Tempering Patents (Class 65/114)
  • Patent number: 6131412
    Abstract: A method and equipment for adjusting the temperature of glass sheets in a tempering furnace. The tempering furnace (1) comprises rollers (3) for conveying and oscillating the glass sheets (4) during heating, and resistors (5, 6) for heating the glass sheets (4) from above and from below. The temperature of the glass sheets (4) is measured inside the tempering furnace (1) during heating and the dwell time of the glass sheets (4) in the furnace is adjusted based on the temperature measurements. This enables exact control of the final temperature of the glass from the beginning, and the temperature can be kept uniform independently of the measures taken by the operator.
    Type: Grant
    Filed: March 12, 1999
    Date of Patent: October 17, 2000
    Assignee: Uniglass Engineering Oy
    Inventor: Jukka Vehmas
  • Patent number: 6094943
    Abstract: A toughened glass sheet for use as a windowpane of an automotive vehicle. The toughened glass sheet has a thickness ranging from 2.5 mm to 3.1 mm and has a first characteristic that a number of fragments is not less than 40 within an area of 50 mm.times.50 mm in a fragmentation test in which an impact is applied to a predetermined position of the glass sheet with a hammer or a punch, and a second characteristic that a specified height is not less than 2 m in an impact resistance test in which the specified height is a value at which the glass sheet is broken upon dropping a steel ball having a weight of 227 g.
    Type: Grant
    Filed: June 25, 1998
    Date of Patent: August 1, 2000
    Assignee: Central Glass Company, Limited
    Inventors: Katsuji Okuda, Shinichi Kita, Masahide Ishibashi
  • Patent number: 6067820
    Abstract: The invention relates to a process for the heat-soak treatment of tempered glass panels. After tempering, the glass is heated or cooling of the glass is stopped for maintaining the temperature for the duration of e.g. a good minute within the range of 340-370.degree. C., such that the glasses, which break spontaneously in time as a result of NiS-stones, can be broken already in a so-called heat-soak treatment. During the heating sequence or the cooling stop sequence and during the subsequent cooling sequence, the glass panel is carried in a horizontal plane, e.g. back and forth on rollers in an oscillating fashion. The process is a continuous-action process and the apparatus for implementing the same can be hooked up with a tempering machine for an on-line operation.
    Type: Grant
    Filed: April 21, 1998
    Date of Patent: May 30, 2000
    Assignee: Tamglass Ltd. Oy
    Inventors: Kai Silander, Esko Lehto
  • Patent number: 6064040
    Abstract: The invention relates to a method and apparatus for the localization or focusing of heating in a tempering furnace for glass panels. Glass panels are carried and supported in a furnace (2) by rollers (11). The furnace is provided with upper and lower nozzle boxes (4, 14), including nozzle heads (5, 15) for blasting hot convection air to heat the glass panels to a tempering temperature. The arrival of a load in the furnace is preceded by reading a load picture and by controlling radiation heat resistances (10) present in the furnace in such a way that radiation heating can be focused on the central areas of critical glass panels to provide extra heating therefor.
    Type: Grant
    Filed: February 18, 1999
    Date of Patent: May 16, 2000
    Assignee: Tamglass LTD Oy
    Inventors: Didier Muller, Olivier Muller, Volker Thiessen
  • Patent number: 6053011
    Abstract: A system for tempering glass plates has preheating zone (1) in which several glass plates (7) stacked vertically in compartmented car (6) are heated together to a temperature below the tempering temperature of for example 650.degree. C. (for example 300.degree. C.). Preheated glass plates (7) are moved individually from preheating zone (1) into heating zone (2). In heating zone (2) glass plates (7) are heated to the tempering temperature, their being inclined to the vertical at an acute angle and being held by air cushions between two heating plates. On the lower edge of the two heating plates of heating zone (2) there is transport device which supports glass plates (7) simultaneously to the bottom. Glass plates (7) heated to the tempering temperature are moved into cooling zone (3) which has cooling plates aligned parallel to the heating plates and between which glass plate (7) is pushed for quenching.
    Type: Grant
    Filed: January 26, 1998
    Date of Patent: April 25, 2000
    Inventor: Peter Lisec
  • Patent number: 6032489
    Abstract: A gas is supplied to the surface of the glass sheet transferred between a heating furnace and a cooling apparatus for tempering the glass sheet. The gas is supplied from the upstream side with respect to the direction of transfer of the glass sheet by an air curtain device. This gas runs along the glass sheet surface (upper surface) downstream with respect to the direction of transfer to obstruct the flow of cooling gas from the cooling apparatus in the upstream direction. The gas prevents cooling air from the cooling apparatus from invading the heating furnace so that the difference of the curvature of the glass sheet on the front and rear part can be eliminated.
    Type: Grant
    Filed: June 2, 1998
    Date of Patent: March 7, 2000
    Assignee: Nippon Sheet Glass Co., Ltd.
    Inventors: Hideo Yoshizawa, Toru Futagami, Norihiro Fujioka
  • Patent number: 5992180
    Abstract: A glass plate is heated in a heating furnace and is bend-shaped to be a complexly curved glass plate while the glass plate is passed on curved rollers wherein support pads of a pushing mechanism push the complexly curved glass plate from an upstream side to a downstream side of a transferring device in a state that a rear edge of the complexly curved glass plate is supported by the support pads whereby the complexly curved glass plate is delivered to a cooling device side while a turning movement of the complexly curved glass plate is controlled during the transfer.
    Type: Grant
    Filed: August 5, 1998
    Date of Patent: November 30, 1999
    Assignee: Asahi Glass Company Ltd.
    Inventors: Masahiro Tsuchiya, Tsuyoshi Kawaguchi, Ken Nomura, Kohei Yoshino
  • Patent number: 5983671
    Abstract: An apparatus and method for the preferably continuous manufacture of foamed material using a furnace are provided. A two-part mold mechanism is provided that includes an upper portion and a lower portion that are each endless loops and cooperate with one another to form a closed mold within the furnace. The upper and lower portions can each comprise a plurality of transverse mold members that can be easily replaced or exchanged during operation of the apparatus. A feed mechanism is provided for introducing material that is to be foamed to the mold mechanism upstream of the furnace. Scrapers or the like can be provided downstream of the furnace to aid in separating and supporting foamed material from the mold mechanism.
    Type: Grant
    Filed: February 7, 1997
    Date of Patent: November 16, 1999
    Assignee: Andrew Ungerleider
    Inventors: Steven C. Haines, Tai B. Bixby, Ronald D. Argent, Christopher J. Hoyle, David E. Wiltrout
  • Patent number: 5974834
    Abstract: For a method for bending and tempering glass which has an opening, the glass is bent in the horizontal position using a bending frame (9) and is tempered on the bending frame (9). The bending frame in respect of its contour and of its geometric shape corresponds to the desired shape of the bent glass. During the bending operation and during the tempering operation the glass is supported, in the region around the edge of the opening, by an additional internal bending frame (12).
    Type: Grant
    Filed: December 22, 1997
    Date of Patent: November 2, 1999
    Assignee: Saint-Gobain Vitrage
    Inventors: Ludwic Johan Rijkens, Hans Josef Thevissen, Franz Stiel, Juergen Schmitz, Alwin Timmermann
  • Patent number: 5970745
    Abstract: The invention relates to a method for stopping a glass panel conveyed from a furnace into a tempering station or a bending and tempering station. In the method, a glass panel is carried upon rolls and pressed by means of overhead press rollers, as the conveying speed of the rollers is decelerated for stopping the glass panel. Over a deceleration distance, the rate of deceleration is within the range of 0.6-3 m/s.sup.2. By virtue of the overhead press rollers, the rate of deceleration can be increased, such that the glass exit speed from a furnace can be raised and, at the same time, the glass cooling time can be minimized prior to a tempering process.
    Type: Grant
    Filed: June 2, 1998
    Date of Patent: October 26, 1999
    Assignee: Tamglass Ltd. Oy
    Inventor: Esko Lehto
  • Patent number: 5968220
    Abstract: A process and apparatus (26) for quenching a heated glass sheet by directing modulated cryogenic flows (36) that is initially completely liquid (42) toward the oppositely facing surfaces (38) of the glass sheet to quench the glass sheet. The modulated cryogenic flows (36) can be started and fully stopped to provide flow pulses and can also be continuous and have periodic increased flow pulses.
    Type: Grant
    Filed: July 31, 1998
    Date of Patent: October 19, 1999
    Assignee: Glasstech, Inc.
    Inventors: Ronald A. McMaster, Kenneth R. Kormanyos
  • Patent number: 5959005
    Abstract: Silica with the following physico-chemical properties:______________________________________ Specific surface m.sup.2 /g 80-400 Primary particle size nm 7-40 Tapped density g/l 50-300 pH value 3-10 Carbon content % 0.1-15 DBP number % <200 ______________________________________is produced by spraying a silica under intensive mixing, optionally with water or dilute acid at first and then with a surface-modifying reagent or a mixture of several surface-modifying reagents, then mixing, tempering, and subsequently destructuring/compressing and grinding.
    Type: Grant
    Filed: April 14, 1997
    Date of Patent: September 28, 1999
    Assignee: Degussa-Huls Aktiengesellschaft
    Inventors: Werner Hartmann, Juergen Meyer, Hauke Jacobsen, Thomas Hennig, Henning Karbe, Uwe Schachtely
  • Patent number: 5939175
    Abstract: Diclosed is a plate glass wherein surfaces (3a) of plate glass (3) are formed flat and finished with a maximum surface ruggedness not exceeding 0.05 mm, and boundaries (3c) between end surfaces (3a) and front and back surfaces (3b) of the plate glass (3) are finished with a maximum surface ruggedness not exceeding 0.007 mm. Thus, though the plate glass is treated with heat reinforcement by the method simpler and more convenient than the prior art, the plate glass maintains performance as fire glass. It is now possible to provide quality improvement as plate glass, a reduction in running cost of heat reinforcing treatment equipment, and a reduction in working stress due to the weight of the plate glass itself in time of fitting the plate glass.
    Type: Grant
    Filed: November 24, 1997
    Date of Patent: August 17, 1999
    Assignee: Nippon Sheet Glass Co., Ltd.
    Inventor: Kiminari Sugiura
  • Patent number: 5938808
    Abstract: A process for quenching a heated glass sheet is performed by apparatus (26) that includes a pair of quench units (28) between which the glass sheet is located with each quench unit having nozzles (34) for directing cryogenic flows (36) including a liquid (42) toward the oppositely facing surfaces (38) of the glass sheet so that the liquid completely vaporizes before penetrating the gas boundary layer (40) on each surface of the glass sheet. The cryogenic flows (36) can be initially completely liquid (42) or can be a two phase as the liquid (42) and a gas (44) with the latter preferably being done by spraying the two phase cryogenic flows as liquid droplets and the gas.
    Type: Grant
    Filed: July 31, 1998
    Date of Patent: August 17, 1999
    Assignee: Glasstech, Inc.
    Inventors: Ronald A. McMaster, Kenneth R. Kormanyos
  • Patent number: 5931981
    Abstract: A process for quenching heated glass sheets is performed by locating a glass sheet between a pair of spaced quench units (28) and directing from first and second arrays of nozzles (34, 64) cryogenic flows (36) interspersed with pressurized air flows (66) so as to cooperate with each other in providing the quenching. In one practice the interspersed cryogenic flows (36) and the pressurized air flows (66) are provided at the same time as each other. In another practice, the interspersed cryogenic flows (36) and pressurized air flows (66) are provided at different times.
    Type: Grant
    Filed: July 31, 1998
    Date of Patent: August 3, 1999
    Assignee: Glasstech, Inc.
    Inventors: Ronald A. McMaster, Kenneth R. Kormanyos
  • Patent number: 5928398
    Abstract: An apparatus for bending and tempering glass sheets includes a roll conveyor for supporting a glass sheet, the glass sheet having a top and a bottom surface. The roll conveyor includes a plurality of vertically movable rolls for arching the conveyor to a curvature corresponding to a desired degree of bending in the glass sheet. The rolls each have two opposed ends, and at least some of the rolls being deflectable such that at least mid-sections thereof are movable relative to a vertical position of ends thereof. The apparatus further includes a plurality of movable press rollers disposed above the rolls. The press rollers are movable in a vertical direction to apply a pressing force to the top surface of the glass sheet.
    Type: Grant
    Filed: December 22, 1995
    Date of Patent: July 27, 1999
    Assignee: Tamglass Engineering OY
    Inventor: Esko Lehto
  • Patent number: 5910620
    Abstract: A fire-rated glass 28 is comprised of a low-E glass which has been subject to a supertempering treatment.
    Type: Grant
    Filed: November 3, 1995
    Date of Patent: June 8, 1999
    Assignee: O'Keefe's, Inc.
    Inventors: William F. O'Keeffe, Mason Scott Foote
  • Patent number: 5865866
    Abstract: A cooling ring assembly (20) and method for controlling stresses in a bent glass sheet G produce a strengthened bent glass sheet after the cooling is completed. The cooling ring assembly includes a cooling ring (22) that supports the glass sheet edge (24), an insulator (30) juxtaposed inboard of the cooling ring to reduce the cooling rate, and a cooler (34) for providing increased cooling by pressurized air to at least one localized area (36,40,58) of the glass sheet edge. The cooler (34) is preferably embodied by a pressurized air supply (42).
    Type: Grant
    Filed: June 13, 1997
    Date of Patent: February 2, 1999
    Assignee: Glasstech, Inc.
    Inventors: James P. Schnabel, Jr., Donivan M. Shetterly, Robert E. Malby, Jr.
  • Patent number: 5846280
    Abstract: The process for producing a chemically prestressed glass of very high surface quality includes subjecting an Li.sub.2 O-free starting glass from the SiO.sub.2 -Al.sub.2 O.sub.3 -M.sub.2 O-MO system which also contains TiO.sub.2, CeO.sub.2 and F.sub.2 to chemical ion exchange by immersing it in a potassium salt bath at a temperature between 350.degree. C. and 550.degree. C. and at a residence time of between 0.5 and 20 hours to form the chemically prestressed glass. In a preferred embodiment of the process, the potassium salt bath contains a potassium nitrate melt and the glass is polished after prestressing. The chemically prestressed glass is particularly useful for making hard disks.
    Type: Grant
    Filed: April 24, 1997
    Date of Patent: December 8, 1998
    Assignee: Schott Glaswerke
    Inventor: Burkhard Speit
  • Patent number: 5846281
    Abstract: A method and apparatus for adjusting a quench head for glass tempering is provided. The quench head comprises at two nozzle blocks, each one of the nozzle blocks comprising at least one nozzle for directing the flow of a substance in gaseous phase to impinge onto the surface of the glass at certain areas. The nozzle blocks are supported on a frame to form at least one row of nozzle blocks. The frame comprises means for adjusting the tempering conditions effected to the surface of the glass to follow the shape of the surface of the glass. The directions of the flows of the substance in gaseous phase is adjusted such that the distance between the areas where a substance impinges the surface of a glass, between at least one pair of adjacent nozzle blocks and at least one row is kept substantially constant, regardless of the shape of the glass.
    Type: Grant
    Filed: July 1, 1997
    Date of Patent: December 8, 1998
    Inventors: Risto Nikander, Jouko Jarvinen
  • Patent number: 5837026
    Abstract: Air is blowed before an annealing step to corner portions in an inner face portion of a glass panel which has been press-formed in a mold to cool that portions to be stronger than the other portion whereby a temperature difference between the corner portions and the other portion is reduced.
    Type: Grant
    Filed: December 8, 1997
    Date of Patent: November 17, 1998
    Assignee: Asahi Glass Company Ltd.
    Inventors: Tsunehiko Sugawara, Toshikazu Ikezawa, Naoya Shimizu, Hiroshi Yamasaki
  • Patent number: 5827345
    Abstract: A method for heating, forming and tempering a glass sheet including the steps of heating at least one glass sheet to at least a first predetermined temperature, applying microwave energy to the glass sheet to heat the glass sheet to at least a second predetermined temperature, forming the glass sheet to a predetermined configuration, and cooling an outer surface of the glass sheet to at least a third predetermined temperature to temper the glass sheet.
    Type: Grant
    Filed: November 12, 1997
    Date of Patent: October 27, 1998
    Assignee: Ford Global Technologies, Inc.
    Inventors: Premakaran Tucker Boaz, Gary W. Sitzman
  • Patent number: 5782947
    Abstract: A method for heating a glass sheet includes the steps of heating a glass sheet to a first predetermined temperature and applying microwave energy to the glass sheet to heat the glass sheet to at least a second predetermined temperature to allow the glass sheet to be formed.
    Type: Grant
    Filed: November 12, 1997
    Date of Patent: July 21, 1998
    Assignee: Ford Global Technologies, Inc.
    Inventor: Premakaran Tucker Boaz
  • Patent number: 5779755
    Abstract: For tempering by contact of a glass sheet having a through hole, cooled clamping pieces coated with thermoresistant fibers having a high thermal conductivity act on the surfaces of the glass sheet heated to the tempering temperature. During the action of the clamping plates, the inner surfaces of the glass sheet defining the hole are struck by a cooling gas. The cooling gas is injected by a jet or nozzle tube located in a clamping plate within a bore, which passes coaxially through the air-permeable covering fabric and, after having been whirled up within the hole, escapes through the fabric via a backflow pipe surrounding the jet or nozzle tube.
    Type: Grant
    Filed: February 10, 1995
    Date of Patent: July 14, 1998
    Assignee: Saint Gobain Vitrage
    Inventors: Hans-Wemer Kuster, Carsten Bremer
  • Patent number: 5772717
    Abstract: A method of tempering an article is disclosed in which an article is heated so that the material making up the article is in an essentially stress-free state and the article thereafter is quenched and cooled. At the conclusion of the quenching, a stress pattern in initiated through the thickness of the article in which the midplane layer is in tension and the surface layers are in compression. This stress pattern is further developed during the cooling stage. The article is quenched by spraying the surfaces with a coolant, preferably comprising either liquid nitrogen or liquid air in the form of a two phase flow of liquid and vapor. The liquid is sprayed so that the surface tensile stress of the surface layers are not exceeded and the liquid does not accumulate on the surface layers as a film.
    Type: Grant
    Filed: September 20, 1996
    Date of Patent: June 30, 1998
    Assignee: The BOC Group, Inc.
    Inventors: Mark J. Kirschner, Hamdi Kozlu, Michael K. Sahm
  • Patent number: 5763343
    Abstract: Hard glass fire retardant glasses can be tempered in a conventional air tempering plant having heat transmission values of approximately 200-500 W/(m.sup.2 .times.K) yielding in the tempered state a fire resistance period of at least 30 minutes according to DIN 4102 and the safety properties according to DIN 1249 (safe break). In order to achieve the combination of fire resistance period and safety properties, the glasses must have a coefficient of thermal expansion .alpha..sub.20/300 of between 3 and 6.times.10.sup.-6 K.sup.-1, a specific thermal stress .phi. of between 0.3 and 0.5 N/(mm.sup.2 .times.K), a glass transition temperature Tg of between 535.degree. and 850.degree. C., a product of specific thermal stress .phi. multiplied by (Tg -20.degree. C.) of between 180 and 360 N/mm.sup.2, an upper annealing temperature (temperature at a viscosity of 10.sup.13 dpas) of over 560.degree. C., a softening temperature (temperature at a viscosity of 107.sup.7.6 dpas) of over 830.degree. C.
    Type: Grant
    Filed: January 29, 1997
    Date of Patent: June 9, 1998
    Assignee: Schott Glaswerke
    Inventors: Peter Brix, Werner Kiefer, Roland Leroux
  • Patent number: 5755845
    Abstract: The invention relates to the press bending and tempering of glass sheets, especially for use as glazings in vehicles. When the press bending system is not located in a heated environment such as a furnace, it is important to maintain the glass sheets at a sufficiently high temperature for an adequate degree of temper to be achieved on quenching the sheet. The present invention provides a method of bending and tempering a thin glass sheet comprising pressing the substantially horizontal sheet between moulds having opposed complementary shaping surfaces, at least one of the surfaces being heated, and subsequently quenching the surfaces of the sheet characterised in that the heated shaping surface is maintained at a temperature in the range from 200.degree. C. to 350.degree. C.
    Type: Grant
    Filed: January 3, 1997
    Date of Patent: May 26, 1998
    Assignees: Pilkington Glass Limited, Flachglas Aktiengesellschaft, Libbey-Owens-Ford Company
    Inventors: Alan Charles Woodward, Han-Dieter Funk, Richard A. Herrington
  • Patent number: 5735923
    Abstract: A glass plate is cooled and strengthened by placing the glass plate on a cooling ring in a substantially horizontal state and jetting out cooling air at upper and lower sides of the glass plate by upper and lower cooling air jetting-out devices arranged at the upper and lower sides of glass plate. The pressure of cooling air jetting out from the lower side of the glass plate is higher than that from the upper side to thereby raise the glass plate against a contact ring located below the upper jetting out device.
    Type: Grant
    Filed: April 8, 1997
    Date of Patent: April 7, 1998
    Assignee: Asahi Glass Company Ltd.
    Inventor: Katsumi Hisaeda
  • Patent number: 5676722
    Abstract: Glass plates are thermally or chemically tempered to increase flexural bending strength. The tempered plates are subsequently subjected to a heat treatment in order to lower the possibility of spontaneous breakage of the glass plates. According to the method according to the invention the glass plates are tempered at least twice and again heat-treated. At least the second heat treatment takes place at higher temperatures than were used previously. The treated glass plates have increased flexural bending strength and reduced tendency to spontaneous breakage.
    Type: Grant
    Filed: February 23, 1996
    Date of Patent: October 14, 1997
    Assignee: Vetrotech AG
    Inventors: Horst Seidel, Chrisoph Schmalt
  • Patent number: 5669951
    Abstract: This invention teaches a method for forming a tempered, coated, grooved and/or beveled decorative glass sheet. The decorative glass sheet includes a coating on a surface thereof and a groove or bevel formed in the surface. The coating is substantially registered with at least on peripheral edge of the groove or bevel such that the coating is not disposed within the groove or bevel. The decorative glass sheet is formed by applying a coating, preferably by screen printing, to a surface of the glass panel. The coating is fired so as to set the coating into the glass panel. A groove and/or bevel is formed in the coated surface. The glass panel is then tempered. Preferably, the step of firing the coating is followed by the step of cooling the glass panel at a rate sufficient to temper the glass panel and, more preferably, at a rate sufficient to induce heat strengthening.
    Type: Grant
    Filed: September 29, 1995
    Date of Patent: September 23, 1997
    Assignee: Glass Unlimited of High Point, Inc.
    Inventor: Keith L. Eichhorn
  • Patent number: 5656053
    Abstract: A method for heating and forming a glass sheet includes the steps of heating a glass sheet to at least a first predetermined temperature, applying microwave energy to the glass sheet to heat the glass sheet to at least a second predetermined temperature, cooling an outer surface of the glass sheet to at least a third predetermined temperature and forming the glass sheet using forming rollers to a predetermined configuration.
    Type: Grant
    Filed: September 7, 1995
    Date of Patent: August 12, 1997
    Assignee: Ford Motor Company
    Inventor: Premakaran Tucker Boaz
  • Patent number: 5656558
    Abstract: Hard glass fire retardant glasses can be tempered in a conventional air tempering plant having heat transmission values of approximately 200-500 W/(m.sup.2 .times.K) yielding in the tempered state a fire resistance period of at least 30 minutes according to DIN 4102 and the safety properties according to DIN 1249 (safe break). In order to achieve the combination of fire resistance period and safety properties, the glasses must have a coefficient of thermal expansion .alpha..sub.20/300 of between 3 and 6.times.10.sup.-6 K.sup.-1, a specific thermal stress .psi. of between 0.3 and 0.5N/(mm.sup.2 .times.K) , a glass transitione temperature Tg of between 535.degree. and 850.degree. C., a product of specific thermal stress .psi. multiplied by (Tg -20.degree. C.) of between 180 and 360N/mm.sup.2, an upper annealing temperature (temperature at a viscosity of 10.sup.13 dPas) of over 560.degree. C., a softening temperature (temperature at a viscosity of 10.sup.7.6 dPas) of over 830.degree. C.
    Type: Grant
    Filed: August 1, 1994
    Date of Patent: August 12, 1997
    Assignee: Schott Glaswerke
    Inventors: Peter Brix, Werner Kiefer, Roland LeRoux
  • Patent number: 5648172
    Abstract: This invention relates to a glass sheet having a low content of alkaline oxides and alkaline-earth oxides, in the composition of which the sum of the alkaline and alkaline-earth oxides is less than or equal to 15%, with a sodium oxide content less than or equal to 10%, the values being expressed in percentages by weight, at least one of the faces of which is constituted of a surface zone virtually devoid, notably, of alkaline ions.
    Type: Grant
    Filed: September 29, 1994
    Date of Patent: July 15, 1997
    Assignee: Saint-Gobain Vitrage International
    Inventors: Didier Jousse, Pablo Vilato, Catherine Geoffroy
  • Patent number: 5647882
    Abstract: Apparatus for heating or cooling plate-like or sheet-like flat glass in which the glass is blasted on both sides with a treatment gas, comprising a treatment zone for the flat glass moved substantially longitudinally in the direction of its plane, ejector ribs (5) arranged on both sides of the glass surface and extending transversely to the direction of movement of the flat glass for blowing out the treatment gas, and several ventilators (6) for generating the treatment gas stream supplied to the ejector ribs, with the special feature that at least two transverse flow ventilators per treatment zone are provided as ventilators (6) which are arranged in the vicinity of one or both longitudinal edges of the treatment zone and/or near the longitudinal axis (8) of the treatment zone and with the ventilator axis (7) extending approximately parallel to the direction of movement of the glass surface (10).
    Type: Grant
    Filed: October 14, 1994
    Date of Patent: July 15, 1997
    Assignee: Cattin Machines S.A.
    Inventor: Volker Thiessen
  • Patent number: 5584902
    Abstract: A high performance, durable sputter coated, heat-treatable glass which after heat-treatment exhibits about 76% or more visible transmittance, a hemispherical emissivity (E.sub.h) of about 0.16 or less, and a normal emissivity (E.sub.n) of about 0.12 or less is formed by sputter coating a layer system on a glass substrate which includes an undercoat and overcoat of Si.sub.3 N.sub.4, a silver layer, and two nickel or nichrome layers on opposite sides of the silver layer, and wherein the lower nickel-based layer is about three times as thick as the other nickel based layer. The increased thickness of the lower nickel-based layer allows the coated glass article to be both heat-treatable, and "low-E" after the heat-treatment. This allows matching with other known glasses in the family of layer components by way of the heat-treatment process.
    Type: Grant
    Filed: December 20, 1994
    Date of Patent: December 17, 1996
    Assignee: Guardian Industries Corp.
    Inventors: Klaus W. Hartig, Philip J. Lingle
  • Patent number: 5578104
    Abstract: The glass sheet is heated to a heat-softened condition in a furnace, and conveyed to a prescribed position above an upper shaping surface of a ring mold. The sheet is then transferred onto the ring mold by lowering part of the conveyor means, and bent by a process involving raising both the ring mold and the conveyor means. This combination minimizes the introduction of optical distortion into the sheet. A preferred bending process is to press bend the sheet between the ring mold and an opposed upper bending mold.
    Type: Grant
    Filed: April 12, 1995
    Date of Patent: November 26, 1996
    Assignee: Pilkington Glass Limited
    Inventors: Alan C. Woodward, Geoffrey Greenhalgh
  • Patent number: 5536581
    Abstract: A glass sheet annealing ring includes an insulating ring juxtaposed the inboard periphery of the annealing ring for reducing the cooling rate of the glass sheet in proximity to the insulating ring thereby reducing the magnitude of net inner band tension while maintaining edge compression as the glass sheet is cooled.
    Type: Grant
    Filed: October 11, 1994
    Date of Patent: July 16, 1996
    Assignee: Glasstech, Inc.
    Inventors: Donivan M. Shetterly, James P. Schnabel, Jr.
  • Patent number: 5484657
    Abstract: A method for the preparation of glass sheets with a view to laminating them consists of curving the glass sheets by causing them to pass one after another along a curved trajectory, then cooling them by passage between blowing chests, and of dispatching them by batches to the assembling station, and a laminated pane, the sheets of which have, in the central zone, a core compressive stress of from 1 to 50 MPa.
    Type: Grant
    Filed: November 16, 1994
    Date of Patent: January 16, 1996
    Assignee: Saint-Gobain Vitrage International
    Inventors: Franz Kramling, Herve Charrue, Frederic Weber, Bernard Letemps, Claude Didelot
  • Patent number: 5397647
    Abstract: A method for the preparation of glass sheets with a view to laminating them consists of curving the glass sheets by causing them to pass one after another along a curved trajectory, then cooling them by passage between blowing chests, and of dispatching them by batches to the assembling station, and a laminated pane, the sheets of which have, in the central zone, a core compressive stress of from 1 to 50 MPa.
    Type: Grant
    Filed: November 9, 1992
    Date of Patent: March 14, 1995
    Assignee: Saint-Gobain Vitrage International
    Inventors: Franz Kramling, Herve Charrue, Frederic Weber, Bernard Letemps, Claude Didelot
  • Patent number: 5395414
    Abstract: A novel display panel (10) has a high fidelity visual pattern with a full range of grey scale values, for instance, a marble or leather pattern, which is produced via a novel methodology (20). In accordance with the novel methodology (20), a high resolution visual pattern (31) and a mask pattern (32) are produced and separately printed. The patterns (31, 32) are then superimposed and exposed to a camera (33) which generates an enlarged photograph positive. A silk screen is produced from the enlarged photograph positive and used to print a high fidelity visual pattern onto a glass substrate (13). The glass substrate (13) and visual pattern (14) are then heated in a tempering oven to derive the display panel (10).
    Type: Grant
    Filed: April 14, 1993
    Date of Patent: March 7, 1995
    Assignee: Dover Designs, Inc.
    Inventors: Donald J. Matasick, Don Bratton
  • Patent number: 5385786
    Abstract: A glass sheet annealing ring includes an insulating ring juxtaposed the inboard periphery of the annealing ring for reducing the cooling rate of the glass sheet in proximity to the insulating ring thereby reducing the magnitude of net inner band tension while maintaining edge compression as the glass sheet is cooled.
    Type: Grant
    Filed: February 9, 1993
    Date of Patent: January 31, 1995
    Assignee: Glasstech, Inc.
    Inventors: Donivan M. Shetterly, James P. Schnabel, Jr.
  • Patent number: 5380348
    Abstract: Apparatus operable in accordance with the method of the present invention is provided for selectively cooling areas of a glass sheet during heating in the lehr in order to eliminate hot spots and minimize undesirable sagging of portions of the glass sheet. The apparatus includes a gas hearth block upon which the glass sheet is supported during heating and an air nozzle or air nozzles connected to a source of compressed room temperature air located over those areas of the glass sheet that tend to develop hot spots. The air nozzle or air nozzles blow cooler air onto those selected areas of the glass sheet and even out the temperature of the heated glass sheet. This may be done prior to forming and/or tempering the glass sheet. The method and apparatus of the present invention is particularly useful with automobile glazings, such as sidelights and rear windows, bearing peripheral dark banding which show an increased tendency to sag during heating, particularly at the top edge portions.
    Type: Grant
    Filed: June 21, 1993
    Date of Patent: January 10, 1995
    Assignee: Ford Motor Company
    Inventor: Premakaran T. Boaz
  • Patent number: 5368624
    Abstract: The invention relates to a method and apparatus for equalizing the temperature profile of glass sheets in a roller-equipped furnace included in a horizontal tempering plant. At least in the early stage of a heating cycle, the upper surface of a glass sheet is exposed to an intensified convection heat effect by blasting air into the furnace from blasting pipes (3) located close to the upper surface of a glass sheet. This blasting compensates for the vigorous heat transfer to the lower surface of a glass sheet in the early stage of a heating cycle, which is caused by hot rollers. The blasting range and spot is manoeuvred in the longitudinal direction of a furnace in a manner that, at any given time, the blasting is only applied to that longitudinal section of a furnace in which a movable glass sheet is located at a given time.
    Type: Grant
    Filed: June 16, 1993
    Date of Patent: November 29, 1994
    Assignee: Tamglass Engineering Oy
    Inventors: Esko O. Lehto, Jukka H. Vehmas, Jorma K. J. Vitkala
  • Patent number: 5337537
    Abstract: Glass bottles and other food containers or serving pieces are provided that are stronger and safer to use than present like articles, and that may easily and safely be caused to break into granules thereby reducing the bulk or volume of the used pieces. The granulation may be done at the point of consumption or use, thereby reducing storage space and bulk transportation costs. The granules are ecologically correct, innocuous as waste, and have a low litter profile.
    Type: Grant
    Filed: December 28, 1992
    Date of Patent: August 16, 1994
    Inventor: John J. Soughan
  • Patent number: 5252140
    Abstract: A solar cell substrate comprising a glass plate, and a transparent electrically conductive layer formed thereon, wherein said glass plate is tempered.
    Type: Grant
    Filed: March 29, 1990
    Date of Patent: October 12, 1993
    Inventors: Shigeyoshi Kobayashi, Susumu Yaba, Shinya Kikugawa, Stephen Muhl, Arun Madan
  • Patent number: 5236488
    Abstract: The invention relates to a method and apparatus for heat-strengthening glass sheets. A glass sheet heated close to a softening temperature is heat strengthened by cooling it at a certain controlled cooling rate. The cooling is effected in a space between cooling panels and the cooling panels are cooled by a gas jet which is applied to the surfaces of cooling panels facing away from the glass sheet. A cooling space temperature measurement can be used for controlling the power of a cooling jet.
    Type: Grant
    Filed: June 26, 1991
    Date of Patent: August 17, 1993
    Assignee: Tamglass Oy
    Inventor: Jukka H. Vehmas
  • Patent number: 5188651
    Abstract: A system is provided for heating and thermally conditioning glass sheets, wherein sheets are conveyed individually or in groups or loads through a tunnel-type heating furnace and thermal conditioning area upon a series of aligned rollers. The rollers are driven in groups, with each group having an independent drive mechanism. The independent drive mechanisms are provided with interrelated controls whereby the system is controlled in zones of one or more groups of rolls. A sheet or load of sheets is advanced into a zone, and the rolls within that zone are then driven to convey the sheet or load in an oscillating forward and reverse manner to oscillate the glass within the zone. The oscillation proceeds according to a predetermined schedule whereby the distances travelled by the sheet or load on each forward and reverse stroke varies according to a predetermined pattern so that the contact points between the glass and rolls is different upon each reversal in direction.
    Type: Grant
    Filed: December 18, 1991
    Date of Patent: February 23, 1993
    Assignee: Libbey-Owens-Ford Co.
    Inventor: Dennis M. Csehi
  • Patent number: 5183491
    Abstract: Disclosed is a material for a tempering process of glass plates utilizing a so-called contact process. It proposes a material with a base of an arrangement of thin metallic threads exhibiting a heat resistance on the order of 0.25.multidot.10.sup.-3 to 2.5.multidot.10.sup.-3 m.sup.2 .multidot.K.multidot.W.sup.-1 intended to be inserted between the cooling plates and the glass of a contact-tempering installation. The process makes it possible to temper glazings sufficiently so that they are used as automobile glazings and the durability of this thread-based material is compatible with an industrial usage.
    Type: Grant
    Filed: May 28, 1991
    Date of Patent: February 2, 1993
    Assignee: Saint-Gobain Recherche
    Inventors: Benoit D'Iribarne, Henri Mairlot, Paul Houang
  • Patent number: 5139552
    Abstract: A glass sheet such as an automobile window glass sheet is bent to shape and tempered at one stage by a sheet glass bending and tempering apparatus. The sheet glass bending and tempering apparatus has solid contact members for pressing a glass sheet, which has been heated nearly to its softening point, to a desired shape and depriving the glass sheet of heat to cool the glass sheet quickly, the solid contact means having a contact surface for contacting the glass sheet and depriving the glass heat of heat therethrough. The contact surface has a plurality of grooves defined therein, and a plurality of air outlet ports defined in each of the grooves, for applying cooling air to the glass sheet, and a plurality of air inlet ports defined in each of the grooves, for drawing the air applied to the glass sheet. When the opposite surfaces of the glass sheet are pressed by the solid contact members, the pressure is temporarily reduced and then increased again to cool the glass sheet.
    Type: Grant
    Filed: December 5, 1990
    Date of Patent: August 18, 1992
    Assignee: Nippon Sheet Glass Co., Ltd.
    Inventors: Hideo Yoshizawa, Toru Kasugai
  • Patent number: 5137560
    Abstract: Disclosed herein is a process for manufacturing glass with functional coating by the steps of: 1) forming a film on a predetermined portion of a glass plate by screen-printing or flexographic printing of a liquid for forming functional coating which contains therein a metal oxide material; and 2) baking said printed film simultaneously while heating the glass plate for the bending treatment and/or tempering treatment, to thereby form the functional coating containing the metal oxide as the principal constituent.
    Type: Grant
    Filed: March 8, 1991
    Date of Patent: August 11, 1992
    Assignee: Asahi Glass Company, Inc.
    Inventors: Shinya Ohmura, Hisakazu Tsuchiya, Akira Hirano