Sheet Patents (Class 65/90)
  • Patent number: 10392288
    Abstract: Disclosed herein are apparatuses and methods for drawing sheet glass. More particularly, one or more sets of edge rolls can be configured to have a rotation axis angled away from a line orthogonal to the direction of flow of a ribbon of glass and positioned so as to contact the glass in the viscous region of the draw. Through control over the orientation and position of the one or more sets of edge rolls, sheet width attenuation may be eliminated, thickness of the beads that form along the edges of the glass sheet may be reduced, and instabilities associated with sheet width variation may be eliminated.
    Type: Grant
    Filed: October 1, 2015
    Date of Patent: August 27, 2019
    Assignee: Corning Incorporated
    Inventors: Olus Naili Boratav, Gaozhu Peng, William Anthony Whedon
  • Patent number: 10377654
    Abstract: A method includes supplying a conjoined molten glass stream to an overflow distributor. A cross section of the conjoined molten glass stream includes a first cross sectional portion and a second cross sectional portion. The first cross sectional portion includes a first glass composition. The second cross sectional portion includes a second glass composition different than the first glass composition. The first glass composition is flowed over a first transverse segment of a weir of the overflow distributor. The second glass composition is flowed over a second transverse segment of the weir of the overflow distributor.
    Type: Grant
    Filed: August 29, 2018
    Date of Patent: August 13, 2019
    Assignee: Corning Incorporated
    Inventor: Steven Howard Tarcza
  • Patent number: 10011511
    Abstract: A glass forming apparatus for processing molten glass is disclosed comprising a delivery vessel for delivery molten glass to a forming body through a delivery conduit, the delivery conduit comprising a first portion have a circular cross-sectional shape, a second portion comprising a circular cross-sectional shape and a third portion comprising a non-circular cross-sectional shape. The delivery conduit further comprises a first transition portion coupling the second portion to the third portion, and a second transition portion coupling the third portion to an inlet of a trough in a forming body. Neither an inside bottom surface of the third portion, nor an inside bottom surface of the second transition portion, is lower than a bottom surface of the forming body trough. A method of processing molten glass is also described.
    Type: Grant
    Filed: August 19, 2014
    Date of Patent: July 3, 2018
    Assignee: Corning Incorporated
    Inventor: John Jerry Kersting
  • Patent number: 9637413
    Abstract: A base material for a disk roll, the base material including: 5 to 9 wt % of ceramic fibers, 20 to 40 wt % of kibushi clay, 2 to 20 wt % of bentonite and 40 to 60 wt % of mica.
    Type: Grant
    Filed: August 7, 2013
    Date of Patent: May 2, 2017
    Assignee: NICHIAS CORPORATION
    Inventors: Kazuhisa Watanabe, Tetsuya Mihara, Taichi Shiratori
  • Patent number: 9382147
    Abstract: In an annealing zone (3) of a glass sheet producing method, a curved portion (5) is formed by curving a glass ribbon (G) in a width direction, and a concavo-convex direction in a front and back direction of the curved portion (5) is reversed at least between an upper side and a lower side of a part of a region in the width direction of the glass ribbon (G). Therefore, a bending resistance in an upper and lower direction of the glass ribbon (G) and a bending resistance in the width direction of the glass ribbon (G) are increased.
    Type: Grant
    Filed: June 18, 2015
    Date of Patent: July 5, 2016
    Assignee: NIPPON ELECTRIC GLASS CO., LTD.
    Inventors: Hidetaka Oda, Noritomo Nishiura, Koki Ueda, Tomonori Kano
  • Patent number: 9336810
    Abstract: A method for manufacturing a glass substrate for magnetic disk is provided in which a glass is kept from being fused to a mold during press forming and shape processing to achieve a good circularity is efficiently performed. The method includes: a forming process of forming a disk-shaped glass blank by direct-pressing a molten glass by a pair of dies; and a shape processing process of performing at least one of inner hole formation and outer shape formation for forming a disk-shaped glass substrate by forming a cutting line on the principal face of the glass blank, followed by growing the cutting line to perform cutting. In the forming process, press forming is performed while the temperature of the pair of dies, over a period of time until a molten glass is separated from the die after coming into contact with the die, is set at a temperature lower than a glass transition point (Tg) and a mold release material is not attached to the surfaces of the pair of dies.
    Type: Grant
    Filed: April 27, 2012
    Date of Patent: May 10, 2016
    Assignee: HOYA CORPORATION
    Inventors: Hideki Isono, Hidekazu Tanino, Akira Murakami, Takashi Sato, Masamune Sato, Masaru Onishi
  • Patent number: 9096459
    Abstract: A flat panel display glass substrate includes a glass comprising, in mol %, 55-80% SiO2, 3-20% Al2O3, 3-15% B2O3, and 3-25% RO (the total amount of MgO, CaO, SrO, and BaO). The contents in mol % of SiO2, Al2O3, and B2O3 satisfy a relationship (SiO2+Al2O3)/(B2O3)=7.5-17. The strain point of the glass is 665° C. or more. The devitrification temperature of the glass is 1250° C. or less. The substrate has a heat shrinkage rate of 75 ppm or less. The rate of heat shrinkage is calculated from the amount of shrinkage of the substrate measured after a heat treatment which is performed at a rising and falling temperature rate of 10° C./min and at 550° C. for 2 hours by the rate of heat shrinkage (ppm)={the amount of shrinkage of the substrate after the heat treatment/the length of the substrate before the heat treatment}×106.
    Type: Grant
    Filed: June 29, 2012
    Date of Patent: August 4, 2015
    Assignee: AvanStrate Inc.
    Inventors: Akihiro Koyama, Satoshi Ami, Manabu Ichikawa
  • Patent number: 9040139
    Abstract: The present invention relates to a process for producing a base material for disks of disk rolls, in which the disk roll contains a rotating shaft and a plurality of the disks fitted on the rotating shaft by insertion whereby the outer peripheral surface of the disks serves as a conveying surface, in which the process contains molding a slurry raw material containing inorganic fibers, an inorganic filler having an aspect ratio of from 1 to 25 and an inorganic binder into a plate shape; and drying the molded plate.
    Type: Grant
    Filed: February 27, 2014
    Date of Patent: May 26, 2015
    Assignee: NICHIAS CORPORATION
    Inventors: Kazuhisa Watanabe, Kouji Iwata, Masaaki Nakayama
  • Patent number: 9029280
    Abstract: A substrate for p-Si TFT flat panel displays made of a glass having a high low-temperature-viscosity characteristic temperature and manufactured while avoiding erosion/wear of a melting tank during melting through direct electrical heating. The glass substrate comprises 52-78 mass % of SiO2, 3-25 mass % of Al2O3, 3-15 mass % of B2O3, 3-20 mass % of RO, wherein RO is total amount of MgO, CaO, SrO, and BaO, 0.01-0.8 mass % of R2O, wherein R2O is total amount of Li2O, Na2O, and K2O, and 0-0.3 mass % of Sb2O3, and substantially does not comprise As2O3, wherein the mass ratio CaO/RO is equal to or greater than 0.65, the mass ratio (SiO2+Al2O3)/B2O3 is in a range of 7-30, and the mass ratio (SiO2+Al2O3)/RO is equal to or greater than 5. A related method involves melting glass raw materials blended to provide the glass composition; a forming step of forming the molten glass into a flat-plate glass; and an annealing step of annealing the flat-plate glass.
    Type: Grant
    Filed: June 29, 2012
    Date of Patent: May 12, 2015
    Assignee: AvanStrate Inc.
    Inventors: Akihiro Koyama, Satoshi Ami, Manabu Ichikawa
  • Patent number: 9016092
    Abstract: A glass for a magnetic recording medium substrate permitting the realization of a magnetic recording medium substrate affording good chemical durability and having an extremely flat surface, a magnetic recording medium substrate comprised of this glass, a magnetic recording medium equipped with this substrate, and methods of manufacturing the same. The glass is an oxide glass not including As or F.
    Type: Grant
    Filed: March 18, 2009
    Date of Patent: April 28, 2015
    Assignee: Hoya Corporation
    Inventors: Yoichi Hachitani, Kinobu Osakabe
  • Patent number: 9003834
    Abstract: The present invention provides a glass substrate for magnetic disk in which surface irregularity of a principal surface is suppressed and a method for efficiently manufacturing a glass substrate for magnetic disk. The method includes the steps of: forming a sheet glass material by performing press forming to molten glass, a principal surface of the sheet glass material having target flatness for the glass substrate for magnetic disk, the sheet glass material having a surface shape to be ground using a grinding abrasive grain; grinding the sheet glass material using a fixed abrasive grain; and polishing the sheet glass material using a loose abrasive grain, the sheet glass material having surface irregularity of the principal surface ground using the fixed abrasive grain.
    Type: Grant
    Filed: December 27, 2010
    Date of Patent: April 14, 2015
    Assignee: Hoya Corporation
    Inventors: Shinji Eda, Hideki Isono
  • Publication number: 20150096330
    Abstract: A glass manufacturing apparatus comprises a forming device configured to produce a glass ribbon and a control device configured to independently operate a first pull roll apparatus, a second pull roll apparatus, and a third pull roll apparatus such that at least one of a first upstream pair of draw rolls rotates with a substantially constant torque, at least one of a first midstream pair of draw rolls rotates with a substantially constant torque, and at least one of a first downstream pair of draw rolls rotates with a substantially constant angular velocity. In further examples, methods of manufacturing a glass ribbon are provided.
    Type: Application
    Filed: October 4, 2013
    Publication date: April 9, 2015
    Applicant: Corning Incorporated
    Inventors: Tomohiro Aburada, Steven Roy Burdette, Masumi Kihata, Chris Scott Kogge, Gautam Narendra Kudva, Michael Yoshiya Nishimoto, Gary Graham Squier, David John Ulrich
  • Patent number: 8973404
    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: Grant
    Filed: March 31, 2011
    Date of Patent: March 10, 2015
    Assignee: Hoya Corporation
    Inventors: Shinji Eda, Hideki Isono
  • Patent number: 8962502
    Abstract: The present invention provides the composition of an alkali-free glass composition containing no alkali metal oxide and the preparation thereof. The alkali-free glass comprising substantially no alkali metal oxide according to the present invention comprises 61 to 73 wt % of SiO2; 0.5 to 3.9 wt % of B2O3; 3.5 to 13.5 wt % of Al2O3; 9 to 13 wt % of MgO; 1 to 8 wt % of CaO; and 4 to 10 wt % of SrO, based on the total weight of oxides present therein.
    Type: Grant
    Filed: October 16, 2013
    Date of Patent: February 24, 2015
    Assignee: LG Chem, Ltd.
    Inventors: Sang-Kook Kim, Won-Bae Lim, Du-Sun Hwang, Dong-Kwon Lee, Su-Hwan Kim, Da-Jeong Kim
  • Publication number: 20150051060
    Abstract: Alkali-doped boroaluminosilicate glasses are provided. The glasses include the network formers SiO2, B2O3, and Al2O3. The glass may, in some embodiments, have a Young's modulus of less than about 65 GPa and/or a coefficient of thermal expansion of less than about 40×10?7/° C. The glass may be used as a cover glass for electronic devices, a color filter substrate, a thin film transistor substrate, or an outer clad layer for a glass laminate.
    Type: Application
    Filed: August 8, 2014
    Publication date: February 19, 2015
    Inventors: Adam James Ellison, Jason Sanger Frackenpohl, John Christopher Mauro, Douglas Miles Noni, JR., Natesan Venkataraman
  • Publication number: 20150045202
    Abstract: To provide glass having a favorable color tone, and its production process. Glass comprising, as represented by mass percentage based on oxides, at least 60% and at most 75% of SiO2, at least 8% and at most 20% of Na2O, at least 4.5% of MgO, at least 1% and at most 10% of CaO, and at least 0.01% and at most 0.5% of Er2O3.
    Type: Application
    Filed: October 27, 2014
    Publication date: February 12, 2015
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Yuki KONDO, Yuya Shimada, Hiroyuki Hijiya
  • Patent number: 8938992
    Abstract: A method of manufacturing a glass sheet according to the present invention comprises the steps of creating split flows of molten glass in a forming body 10 and causing the molten glass to flow down, subsequently merging the flows at a merging point to form a glass sheet G and causing the glass sheet to flow downward in the vertical direction. In this method of manufacturing a glass sheet, a partition member 20 is disposed facing the glass sheet G in the vicinity of a location below the forming body 10, and a facing surface of the partition member 20 is shaped so as to correspond to a sheet thickness variation of the glass sheet G, so that a gap between the glass sheet G and the partition member 20 is substantially uniform.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: January 27, 2015
    Assignee: AvanStrate Inc.
    Inventors: Hiroyuki Kariya, Takayuki Shimizu, Mikio Kimori
  • Publication number: 20150008378
    Abstract: To provide a colored glass plate which, despite the content of expensive cerium controlled to be low, simultaneously satisfies low solar transmittance, high visible light transmittance and low UV transmittance, while transmitted light has a green color tone. The colored glass plate comprises, as represented by mass percentage based on oxides, SiO2: from 65 to 75%, Al2O3: from 0 to 6%, MgO: from 0 to 6%, CaO: from 5 to 15%, total iron calculated as Fe2O3: from 0.3 to 1.2%, total titanium calculated as TiO2: from 0.2 to 1.1%, total vanadium calculated as V2O5: from 0.02 to 0.3%, and total cerium calculated as CeO2: from 0.01 to 0.5%, and contains substantially no cobalt, chromium or manganese.
    Type: Application
    Filed: July 28, 2014
    Publication date: January 8, 2015
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Yuya SHIMADA, Yuki Kondo, Tomoyuki Kobayashi
  • Patent number: 8921245
    Abstract: The present invention provides a glass substrate having high glass transition temperature and small compaction (C) in a heat treatment at a low temperature (150 to 300° C.), the glass substrate including SiO2, Al2O3, B2O3, MgO, CaO, SrO, BaO, ZrO2, Na2O, K2O, and Li2O, wherein each amount of these compounds is specifically limited, Al2O3+K2O is 7 to 27 mass %, Na2O+K2O is 11.5 to 22 mass %, MgO+CaO+SrO+BaO is 0.2 to 14 mass %, MgO+0.357Al2O3?0.239K2O?5.58 is ?3.0 to 1.5, Na2O+0.272Al2O3+0.876K2O?16.77 is ?2.5 to 2.5, a glass transition temperature is 500° C. or higher, and an average thermal expansion coefficient at 50 to 350° C. is 100×10?7/° C. or less.
    Type: Grant
    Filed: December 3, 2012
    Date of Patent: December 30, 2014
    Assignee: Asahi Glass Company, Limited
    Inventor: Manabu Nishizawa
  • Publication number: 20140356608
    Abstract: A method for producing bubble-free glasses is provided, in which a glass mixture that is arsenic-free and antimony-free with the exception of any unavoidable raw material impurities and a sulfate compound and SnO2 as refining agents are used. The glass mixture is melted and primarily refined in a first region of a melting tank, an average melting temperature (T1) is set at T1>1560° C. and an average melt residence time (t1) is set at t1>2 hours. The proportion of SO3 resulting from the decomposition of the sulfate compound is reduced to less than 0.002 wt. % as the primary refinement is carried out. A secondary refinement is carried out in a second region of the melting tank, an average melting temperature (T2) is set at T2>1640° C. and an average melt residence time (t2) is set at t2>1 hour.
    Type: Application
    Filed: August 19, 2014
    Publication date: December 4, 2014
    Inventors: Frank-Thomas LENTES, Karin NAUMANN, Ulrich SCHIFFNER, Friedrich SIEBERS, Christian MUELLER, Klaus SCHOENBERGER, Evelin WEISS
  • Publication number: 20140352356
    Abstract: Methods of forming a glass ribbon with a glass forming apparatus including a first glass roll device are disclosed. The methods include a step (I) of drawing the glass ribbon along a draw direction with the glass forming apparatus. Also included is a step (II) of adjusting a first roll member relative to a first support structure of the first glass roll device by translating the first roll member in a first linear direction parallel to a linear adjustment axis of the first support structure while the first roll member is adjustably mounted to the first support structure. Also included is a step (III) of contacting a first surface of the glass ribbon with the first roll member at a first adjusted contact location of the glass ribbon. Also disclosed are corresponding glass forming apparatus configured to form glass ribbons and draw the glass ribbons in a draw direction.
    Type: Application
    Filed: May 22, 2014
    Publication date: December 4, 2014
    Applicant: Corning Incorporated
    Inventors: James Gary Anderson, Lewis Kirk Klingensmith
  • Patent number: 8895462
    Abstract: The present invention provides the composition of an alkali-free glass composition containing no alkali metal oxide and the preparation thereof. The alkali-free glass comprising substantially no alkali metal oxide according to the present invention comprises 46 to 57 wt % of SiO2; 3.5 to 7.5 wt % of B2O3; 21 to 29 wt % of Al2O3; 3 to 14 wt % of MgO; 11 to 16 wt % of CaO; and 1 to 5 wt % of SrO, based on the total weight of oxides present therein.
    Type: Grant
    Filed: September 4, 2013
    Date of Patent: November 25, 2014
    Assignee: LG Chem, Ltd.
    Inventors: Dong-Kwon Lee, Jung-Sik Bang, Sang-Kook Kim, Won-Bae Lim, Su-Hwan Kim, Da-Jeong Kim
  • Patent number: 8887529
    Abstract: A process and apparatus for cutting a continuous glass ribbon involving the use of edge restrainers such as suction cups and clamps connected to an actuator of a robot tooling through a flexible linkage capable of reciprocal motion in the direction of the ribbon velocity. The use of the flexible linkage reduces peak pulling-force when the glass ribbon is pulled or pushed laterally to during bending and separation along a pre-formed score-line. The invention can be advantageously used in the bottom of the draw of a vertical down-draw forming process.
    Type: Grant
    Filed: October 26, 2011
    Date of Patent: November 18, 2014
    Assignee: Corning Incorporated
    Inventors: Hung Cheng (Henry) Lu, Wei Xu, Liming Wang, Naiyue Zhou
  • Patent number: 8887530
    Abstract: Disclosed are methods for compensating the varying weight of a glass ribbon the glass ribbon is drawn from a molten glass forming material, and an apparatus therefore. The weight compensating apparatus is configured to apply a force to the glass ribbon that is inversely proportional to the weight of the glass ribbon such that as the glass ribbon weight increases, the force applied to the glass ribbon by the weight compensating device decreases.
    Type: Grant
    Filed: June 20, 2014
    Date of Patent: November 18, 2014
    Assignee: Corning Incorporated
    Inventors: Shawn Rachelle Markham, Jae Hyun Yu
  • Publication number: 20140335331
    Abstract: Alkali-free phosphoboroaluminosilicate glasses are provided. The glasses include the network formers SiO2, B2O3, and at least one of Al2O3 and P2O5. The glass may, in some embodiments, have a Young's modulus of less than about 78 GPa and/or a coefficient of thermal expansion, averaged over a temperature range from about 20° C. to about 300° C., of less than about 38×10?7/° C. The glass may be used as a cover glass for electronic devices or as an outer clad layer for a glass laminate.
    Type: Application
    Filed: May 1, 2014
    Publication date: November 13, 2014
    Applicant: Corning Incorporated
    Inventors: Adam James Ellison, John Christopher Mauro, Natesan Venkataraman
  • Patent number: 8883665
    Abstract: The present invention provides the composition of an alkali-free glass composition containing no alkali metal oxide and the preparation thereof. The alkali-free glass comprising substantially no alkali metal oxide according to the present invention comprises 60 to 70 wt % of SiO2; 1 to 3.5 wt % of B2O3; 1 to 13 wt % of Al2O3; 8.5 to 14 wt % of MgO; 1 to 3 wt % of CaO; 4 to 7 wt % of SrO; and 0.5 to 7 wt % of BaO, based on the total weight of oxides present therein.
    Type: Grant
    Filed: August 29, 2013
    Date of Patent: November 11, 2014
    Assignee: LG Chem, Ltd.
    Inventors: Dong-Kwon Lee, Sang-Kook Kim, In-Ki Hong, Jung-Min Ko, Sang-Hyeok Im
  • Patent number: 8869559
    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: Grant
    Filed: January 31, 2012
    Date of Patent: October 28, 2014
    Assignee: Hoya Corporation
    Inventors: Hideki Isono, Shinji Eda
  • Patent number: 8871663
    Abstract: The present invention provides the composition of an alkali-free glass composition containing no alkali metal oxide and the preparation thereof. The alkali-free glass comprising substantially no alkali metal oxide according to the present invention comprises 68 to 75 wt % of SiO2; 1 to 3 wt % of B2O3; 4 to 13 wt % of Al2O3; 1 to 6 wt % of MgO; 1 to 11 wt % of CaO; 4 to 9 wt % of SrO; and 3 to 7 wt % of BaO, based on the total weight of oxides present therein.
    Type: Grant
    Filed: February 20, 2014
    Date of Patent: October 28, 2014
    Assignee: LG Chem, Ltd.
    Inventors: Dong-Kwon Lee, Duk-Sik Ha, Han-Kook Kim, Won-Bae Lim, Du-Sun Hwang, Sang-Kook Kim
  • Patent number: 8844320
    Abstract: A manufacturing method of a sheet glass material for magnetic disk, the method includes, dropping process for dropping a lump of molten glass; pressing process for sandwiching simultaneously the lump from both sides of the dropping path of the lump with surfaces of a pair of dies facing together, and performing press forming to the lump to obtain a sheet glass material, wherein at least one of the pair of dies has a concave shape with respect to the dropping path of the lump.
    Type: Grant
    Filed: March 30, 2012
    Date of Patent: September 30, 2014
    Assignee: Hoya Corporation
    Inventors: Hideki Isono, Hidekazu Tanino
  • Publication number: 20140283553
    Abstract: Method of manufacturing cover glass plate includes drop step, press step and processing step. In the drop step, molten glass is dropped onto lower mold. In the press step, the molten glass on the lower mold is pressed with upper mold having concave portion so as to fill the concave portion of the upper mold with the molten glass and furthermore, the concave portion is overlapped to area between the upper mold and the lower mold so as to form preform formed with molded main body having first surface to which the shape of the concave portion of the upper mold is transferred and overlap portion having second surface which is portion other than the molded main body and to which the shape of the lower mold is transferred. In the processing step, all the overlap portion is removed from the preform.
    Type: Application
    Filed: September 21, 2012
    Publication date: September 25, 2014
    Applicant: KONICA MINOLTA, INC.
    Inventor: Toshiya Tomisaka
  • Publication number: 20140283554
    Abstract: A glass manufacturing system and method are described herein for forming a high quality thin glass sheet. In one embodiment, the glass manufacturing system and method use at least one of a compensated rolling roll, a temperature controlled environment and edge rolls to form a high quality thin glass sheet that has a thickness less than about 2 mm and more preferably less than about 100 ?m.
    Type: Application
    Filed: June 4, 2014
    Publication date: September 25, 2014
    Inventor: Allan Mark Fredholm
  • Patent number: 8826694
    Abstract: A method of manufacturing a glass sheet includes creating split flows of molten glass in a forming body (10) and causing the molten glass to flow down, subsequently merging the flows at a merging point to form a glass sheet G and causing the glass sheet to flow downward in the vertical direction. A plurality of chambers (42b, 42c, . . . ) separated by heat-insulating plates (40a, 40b, . . . ) in the direction of movement of the glass sheet G are provided. A heater (60a, 60b, . . . ) is provided for each of the chambers (42b, 42c, . . . ) so that the temperature decreases in the direction of movement. The heat-insulating plates (40a, 40b, . . . ) are disposed facing the glass sheet G, and facing surfaces of the heat-insulating plates (40a, 40b, . . . ) are shaped so as to correspond to a sheet thickness variation of the glass sheet G.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: September 9, 2014
    Assignee: AvanStrate Inc.
    Inventors: Hiroyuki Kariya, Nobuhiro Maeda
  • Patent number: 8820118
    Abstract: Apparatus for producing glass ribbon includes a control device configured at least periodic thermal stress compensation of the glass ribbon by independently adjusting operation of a plurality of temperature adjustment elements based on stress characteristic information at least periodically obtained from a stress sensor apparatus. In further examples, methods of producing glass include at least periodically sensing a stress characteristic of a glass ribbon and at least periodically changing a transverse temperature profile of the glass ribbon based stress characteristic information. In further examples, methods include the step of changing a transverse temperature profile of the glass ribbon only if a measured parameter is within an operating range associated with the parameter.
    Type: Grant
    Filed: May 14, 2013
    Date of Patent: September 2, 2014
    Assignee: Corning Incorporated
    Inventors: Jeffrey Howard Ahrens, Terry Jay Ott
  • Publication number: 20140243186
    Abstract: Described herein are alkali-free, boroalumino silicate glasses exhibiting desirable physical and chemical properties for use as substrates in flat panel display devices, such as, active matrix liquid crystal displays (AMLCDs). In accordance with certain of its aspects, the glasses possess good dimensional stability as a function of temperature.
    Type: Application
    Filed: May 6, 2014
    Publication date: August 28, 2014
    Applicant: Corning Incorporated
    Inventors: Paul Stephen Danielson, Adam James Ellison, Natesan Venkataraman
  • Publication number: 20140238077
    Abstract: Repositionable heater assemblies and methods of controlling temperature of glass in production lines using the repositionable heater assemblies are disclosed. The repositionable heater assembly includes a support frame, a first sled and a second sled each coupled to the support frame with bearing members that allow the first sled and the second sled to translate in a longitudinal direction. Each of the first sled and the second sled include at least one heating element, where the heating elements are spaced apart from the glass ribbon a spacing distance. The first and second sleds are movable in the longitudinal direction to controlling the spacing distance between the heating elements of the first sled and the second sled and the glass ribbon to manage temperature of the glass ribbon.
    Type: Application
    Filed: February 25, 2013
    Publication date: August 28, 2014
    Applicant: Corning Incorporated
    Inventors: James Gary Anderson, Steven Roy Burdette, Vladislav Yuryevich Golyatin, Jon Anthony Passmore, George Clinton Shay
  • Publication number: 20140230492
    Abstract: A tempered glass of the present invention includes, as a glass composition, in terms of mass %, 45 to 75% of SiO2, 0 to 30% of Al2O3, and 0 to 30% of Li2O+Na2O+K2O and has a ?—OH value of 0.3 to 1/mm.
    Type: Application
    Filed: April 30, 2014
    Publication date: August 21, 2014
    Applicant: Nippon Electric Glass Co., Ltd.
    Inventor: Takashi MURATA
  • Patent number: 8806894
    Abstract: A manufacturing method for a glass roll includes forming a glass film by a downdraw method, winding the glass film into a roll using a winding roller in a state in which front and back glass surfaces of the glass film formed in said forming operation are exposed, and during said winding operation, superposing the glass film on a separable protective sheet. The protective sheet extends beyond both sides in a width direction of the glass film. The method may further include winding the protective sheet on an outer peripheral surface of the glass film by winding only the protective sheet from a trailing end of the glass film in a winding direction of the glass film.
    Type: Grant
    Filed: September 30, 2009
    Date of Patent: August 19, 2014
    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
  • Publication number: 20140223964
    Abstract: The present invention provides a method for efficiently manufacturing a glass substrate for magnetic disk having good accuracy of a surface irregularity and an impact resistance. The method includes the steps of: performing press forming to molten glass to prepare a sheet glass material, the sheet glass material having a roughness of the principal surface of 0.01 ?m or less and target flatness of a glass substrate for magnetic disk; chemically strengthening the sheet glass material by dipping the sheet glass material in a chemically strengthening salt, thereby preparing a disk substrate; polishing the principal surfaces of the disk substrate. A thickness of the sheet glass material prepared in the press forming step is larger than a target thickness of the glass substrate for magnetic disk by a polishing quantity of the principal surface polishing step.
    Type: Application
    Filed: April 17, 2014
    Publication date: August 14, 2014
    Applicant: HOYA CORPORATION
    Inventors: Shinji EDA, Hideki ISONO
  • Patent number: 8800320
    Abstract: A manufacturing method of a sheet glass material for magnetic disk, the method includes, dropping process for dropping a lump of molten glass; pressing process for sandwiching simultaneously the lump from both sides of the dropping path of the lump with surfaces of a pair of dies facing together, and performing press forming to the lump to obtain a sheet glass material, wherein at least one of the pair of dies has a convex shape with respect to the dropping path of the lump.
    Type: Grant
    Filed: March 30, 2012
    Date of Patent: August 12, 2014
    Assignee: Hoya Corporation
    Inventors: Hideki Isono, Hidekazu Tanino
  • Patent number: 8791036
    Abstract: The present invention relates to a glass plate for a substrate contains, as a glass matrix composition, in mol % on the oxide basis, SiO2: 67 to 72, Al2O3: 1 to 7, B2O3: 0 to 4, MgO: 11 to 15, CaO: 0 to 3, SrO: 0 to 3, BaO: 0 to 4, ZrO2: 0 to 4, Na2O: 8 to 15, and K2O: 0 to 7, with SiO2+Al2O3: 71 to 77, MgO+CaO+SrO+BaO: 11 to 17, Na2O+K2O: 8 to 17, and satisfying K2O/(Na2O+K2O)?0.13×(SiO2+Al2O3+0.5B2O3+0.3BaO)?9.4, in which the glass plate has a ?-OH value (mm?1) of 0.05 to 0.5, and a heat shrinkage ratio (C) of 16 ppm or less.
    Type: Grant
    Filed: March 30, 2012
    Date of Patent: July 29, 2014
    Assignee: Asahi Glass Company, Limited
    Inventors: Tomoyuki Tsujimura, Yuichi Kuroki, Manabu Nishizawa
  • Patent number: 8769989
    Abstract: A cleaving apparatus holds at least one surface (effective surface) of a band-like glass film in a non-contact state to suppress a situation that wavy portions reach a region in which the band-like glass film is to be cleaved. The cleaving apparatus cleaves the band-like glass film, which is being conveyed in a longitudinal direction thereof, along a conveyance direction thereof using a thermal stress generated through localized heating and cooling of a heated region. The localized heating and the cooling is performed on a preset cleaving line extending along the conveyance direction of the band-like glass film. The cleaving apparatus includes an air knife for supplying air to a front surface of the band-like glass film to retain the film on a conveyor at a position on an upstream side of a cleaving region in the conveyance direction.
    Type: Grant
    Filed: November 15, 2011
    Date of Patent: July 8, 2014
    Assignee: Nippon Electric Glass Co., Ltd.
    Inventors: Kaoru Mitsugi, Naohiro Ikai, Hiroshi Adachi, Hiroki Mori
  • Patent number: 8763429
    Abstract: Described herein are alkali-free, boroalumino silicate glasses exhibiting desirable physical and chemical properties for use as substrates in flat panel display devices, such as, active matrix liquid crystal displays (AMLCDs). In accordance with certain of its aspects, the glasses possess good dimensional stability as a function of temperature.
    Type: Grant
    Filed: November 10, 2010
    Date of Patent: July 1, 2014
    Assignee: Corning Incorporated
    Inventors: Paul S. Danielson, Adam J. G. Ellison, Natesan Venkataraman
  • Patent number: 8746010
    Abstract: Methods are disclosed for treating zircon-containing forming structures, e.g., zircon isopipes, with one or more treatment glass compositions in which defect-causing reactions between the zircon of the forming structure and molten glass are suppressed at the delivery temperature of the treatment glass. The treatment compositions can be used during start-up of a forming structure, between runs of the same production glass on a given forming structure, and/or when transitioning between runs of two production glasses on a given forming structure. The treatment compositions can be used with production glasses that are ion-exchangeable.
    Type: Grant
    Filed: March 12, 2012
    Date of Patent: June 10, 2014
    Assignee: Corning Incorporated
    Inventors: Adam J. Ellison, Timothy J. Kiczenski, John C. Mauro
  • Patent number: 8741794
    Abstract: A glass substrate for a display, which is formed of a glass having a light weight and having high refinability with decreasing environmental burdens, the glass comprising, by mass %, 50 to 70% of SiO2, 5 to 18% of B2O3, 10 to 25% of Al2O3, 0 to 10% of MgO, 0 to 20% of CaO, 0 to 20% of SrO, 0 to 10% of BaO, 5 to 20% of RO (in which R is at least one member selected from the group consisting of Mg, Ca, Sr and Ba), and over 0.20% but not more than 2.0% of R?2O (in which R? is at least one member selected from the group consisting of Li, Na and K), and containing, by mass %, 0.05 to 1.5% of oxide of metal that changes in valence number in a molten glass, and substantially containing none of As2O3, Sb2O3 and PbO.
    Type: Grant
    Filed: January 18, 2013
    Date of Patent: June 3, 2014
    Assignee: Avanstrate Inc.
    Inventors: Junji Kurachi, Akihiro Koyama, Yoichi Hachitani
  • Publication number: 20140144181
    Abstract: An apparatus (10) for forming sheet glass (78) includes a pair of rollers (12a, 12b) arranged in opposing relation to form a nip gap (38). At least one of the rollers (12a, 12b) is translatable to adjust a width (39) of the nip gap (38). A pair of spacer belts (34, 36) passes in between the pair of rollers (12a, 12b). The spacer belts (34, 36) are spaced apart along a length of the pair of rollers (12a, 12b) and have a thickness to set the width (39) of the nip gap (38). At least one actuator (42a, 42b) is coupled to at least one of the rollers (12a, 12b) and operable to adjust a width (39) of the nip gap (38) until the pair of spacer belts (34, 36) is gripped by the pair of rollers (12a, 12b) and the thickness of the pair of spacer belts (34, 36) sets the width (39) of the nip gap (38).
    Type: Application
    Filed: November 26, 2013
    Publication date: May 29, 2014
    Applicant: Corning Incorporated
    Inventor: Stephane Poissy
  • Patent number: 8733130
    Abstract: A process for coating a ribbon of float glass is disclosed. It comprises the steps of forming a glass ribbon, depositing a first transparent conductive coating upon a major surface of the ribbon which does not extend to the edges of the ribbon while the ribbon is at an elevated temperature, cooling said coated ribbon under controlled conditions in an annealing lehr and cutting off the edges of the ribbon so as to produce a ribbon having a uniform coating extending across the full width of the cut ribbon which is characterized in that a second conductive coating is deposited upon the uncoated edges of the ribbon while that edge is at a temperature which is above the ambient temperature. The invention finds particular application in the production of coated glass products where the thickness of the glass ribbon is at least 8 mm and most particularly where the thickness of the glass is at least 10 mm.
    Type: Grant
    Filed: May 7, 2009
    Date of Patent: May 27, 2014
    Assignee: Pilkington Group Limited
    Inventors: Kevin Sanderson, Gerhard Lingl, Hans-Eckhard Leitl, Franz Michael Josef Scharnagl, Douglas M Nelson
  • Patent number: 8726695
    Abstract: A manufacturing apparatus for a thin glass sheet includes a forming member main body configured to form the thin glass sheet by fusing together, at a lower end portion of the forming member main body, streams of molten glass, which have overflown from an overflow trough to both sides of the forming member main body, under a state in which the streams of the molten glass are caused to flow down along outer surface portions having a substantially wedge shape. The manufacturing apparatus also includes a pair of covering members fitted onto both widthwise end portions of the forming member main body, respectively, the pair of covering members forming restricting wall portions for restricting widthwise spread of the streams of the molten glass flowing down along the outer surface portions of the forming member main body.
    Type: Grant
    Filed: March 26, 2012
    Date of Patent: May 20, 2014
    Assignee: Nippon Electric Glass Co., Ltd.
    Inventors: Tomonori Kano, Noritomo Nishiura, Koki Ueda, Takahide Nakamura, Daisuke Nagata, Hidetaka Oda, Yuji Iwama
  • Publication number: 20140130551
    Abstract: In one embodiment, a pulling roll for drawing glass sheet in a down-draw process includes a shaft member and a compliant cover assembly positioned on the shaft member. The compliant cover assembly includes at least one traction disk and at least one deflection limiting disk positioned on the shaft member. The at least one traction disk includes an annular hub and a plurality of spring elements integrally formed with the annular hub. The at least one deflection limiting disk includes at least one deflection limiting element positioned on each deflection limiting disk. The at least one deflection limiting element engages at least a portion of at least one traction disk upon a predetermined amount of inward radial deflection of the plurality of spring elements, thereby limiting the inward radial deflection of the plurality of spring elements.
    Type: Application
    Filed: November 13, 2012
    Publication date: May 15, 2014
    Inventors: Michael Thomas Gallagher, George Clinton Shay, Izhar Zahoor Ahmed, Nicholas Ryan Wheeler, Ralph Alfred Langensiepen
  • Publication number: 20140130550
    Abstract: In one embodiment, a pulling roll for drawing glass sheet in a down-draw process includes a shaft member and a compliant cover assembly positioned on the shaft member. The compliant cover assembly includes at least one traction disk positioned on the shaft member. The at least one traction disk includes an annular hub and a plurality of spring elements integrally formed with the annular hub. The spring elements project outward from the annular hub such that an end of each spring element is positioned radially outward from a base of each spring element and is circumferentially offset relative to the base of each spring element.
    Type: Application
    Filed: November 13, 2012
    Publication date: May 15, 2014
    Inventors: Izhar Zahoor Ahmed, Glen Bennett Cook, Christopher William Drewnowski, Michael Thomas Gallagher, Ralph Alfred Langensiepen, George Clinton Shay
  • Patent number: 8720227
    Abstract: In a glass-ribbon conveyance assisting device which is applied to a glass-ribbon conveyance device configured to convey a glass ribbon on a plurality of rotating glass-conveyance rolls, the glass-ribbon conveyance assisting device includes a rotary drive section, a plurality of rolls configured to be rotated by the rotary drive section, an annular belt configured to rotate while running with flexion under a state where the rolls have been inserted into the belt, and a wheel configured to press the glass ribbon which is conveyed on the belt. The glass ribbon is conveyed on the belt by a drive of the belt under a state where width-directional both end portions of the glass ribbon are sandwiched between the belt and the wheel.
    Type: Grant
    Filed: October 16, 2008
    Date of Patent: May 13, 2014
    Assignee: Central Glass Company, Limited
    Inventors: Tomokazu Tsuji, Takanori Mifuji, Nobuhisa Tanise, Kinji Masui