Patent number: 6458730
    Abstract: 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: Grant
    Filed: July 13, 2000
    Date of Patent: October 1, 2002
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
  • Patent number: 6444598
    Abstract: 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: Grant
    Filed: September 6, 2000
    Date of Patent: September 3, 2002
    Assignee: Murata Manufacturing Co. Ltd
    Inventors: Hiromichi Kawakami, Toshiki Tanaka
  • Patent number: 6440883
    Abstract: 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: Grant
    Filed: March 26, 2001
    Date of Patent: August 27, 2002
    Assignee: Kyocera Corporation
    Inventor: Takeshi Okamura
  • Publication number: 20020098965
    Abstract: 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: Application
    Filed: November 29, 2001
    Publication date: July 25, 2002
    Applicant: KYOCERA CORPORATION
    Inventors: Yoshitake Terashi, Hiromi Iwachi, Tsutae Iryo
  • Patent number: 6391813
    Abstract: 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: Grant
    Filed: December 28, 1999
    Date of Patent: May 21, 2002
    Assignee: Corning Incorporated
    Inventor: Gregory A. Merkel
  • Patent number: 6376402
    Abstract: 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: Grant
    Filed: April 19, 2000
    Date of Patent: April 23, 2002
    Assignee: Schott Glas
    Inventors: Wolfgang Pannhorst, Ute Woelfel, Silke Wolff
  • Patent number: 6372676
    Abstract: 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: Grant
    Filed: May 24, 1999
    Date of Patent: April 16, 2002
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Kazuo Kishida, Hirofumi Sunahara, Mitsuyoshi Nishide, Hiroshi Takagi
  • Publication number: 20020028740
    Abstract: 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: Application
    Filed: July 26, 2001
    Publication date: March 7, 2002
    Inventors: Xuelu Zou, Kouji Azegami
  • Publication number: 20020013206
    Abstract: 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: Application
    Filed: August 14, 2001
    Publication date: January 31, 2002
    Inventor: George H. Beall
  • Publication number: 20010056018
    Abstract: 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: Application
    Filed: April 2, 2001
    Publication date: December 27, 2001
    Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
  • Publication number: 20010056027
    Abstract: 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: Application
    Filed: April 2, 2001
    Publication date: December 27, 2001
    Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
  • Publication number: 20010056020
    Abstract: 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: Application
    Filed: April 2, 2001
    Publication date: December 27, 2001
    Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
  • Publication number: 20010056025
    Abstract: 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: Application
    Filed: April 2, 2001
    Publication date: December 27, 2001
    Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
  • Publication number: 20010056016
    Abstract: 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: Application
    Filed: April 2, 2001
    Publication date: December 27, 2001
    Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
  • Publication number: 20010056015
    Abstract: 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: Application
    Filed: April 2, 2001
    Publication date: December 27, 2001
    Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
  • Publication number: 20010056017
    Abstract: 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: Application
    Filed: April 2, 2001
    Publication date: December 27, 2001
    Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
  • Publication number: 20010056024
    Abstract: 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: Application
    Filed: April 2, 2001
    Publication date: December 27, 2001
    Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
  • Publication number: 20010056023
    Abstract: 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: Application
    Filed: April 2, 2001
    Publication date: December 27, 2001
    Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
  • Publication number: 20010056022
    Abstract: 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: Application
    Filed: April 2, 2001
    Publication date: December 27, 2001
    Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
  • Publication number: 20010056021
    Abstract: 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: Application
    Filed: April 2, 2001
    Publication date: December 27, 2001
    Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
  • Publication number: 20010056019
    Abstract: 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: Application
    Filed: April 2, 2001
    Publication date: December 27, 2001
    Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
  • Publication number: 20010056026
    Abstract: 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: Application
    Filed: April 2, 2001
    Publication date: December 27, 2001
    Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
  • Publication number: 20010051577
    Abstract: 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: Application
    Filed: April 2, 2001
    Publication date: December 13, 2001
    Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
  • Publication number: 20010051574
    Abstract: 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: Application
    Filed: April 2, 2001
    Publication date: December 13, 2001
    Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
  • Publication number: 20010051573
    Abstract: 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: Application
    Filed: April 2, 2001
    Publication date: December 13, 2001
    Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
  • Publication number: 20010051579
    Abstract: 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: Application
    Filed: April 2, 2001
    Publication date: December 13, 2001
    Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
  • Publication number: 20010051582
    Abstract: 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: Application
    Filed: April 2, 2001
    Publication date: December 13, 2001
    Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
  • Publication number: 20010051580
    Abstract: 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: Application
    Filed: April 2, 2001
    Publication date: December 13, 2001
    Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
  • Publication number: 20010051583
    Abstract: 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: Application
    Filed: April 2, 2001
    Publication date: December 13, 2001
    Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
  • Publication number: 20010051575
    Abstract: 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: Application
    Filed: April 2, 2001
    Publication date: December 13, 2001
    Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru