Sheet Patents (Class 65/90)
  • Patent number: 8375747
    Abstract: A sealing apparatus for use in conveying molten glass from a first vessel to a second vessel, wherein at least a portion of the first vessel is nested within the second vessel without contact between the first and second vessels, and a flexible member comprising a gas-tight seal separates an atmosphere enclosed by the sealing apparatus and an ambient atmosphere. The sealing apparatus is useful for flexibly sealing a non-contact joint between conduits for supplying molten glass to a forming body.
    Type: Grant
    Filed: July 3, 2012
    Date of Patent: February 19, 2013
    Assignee: Corning Incorporated
    Inventors: Gilbert De Angelis, Ronald L. Kimball
  • Publication number: 20130038940
    Abstract: A soda-lime-silica glass for solar collector cover plates and solar mirrors has less than 0.010 weight percent total iron as Fe2O3, a redox ratio of less than 0.350, less than 0.0025 weight percent CeO2, and spectral properties that include a visible transmission, and a total solar infrared transmittance, of greater than 90% at a thickness of 5.5 millimeters, and reduced solarization. In one non-limiting embodiment of invention, the glass is made by heating a pool of molten soda-lime-silica with a mixture of combustion air and fuel gas having an air firing ratio of greater than 11, or an oxygen firing ratio of greater than 2.31. In another non-limiting embodiment of the invention, streams of oxygen bubbles are moved through a pool of molten glass. In both embodiments, the oxygen oxidizes ferrous iron to ferric iron to reduce the redox ratio.
    Type: Application
    Filed: October 17, 2012
    Publication date: February 14, 2013
    Applicant: PPG INDUSTRIES OHIO, INC.
    Inventor: PPG INDUSTRIES OHIO, INC.
  • Patent number: 8365556
    Abstract: One embodiment of the present invention is an improved sheet glass forming apparatus. In another embodiment, a precise thermal control system redistributes the flow of molten glass at the weirs to counteract the degradation of the sheet forming apparatus which inevitably occurs during manufacturing. In yet another embodiment, the invention introduces a counteracting force to the stresses on the trough in a manner such that the thermal creep which inevitably occurs has a minimum impact on the glass flow characteristics of the forming trough. Another embodiment creates a variable external cross-section which provides hydraulic stresses that are in opposition to the surface tension and body force stresses and thus, reduces the influence of surface tension and body forces.
    Type: Grant
    Filed: October 3, 2011
    Date of Patent: February 5, 2013
    Assignee: Corning Incorporated
    Inventor: Richard B. Pitbladdo
  • Publication number: 20130025320
    Abstract: A manufacturing method of a glass substrate for magnetic disk including a pair of principal surfaces is disclosed The method includes the steps of: dropping process for dropping a lump in vertically downward direction, the lump made by cutting molten glass; pressing process for forming a sheet glass material by sandwiching substantially simultaneously the lump from both sides of the dropping path of the lump with surfaces of the pair of dies at the timing when at least a cut mark of the lump protrudes from a pair of dies facing together, and performing press forming to the lump; and removing process for removing the glass material protruding from the pair of dies.
    Type: Application
    Filed: January 31, 2012
    Publication date: January 31, 2013
    Applicant: HOYA CORPORATION
    Inventors: Hideki Isono, Shinji Eda
  • Patent number: 8359887
    Abstract: A method is disclosed for producing sheet glass having two faces, at least one of which has a high surface quality, the method comprising a treatment step wherein a stream of glass is contacted with a forming tool, and wherein a reversible adhesion force exists between the stream of glass and the forming tool after contacting. An apparatus is also disclosed for producing sheet glass according to the disclosed and various other methods of sheet glass manufacture, the apparatus comprising a forming tool having a means for controlling the temperature of at least a portion of the surface thereof.
    Type: Grant
    Filed: November 20, 2008
    Date of Patent: January 29, 2013
    Assignee: Corning Incorporated
    Inventors: Antoine Bisson, Allan Mark Fredholm
  • Publication number: 20120324954
    Abstract: A reactive-ceramming process for making YPO4 ceramics involving the reaction between a YP-glass and a Y-source material. The invention can be used to synthesize, inter alia, phase-pure YPO4 ceramic material 5 at a relatively low temperature in a relatively short period of time and at a low cost. Invention can be used to make large piece of YPO4 blocks suitable for, e.g., an isopipe in a fusion down-draw process for making large-size glass sheets.
    Type: Application
    Filed: February 25, 2011
    Publication date: December 27, 2012
    Inventors: Lisa Ann Lamberson, Robert Michael Morena
  • Publication number: 20120318024
    Abstract: A manufacturing method for a glass roll includes drawing a glass film downward vertically from a forming device, converting a delivery direction of the glass film from a vertical direction to a horizontal direction, continuously delivering the glass film to a downstream side by a horizontal conveyance section, and rolling the glass film into a roll shape on a downstream side of the horizontal conveyance section. While the glass film is supported in surface contact by an endless belt serving as a support section, which is provided in the horizontal conveyance section, a rolling force equal to or less than a static friction force, which is generated by a self-weight of the glass film between the glass film and the endless belt, is imparted to the glass film.
    Type: Application
    Filed: May 16, 2012
    Publication date: December 20, 2012
    Inventors: Koichi MORI, Akio NAKABAYASHI
  • Patent number: 8324123
    Abstract: To provide a glass plate which has a low B2O3 content and which can be used as a glass plate for e.g. an LCD panel. A glass plate which comprises, as a glass matrix composition as represented by mass % based on oxide, from 53 to 74 mass % of SiO2, from 15 to 23 mass % of Al2O3, from 0 to 3 mass % of B2O3, from 2 to 17 mass % of MgO, from 0 to 12 mass % of CaO, from 0 to 6 mass % of SrO, from 6 to 28 mass % of MgO+CaO+SrO, from 0 to 9 mass % of Na2O, from 0 to 6 mass % of K2O and from 0.8 to 11 mass % of Na2O+K2O, contains from 100 to 500 ppm of SO3, has an average coefficient of thermal expansion from 50 to 350° C. of at most 60×10?7/° C., and has a strain point of at least 600° C.
    Type: Grant
    Filed: January 26, 2010
    Date of Patent: December 4, 2012
    Assignee: Asahi Glass Company, Limited
    Inventors: Yuya Shimada, Manabu Nishizawa, Junichiro Kase
  • Patent number: 8322160
    Abstract: A process produces a glass sheet. The process includes down-drawing a molten glass into a sheet-like glass ribbon, in which the molten glass is fed to a forming trough arranged in a forming furnace and the molten glass is caused to flow down from the forming trough through a conveyance passage extending vertically. The process also includes removing an internal strain in the glass ribbon in an annealing furnace, cooling the glass ribbon to around room temperature, and cutting the glass ribbon in a given size, in which a pressure in an outside atmosphere of the forming furnace and/or the annealing furnace is elevated.
    Type: Grant
    Filed: December 10, 2008
    Date of Patent: December 4, 2012
    Assignee: Nippon Electric Glass Co., Ltd.
    Inventors: Noritomo Nishiura, Koki Ueda, Hidetaka Oda, Tomonori Kano, Daisuke Nagata
  • Patent number: 8322161
    Abstract: A process produces a glass sheet. The process includes down-drawing a molten glass into a sheet-like glass ribbon, in which the molten glass is fed to a forming trough arranged in a forming furnace and the molten glass is caused to flow down from the forming trough through a conveyance passage extending vertically. The process also includes removing an internal strain in the glass ribbon in an annealing furnace, cooling the glass ribbon to around room temperature in a cooling chamber, and cutting the glass ribbon into a given size, in which the cooling chamber is provided with a gas exhausting passage, thereby exhausting air in the cooling chamber to an outside.
    Type: Grant
    Filed: December 10, 2008
    Date of Patent: December 4, 2012
    Assignee: Nippon Electric Glass Co., Ltd.
    Inventors: Noritomo Nishiura, Koki Ueda, Hidetaka Oda, Tomonori Kano, Daisuke Nagata
  • Publication number: 20120272686
    Abstract: A disk roll base material includes 25 to 50 wt % of ceramic wool, 5 to 30 wt % of kibushi clay, 2 to 20 wt % of bentonite, and 25 to 45 wt % of a filler selected from alumina, wollastonite and calcined kaolin clay.
    Type: Application
    Filed: May 1, 2012
    Publication date: November 1, 2012
    Applicant: NICHIAS CORPORATION
    Inventors: Osamu Horiuchi, Kazuhisa Watanabe, Masaaki Nakayama
  • Publication number: 20120260695
    Abstract: One embodiment of the present invention is an improved sheet glass forming apparatus. In another embodiment, a precise thermal control system redistributes the flow of molten glass at the weirs to counteract the degradation of the sheet forming apparatus which inevitably occurs during manufacturing. In yet another embodiment, the invention introduces a counteracting force to the stresses on the trough in a manner such that the thermal creep which inevitably occurs has a minimum impact on the glass flow characteristics of the forming trough. Another embodiment creates a variable external cross-section which provides hydraulic stresses that are in opposition to the surface tension and body force stresses and thus, reduces the influence of surface tension and body forces.
    Type: Application
    Filed: October 3, 2011
    Publication date: October 18, 2012
    Inventor: Richard B. Pitbladdo
  • Publication number: 20120260696
    Abstract: A refractory object can include at least 10 wt % Al2O3. Further, the refractory object may contain less than approximately 6 wt % SiO2 or may include a dopant that includes an oxide of Ti, Mg, Ta, Nb, or any combination thereof. In an embodiment, at least approximately 1% of the Al2O3 in the refractory object can be provided as reactive Al2O3. In another embodiment, the refractory object may have a density of at least approximately 3.55 g/cc, a corrosion rate of no greater than approximately 2.69 mm/year, or any combination of the foregoing. In a particular embodiment, the refractory object can be used to form an Al—Si—Mg glass sheet. In an embodiment, the refractory object may be formed by a process using a compound of Ti, Mg, Ta, Nb, or any combination thereof.
    Type: Application
    Filed: March 30, 2012
    Publication date: October 18, 2012
    Applicant: SAINT-GOBAIN CERAMICS & PLASTICS, INC.
    Inventors: Olivier Citti, Andrea L. Kazmierczak
  • Publication number: 20120255327
    Abstract: A disk roll base material includes 20 to 38 wt % of alumina silicate wool that include 40 to 60 wt % of alumina and 40 to 60 wt % of silica, and have a content of shots having a dimension of 45 ?m or more of 5 wt % or less, 10 to 30 wt % of kibushi clay, 2 to 20 wt % of bentonite, and 20 to 40 wt % of mica.
    Type: Application
    Filed: April 5, 2011
    Publication date: October 11, 2012
    Applicant: Nichias Corporation
    Inventors: Kazuhisa Watanabe, Masaaki Nakayama, Osamu Horiuchi
  • Patent number: 8281618
    Abstract: The invention provides an alkali-free glass substrate small in the variation of the thermal shrinkage and a process for producing the same. An alkali-free glass substrate of the invention has an absolute value of a thermal shrinkage of 50 ppm or more when the alkali-free glass substrate is heated at a rate of 10° C./min from a room temperature, kept at a holding temperature of 450° C. for 10 hr and then cooled at a rate of 10° C./min.
    Type: Grant
    Filed: December 15, 2006
    Date of Patent: October 9, 2012
    Assignee: Nippon Electric Glass Co., Ltd.
    Inventors: Yoshinari Kato, Tatsuya Takaya
  • Publication number: 20120247155
    Abstract: A method of manufacturing a glass blank for a magnetic recording medium glass substrate in which, after a pair of press molds placed so as to be opposed to each other in a horizontal direction with press-molding surfaces thereof and the temperatures of the press-molding surfaces being substantially the same are brought into contact with a molten glass gob substantially at the same time, press molding is carried out to produce plate glass and the plate glass continues to be pressed with the pair of molds, and then, when the plate glass is taken out, the duration time of pressing the plate glass is controlled so that the flatness of the glass blank is 10 ?m or less, and a method of manufacturing a magnetic recording medium glass substrate, a method of manufacturing a magnetic recording medium, and an apparatus for manufacturing a glass blank for a magnetic recording medium glass substrate using the same.
    Type: Application
    Filed: November 15, 2011
    Publication date: October 4, 2012
    Applicant: HOYA CORPORATION
    Inventors: Akira MURAKAMI, Makoto OSAWA, Nobuhiro SUGIYAMA, Takashi SATOU, Hidekazu TANINO, Hideki ISONO, Kinobu OSAKABE, Takao MOTOHASHI
  • Patent number: 8245538
    Abstract: A method for manufacturing a glass substrate by a fusion process includes flowing fused glass into a fusion pipe, and gradually cooling and solidifying the fused glass by allowing the glass to flow downward from the fusion pipe. An asperity is formed on a surface of the glass substrate by fastening and pressing the glass toward a direction of thickness of the glass with a pair of transfer rollers while the glass is flowing down from the fusion pipe.
    Type: Grant
    Filed: August 13, 2009
    Date of Patent: August 21, 2012
    Assignee: Nikon Corporation
    Inventors: Yukiyasu Kimura, Yuhei Nitta
  • Patent number: 8241751
    Abstract: Provided is a glass roll formed by winding a glass film into a roll, in which a minimum winding radius of the glass film is optimized. Thus, the glass film is reliably prevented from breaking due to static fatigue, and is able to be stored for long periods. A glass roll (1), which is formed by winding a glass film (2) into a roll, has a configuration in which the glass film has a minimum winding radius (R) satisfying the following relation: R?(T/2)[(2.3/?)×E?1], where ? represents flexural strength of the glass film (2) obtained by a 3-point bending test, T represents a thickness of the glass film, and E represents a Young's modulus of the glass film.
    Type: Grant
    Filed: September 30, 2009
    Date of Patent: August 14, 2012
    Assignee: Nippon Electric Glass Co., Ltd.
    Inventors: Masahiro Tomamoto, Michiharu Eta, Hidetaka Oda, Tatsuya Takaya, Yasuo Yamazaki, Hiroshi Takimoto, Shinichi Ishibashi, Keiji Takagi, Daisuke Nagata, Takahide Nakamura, Toru Sakurabayashi, Katsutoshi Fujiwara, Mitsuharu Noda, Yasuhiko Ogiso, Takahide Fujii
  • Patent number: 8242352
    Abstract: The invention provides a solar concentrator structure including a first concentrating element. The first concentrating element includes a first aperture region, a first exit region, a first side and a second side. The solar concentrator structure further includes a second or more concentrating elements integrally coupled with the first concentrating element in a parallel manner. The second concentrating element includes a second aperture region, a second exit region, the third side, and a fourth side. The third side joins with the second side to form an apex notch structure characterized by a radius of curvature. Additionally, the solar concentrator structure includes a separation region by a width separating the first exit region from the second exit region and a triangular region including the apex notch structure and a base defined by the separation region and a refractive index of about 1 characterizing the triangular region.
    Type: Grant
    Filed: September 28, 2011
    Date of Patent: August 14, 2012
    Assignee: Solaria Corporation
    Inventor: Kevin R. Gibson
  • Patent number: 8242351
    Abstract: A solar cell concentrator structure includes a first concentrator element having a first aperture region and a first exit region including a first back surface region and a first corner region. The structure also includes a second concentrator element integrally formed with the first concentrator element. The second concentrator element includes a second aperture region and a second exit region-including a second back surface region and a second corner region. Additionally, the structure includes a first radius of curvature of 0.10 mm and less characterizing the first corner structure and the second corner structure, a first coupling region between the first exit region and a first surface region of a first photovoltaic device. The structure further includes a second radius of curvature of 0.10 mm and less characterizing a region between the first concentrator element and the second concentrator element.
    Type: Grant
    Filed: June 28, 2011
    Date of Patent: August 14, 2012
    Assignee: Solaria Corporation
    Inventors: Kevin R. Gibson, Alelie Funcell
  • Patent number: 8234882
    Abstract: The invention relates to a method for producing iridescent crystal glass. The glass products produced with the method of present invention have the advantages of good streamline shape, natural color transition, and excellent visual effect, etc.; the method is helpful for accelerating product upgrade, improving product appearance and visual effects, and enhancing competence of products. Therefore, we paint iridescent crystal ink on glass products, and add patterns suitable for household electric appliances and buildings, thereby greatly improving the appearance of the product. In addition, due to the high safety performance of toughened glass and suitability of patterns and colors, iridescent crystal glass products have been accepted by the consumers gradually. The method comprises the following steps: a. cutting; b. edge processing; c. toughening; d. ink preparation; e. iridescent crystal printing; f.
    Type: Grant
    Filed: September 11, 2009
    Date of Patent: August 7, 2012
    Assignee: Jiangsu Xiuqiang Glasswork Co., Ltd.
    Inventor: Xiuqiang Lu
  • Patent number: 8211505
    Abstract: A laminated sheet includes a surface layer having an optical surface that is of fire-polished quality and a core layer having a higher modulus than the surface layer to increase an overall stiffness or fracture toughness of the laminated sheet.
    Type: Grant
    Filed: February 25, 2009
    Date of Patent: July 3, 2012
    Assignee: Corning Incorporated
    Inventors: Peter L. Bocko, David Chen, Glen B. Cook, Frank T. Coppola, Victoria A. Edwards, Gunilla E. Gillberg, Josef C. Lapp, Randy L. Rhoads, David A. Tammaro, Butchi R. Vaddi
  • Patent number: 8210001
    Abstract: In a method of making a glass sheet using an overflow fusion downdraw process, a glass sheet quality metric level Q1 is selected, where Q1 is a measure of allowable retardation in the glass sheet. A glass ribbon temperature T1 at which a potential glass ribbon thermal artifact could occur in a glass ribbon while the glass ribbon is being drawn through a drawing machine enclosure is identified. A thermal artifact envelope E1 is determined, where E1 contains types of glass ribbon thermal artifacts allowable at T1 and Q1. A glass melt is overflowed from an isopipe to form a glass ribbon at the root of the isopipe. The glass ribbon is drawn below the root of the isopipe through the drawing machine enclosure to form the glass sheet.
    Type: Grant
    Filed: November 10, 2010
    Date of Patent: July 3, 2012
    Assignee: Corning Incorporated
    Inventors: Douglas Clippinger Allan, Kenneth William Aniolek, Kiat Chyai Kang, Eunyoung Park
  • Publication number: 20120151967
    Abstract: There are provided, a method for efficiently manufacturing a glass substrate for magnetic disk in which the degree of surface irregularity of the principal surface is suppressed, and the glass substrate for magnetic disk. When manufacturing a glass substrate for magnetic disk including a pair of principal surfaces, a glass blank is formed by pressing molten glass or softened glass with planar press forming surfaces of dies in such a way that the molten glass or the softened glass is sandwiched from the both sides. Temperature condition is equalized around the pair of principal surfaces of the glass blank during the pressing.
    Type: Application
    Filed: March 31, 2011
    Publication date: June 21, 2012
    Inventors: Shinji Eda, Hideki Isono
  • Publication number: 20120144865
    Abstract: The present invention provides a manufacturing method of a sheet glass material excellent in flatness. A manufacturing method of glass substrate for magnetic disk including a pair of principal surfaces, the method comprising the steps of: dropping process for dropping a lump of molten glass; pressing process for forming a sheet glass material by performing press forming to the lump while sandwiching the lump from both sides of the dropping path of the lump with facing surfaces of a pair of dies, the pair of dies being set to substantially the same temperature; and processing process for processing the sheet glass material, while the lump drops down while revolving around its dropping axis.
    Type: Application
    Filed: December 7, 2011
    Publication date: June 14, 2012
    Applicant: HOYA CORPORATION
    Inventors: Shinji EDA, Hideki Isono, Akira Murakami
  • Patent number: 8196431
    Abstract: Methods for controlling thickness variations across the width of a glass ribbon (104) are provided. The methods employ a set of thermal elements (106) for locally controlling the temperature of the ribbon (104). The operating values for the thermal elements (106) are selected using an iterative procedure in which thickness variations measured during a given iteration are employed in a mathematical procedure which selects the operating values for the next iteration. In practice, the method can bring thickness variations of glass sheets within commercial specifications in just a few iterations, e.g., 2-4 iterations.
    Type: Grant
    Filed: May 20, 2009
    Date of Patent: June 12, 2012
    Assignee: Corning Incorporated
    Inventors: Steven Roy Burdette, Vladislav Y Golyatin, Gautam Meda, Randy Lee Rhoads
  • Publication number: 20120132269
    Abstract: A glass substrate may be processed at high temperatures without substantially losing its thermal-strengthening characteristics or deforming. In some examples, the glass substrate exhibits an increased annealing point and/or softening point as compared to standard glass substrates. In some examples, the glass substrate includes a relatively high amount of CaO and/or MgO, and/or a relatively low amount of Na2O, as compared to traditional soda-lime-silica-based glass. Depending on the composition, the glass substrate may be useful, for example, to fabricate a glass-based solar cell that mates two substantially flat glass substrates together.
    Type: Application
    Filed: May 20, 2011
    Publication date: May 31, 2012
    Applicant: CARDINAL FG COMPANY
    Inventors: Brad Hickman, Patrick D. Watson, Kelly J. Busch
  • Publication number: 20120125050
    Abstract: A method for manufacturing a glass plate includes preparing an accommodating part made of platinum or a platinum alloy, fining molten glass of a melted feedstock, stirring and homogenizing the molten glass, and supplying the molten glass to a forming apparatus. The fining the molten glass includes causing gas bubbles to float up and out from the molten glass, and causing absorption of the gas component in the molten glass and eliminating gas bubbles. The water vapor partial pressure of an atmosphere in the causing the gas bubbles is lower than the water vapor partial pressure in at least a portion of the causing the absorption of the gas component. A boundary between the causing the gas bubbles and the causing the absorption of the gas component is a temperature lower than the maximum temperature by 30° C. or more after the molten glass has reached the maximum temperature.
    Type: Application
    Filed: September 29, 2011
    Publication date: May 24, 2012
    Applicant: AVANSTRATE INC.
    Inventor: Tsugunobu Murakami
  • Patent number: 8181485
    Abstract: An ultra-thin glass sheet is formed using a roll-to-roll glass soot deposition and sintering process. The sintering involves initially heating and sintering one or more central segments of a glass soot sheet, and progressively heating and sintering glass soot sheet segments that are located laterally or axially adjacent to previously-sintered segments such that, along respective width directions of the glass soot sheet, only a portion of the width is sintered at a given time interval during the heating.
    Type: Grant
    Filed: June 19, 2009
    Date of Patent: May 22, 2012
    Assignee: Corning Incorporated
    Inventors: Calvin Thomas Coffey, Daniel Warren Hawtof, Stanley Zinn
  • Patent number: 8176753
    Abstract: An apparatus for making a glass sheet includes a forming wedge with a pair of inclined forming surface portions converging along a downstream direction to form a root. The apparatus further includes an edge director intersecting with at least one of the pair of downwardly inclined forming surface portions, and a thermal shield configured to reduce heat loss from the edge director. Methods are also provided for reducing heat loss from the edge director with a thermal shield.
    Type: Grant
    Filed: February 26, 2010
    Date of Patent: May 15, 2012
    Assignee: Corning Incorporated
    Inventors: Ahdi El Kahlout, Soongyup Jason Lee, Shinya Sakamoto
  • Patent number: 8173890
    Abstract: A solar cell concentrator structure includes a first concentrator element having a first aperture region and a first exit region including a first back surface region and a first corner region. The structure also includes a second concentrator element integrally formed with the first concentrator element. The second concentrator element includes a second aperture region and a second exit region-including a second back surface region and a second corner region. Additionally, the structure includes a first radius of curvature of 0.25 mm and less characterizing the first corner structure and the second corner structure, a first coupling region between the first exit region and a first surface region of a first photovoltaic device. The structure further includes a second radius of curvature of 0.15 mm and less characterizing a region between the first concentrator element and the second concentrator element.
    Type: Grant
    Filed: January 26, 2009
    Date of Patent: May 8, 2012
    Assignee: Solaria Corporation
    Inventors: Kevin R. Gibson, Alelie Funcell
  • Patent number: 8168884
    Abstract: A solar cell concentrator structure includes a first concentrator element having a first aperture region and a first exit region including a first back surface region and a first corner region. The structure also includes a second concentrator element integrally formed with the first concentrator element. The second concentrator element includes a second aperture region and a second exit region-including a second back surface region and a second corner region. Additionally, the structure includes a first radius of curvature of 0.25 mm and less characterizing the first corner structure and the second corner structure, a first coupling region between the first exit region and a first surface region of a first photovoltaic device. The structure further includes a second radius of curvature of 0.15 mm and less characterizing a region between the first concentrator element and the second concentrator element.
    Type: Grant
    Filed: January 7, 2009
    Date of Patent: May 1, 2012
    Assignee: Solaria Corporation
    Inventors: Kevin R. Gibson, Alelie Funcell
  • Publication number: 20120096900
    Abstract: In a method of manufacturing a glass molding, a lower mold includes a recess having a bottom portion and a side portion surrounding the bottom portion, and an outer peripheral planar portion surrounding an upper end of the side portion. A crossing angle between the side portion and the outer peripheral planar portion is set at more than or equal to 45 degrees. A dropping volume of the molten glass drop is such that, when dropped onto the lower mold, a volume of the molten glass drop located above the outer peripheral planar portion is 1.5 times to 6.0 times the volume of the molten glass drop filling the recess.
    Type: Application
    Filed: September 20, 2011
    Publication date: April 26, 2012
    Inventor: Kazuyuki Ogura
  • Patent number: 8141388
    Abstract: A glass manufacturing system and a method are described herein that use an enhanced temperature control device to help manufacture a uniformly thick glass sheet that is substantially stress free. In one example, the enhanced temperature control device includes an array of temperature controlled elements and a radiation collimator which together cool the glass sheet with a high degree of spatial resolution so as to reduce stress in the glass sheet and control the thickness of the glass sheet.
    Type: Grant
    Filed: May 26, 2010
    Date of Patent: March 27, 2012
    Assignee: Corning Incorporated
    Inventor: Steven R. Burdette
  • Publication number: 20120052275
    Abstract: Provided is a cover glass having a down-drawable composition including, in mass percent: 50%-70% SiO2, 5%-20% Al2O3, 6%-20% Na2O, 0%-10% K2O, 0%-10% MgO, above 2%-20% CaO, and 0%-4.8% ZrO2 wherein, (i) 46.5%?(SiO2?½Al2O3)?59%, (ii) 0.3<CaO/RO, where RO represents a total mass percent of one or more compounds selected from the group consisting of MgO, CaO, SrO and BaO included in the glass substrate, (iii) SrO+BaO<10%, (iv) 0?(ZrO2+TiO2)/SiO2)<0.07, and (v) 0?B2O3/R12O<0.1, where R12O represents a total mass percent of one or more compounds selected from the group consisting of Li2O, Na2O and K2O included in the glass substrate.
    Type: Application
    Filed: August 26, 2011
    Publication date: March 1, 2012
    Applicants: AVANSTRATE INC., HOYA CORPORATION
    Inventors: Kazuaki HASHIMOTO, Tetsuo TAKANO, Akihiro KOYAMA, Mikiko MORISHITA
  • Publication number: 20120047952
    Abstract: A creep-resistant zircon article and a method of manufacturing the creep-resistant zircon article are described herein. In one example, the creep-resistant zircon article has the shape of a forming apparatus (e.g., isopipe) which is used in the fusion process to manufacture glass sheets.
    Type: Application
    Filed: August 9, 2011
    Publication date: March 1, 2012
    Inventors: William P. Addiego, Michael J. Bennett
  • Patent number: 8113015
    Abstract: Methods for controlling the bow (shape) of a vertical glass ribbon (13) produced by a downdraw process are provided. The methods involve passing the ribbon (13) through a gas-filled vertical enclosure (23), e.g., a draw tower, whose bottom (31) is open to the atmosphere. The ribbon (13) acts as a septum that divides the enclosure's internal volume (29) into a first sub-volume (25) and a second sub-volume (27). Using the stack effect, a positive pressure difference is produced between the first sub-volume (25) and the second sub-volume (27) along at least a portion of the length of the enclosure (the DDZ). The edges of the ribbon (13) are constrained so that they do not move into the second sub-volume (27) over at least the DDZ. As a result, the ribbon bows with its concavity facing the first sub-volume (25) and its convexity facing the second sub-volume (27).
    Type: Grant
    Filed: June 17, 2009
    Date of Patent: February 14, 2012
    Assignee: Corning Incorporated
    Inventor: Steven R. Burdette
  • Publication number: 20120009386
    Abstract: A glass having excellent resistance against surface damages is provided. The glass includes a content of alkaline earth oxides of at least 0.3% by weight and of P2O5 of 0.1 to 4% by weight; the glass has at least one surface that has precipitations with a mean size of 1 to 20 ?m. A method is further provided and includes melting a glass batch, yielding a glass melt, and casting the glass melt onto a float bath. The glass melt is maintained on the float bath at a temperature of above 1000° C. for at least 5 minutes, and yields glass. The glass has a content of alkaline earth oxides of at least 0.3% by weight and of P2O5 of 0.1 to 4% by weight, and the glass has at least one surface that has precipitations with a mean size of 1 to 20 ?m.
    Type: Application
    Filed: July 8, 2011
    Publication date: January 12, 2012
    Inventors: Friedrich Siebers, Bernd Ruedinger, Andreas Langsdorf, Markus Heiss
  • Publication number: 20110317431
    Abstract: Provided are an optical element and a method for manufacturing the optical element, wherein the concave optical surface of the optical element does not adhere to the metal mold convex surface and excellent mold releasability is ensured by providing the end surface of the optical element with an end section which is continuous to the outer end section of the concave optical surface of the optical element and providing the end section with a tapered section having a tilt with respect to the flat surface formed by the outer end section of the concave optical surface at the time of forming the optical element by means of a liquid drop method. The tapered section can be used for alignment at the time of assembling the light emitting unit, and contributes to process time reduction and prevention of generation of failures.
    Type: Application
    Filed: March 3, 2010
    Publication date: December 29, 2011
    Inventor: Shuji Ikenaga
  • Patent number: 8067326
    Abstract: Refractory materials are provided which contain P2O5/R2O3 constituents, where R is Y, Sc, Er, Lu, Yb, Tm, Ho, Dy, Tb, Gd, or a combination thereof, and/or V2O5/R?2O3 constituents where R? is Y, Sc, one or more rare earth elements, or a combination thereof. In certain embodiments, the refractory materials are xenotime-type materials and/or xenotime-stabilized zircon-type materials. The refractory materials can be used in the manufacture of glass and glass-ceramics. For example, the refractory materials, especially those that contain P2O5/R2O3 constituents, can be used as forming structures (“isopipes”) in the fusion process for making flat sheets of glass such as the glass sheets used as substrates in the manufacture of flat panel displays.
    Type: Grant
    Filed: December 21, 2005
    Date of Patent: November 29, 2011
    Assignee: Corning Incorporated
    Inventors: Hilary Tony Godard, Cameron Wayne Tanner, Michelle M Wallen, Elizabeth Margaret Wheeler
  • Publication number: 20110277506
    Abstract: A method for heating glass sheets includes alternately loading on a conveyor system two different sets of glass sheets with the glass sheets of each set having different properties than those of the other set so as to require different heating than each other; conveying the alternately loaded sets of glass sheets on the conveyor system along a plane of conveyance through a heating chamber having a heating system; and controlling operation of the heating system to provide two different sets of heating zones alternating along the direction of conveyance and respectively moving with the two sets of glass sheets so as to provide heating in the heating chamber of each set of glass sheets as required and in a different way than the heating of the other set of glass sheets.
    Type: Application
    Filed: May 14, 2010
    Publication date: November 17, 2011
    Applicant: GLASSTECH, INC.
    Inventors: Troy R. Lewandowski, James P. Schnabel, JR.
  • Publication number: 20110277508
    Abstract: Provided is a method of manufacturing a glass blank for a magnetic recording medium glass substrate, including: manufacturing a glass blank by at least press molding a falling molten glass gob with a pair of press molds both so as to face each other in a direction perpendicular to a direction in which the molten glass gob falls, in which: the molten glass gob is formed of a glass material having a glass transition temperature of 600° C. or more; and when the press molding is carried out so that the molten glass gob is completely extended by pressure and molded into a flat glass between press-molding surfaces of the pair of press molds, at least a region in contact with the flat glass in each of the press-molding surfaces of the pair of press molds forms a substantially flat surface.
    Type: Application
    Filed: March 24, 2011
    Publication date: November 17, 2011
    Applicant: HOYA CORPORATION
    Inventors: Makoto OSAWA, Akira MURAKAMI, Nobuhiro SUGIYAMA, Takashi SATOU, Naomi MATSUMOTO, Youichi HACHITANI, Kinobu OSAKABE, Hideki ISONO, Hidekazu TANINO, Takao MOTOHASHI
  • Patent number: 8056365
    Abstract: One embodiment of the present invention is an improved sheet glass forming apparatus. In another embodiment, a precise thermal control system redistributes the flow of molten glass at the weirs to counteract the degradation of the sheet forming apparatus which inevitably occurs during manufacturing. In yet another embodiment, the invention introduces a counteracting force to the stresses on the trough in a manner such that the thermal creep which inevitably occurs has a minimum impact on the glass flow characteristics of the forming trough. Another embodiment creates a variable external cross-section which provides hydraulic stresses that are in opposition to the surface tension and body force stresses and thus, reduces the influence of surface tension and body forces. In an alternative embodiment, the glass is preferentially cooled across its width to create forming stresses during solidification, which ensures that the glass sheet drawn is inherently flat.
    Type: Grant
    Filed: October 30, 2006
    Date of Patent: November 15, 2011
    Assignee: Corning Incorporated
    Inventor: Richard B. Pitbladdo
  • Patent number: 8049098
    Abstract: The invention provides a solar concentrator structure including a first concentrating element. The first concentrating element includes a first aperture region, a first exit region, a first side and a second side. The solar concentrator structure further includes a second or more concentrating elements integrally coupled with the first concentrating element in a parallel manner. The second concentrating element includes a second aperture region, a second exit region, the third side, and a fourth side. The third side joins with the second side to form an apex notch structure characterized by a radius of curvature. Additionally, the solar concentrator structure includes a separation region by a width separating the first exit region from the second exit region and a triangular region including the apex notch structure and a base defined by the separation region and a refractive index of about 1 characterizing the triangular region.
    Type: Grant
    Filed: August 28, 2008
    Date of Patent: November 1, 2011
    Assignee: Solaria Corporation
    Inventor: Kevin R. Gibson
  • Patent number: 8042361
    Abstract: The present invention significantly modifies “The Overflow Process”. It includes a method and apparatus for measuring glass flow rate and maintaining a constant glass flow rate. It also embodies design features and methods that support and stress the forming apparatus in a manner such that the deformation that results from thermal creep is corrected, thus minimizing the effect of the thermal creep on the thickness variation of the glass sheet. The present invention also embodies design features that change the process from a single step (combined flow distribution and cooling) to a two step process; step one being flow distribution and step two being cooling.
    Type: Grant
    Filed: July 19, 2005
    Date of Patent: October 25, 2011
    Assignee: Corning Incorporated
    Inventor: Richard B. Pitbladdo
  • Patent number: 8037716
    Abstract: Methods and apparatus for controlling the stress in, and the shape of, the glass ribbon (15) formed in a downdraw glass manufacturing process (e.g., the fusion downdraw process) are provided. In certain embodiments, the control is achieved by cooling the bead portions (21a, 21b) of the ribbon (15) at a rate which provides a heat flux Q?b at the thickest part of the bead (23a, 23b) which is given by Q?b=Q?q+?Q?, where (i) Q?q is the heat flux at a transverse position adjacent to the bead portion (21a, 21b) at which the ribbon's thickness equals 1.05*tcenter, where tcenter is the final thickness at the ribbon's center line (17), and (ii) ?Q??(tb/tq?1)Q?q+10 kilowatts/meter2, where tb is the thickness of the thickest part of the bead portion. The cooling can take place along the entire length of the ribbon (15) or at selected locations, e.g.
    Type: Grant
    Filed: February 27, 2009
    Date of Patent: October 18, 2011
    Assignee: Corning Incorporated
    Inventors: Kenneth William Aniolek, Steven Roy Burdette, Liam Ruan de Paor, Eunyoung Park
  • Publication number: 20110247546
    Abstract: A ribbon crystal has a body with a width dimension, and string embedded within the body. The string has a generally elongated cross-sectional shape. This cross-section (of the string) has a generally longitudinal axis that diverges with the width dimension of the ribbon crystal body.
    Type: Application
    Filed: April 5, 2011
    Publication date: October 13, 2011
    Applicant: EVERGREEN SOLAR, INC.
    Inventors: Christine Richardson, Weidong Huang, Richard L. Wallace, Daniel Doble, Scott Reitsma
  • Patent number: 8033137
    Abstract: Methods for reducing stress on an isopipe during manufacture of a drawn glass sheet are disclosed including a method comprising providing an isopipe having a root, heating the isopipe to a predetermined temperature, maintaining the isopipe at the predetermined temperature for a period of time sufficient to relieve at least a portion of a tensile stress on the isopipe root, coupling the isopipe to a down-comer, and then providing glass to the isopipe. Also disclosed is a method comprising heating an isopipe such that the temperature difference between the weir and the root of the isopipe, after heating and prior to coupling, is less than about 100° C. A method comprising application of a compressive force to the ends of an isopipe root during heating is also disclosed.
    Type: Grant
    Filed: February 8, 2008
    Date of Patent: October 11, 2011
    Assignee: Corning Incorporated
    Inventors: Steven F Hoysan, Steven Michael Milillo, William Robert Powell
  • Publication number: 20110244207
    Abstract: Provided is a method of manufacturing a thin glass plate, including: pouring a molten glass (Gm) into an overflow groove (2) formed in a top of a forming body (1); allowing the molten glass (Gm) which is overflown from the overflow groove (2) over both sides of the overflow groove (2) to flow downward along an outer surface portion (4) having a substantially wedge-like shape of the forming body (1); and fusing and integrating the molten glass at a lower end of the forming body (1), thereby forming a thin glass plate (G) having a thickness equal to or less than 500 ?m. In doing so, in order to suppress a releasing amount of a primary zircon crystal grain included in a surface of the forming body (1), a viscosity of the molten glass (Gm) flowing on an outer surface of the forming body (1) is controlled to be equal to or higher than 3,000 dPa·s and equal to or lower than 30,000 dPa·s throughout the outer surface of the forming body (1).
    Type: Application
    Filed: March 3, 2011
    Publication date: October 6, 2011
    Inventors: Tatsuya TAKAYA, Keiji Takagi, Michiharu Eta, Yuji Iwama
  • Publication number: 20110236633
    Abstract: Provided is a thin glass plate manufacturing apparatus by: pouring a molten glass (G) into an overflow trough (2) formed in a top of a forming body (1); allowing the molten glass (G) which is overflown from the overflow trough (2) over a top planar portion (3) of the forming body (1) on each side of the overflow trough (2) to flow downward along an outer surface portion (4) having a substantially wedge-like shape of the forming body (1); and fusing and integrating the molten glass (G) at a lower end of the forming body (1), thereby forming a thin glass plate having a thickness equal to or less than 500 ?m, in which a molten glass contact surface of at least the top planar portion (3) of an outer surface of the forming body (1) has a maximum height roughness (Rz) of equal to or less than 10 ?m.
    Type: Application
    Filed: March 2, 2011
    Publication date: September 29, 2011
    Inventors: Tatsuya TAKAYA, Keiji Takagi, Michiharu Eta