Patents by Inventor Werner Kiefer
Werner Kiefer has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8869561Abstract: A device for the refining of a glass melt at high temperatures according to the skull pot principle is provided. The device includes a skull crucible having walls that are constructed from a plurality of pipes, a high-frequency coil for coupling electrical energy into the contents of the skull crucible, and an inlet and an outlet of the skull crucible being arranged in a melt surface region of the glass melt, wherein the inlet and the outlet are essentially arranged lying opposite one another.Type: GrantFiled: February 12, 2010Date of Patent: October 28, 2014Assignee: Schott AGInventors: Erich Rodek, Wolfgang Schmid-Bauer, Hilgegard Römer, Günter Weidmann, Werner Kiefer
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Patent number: 8424342Abstract: A method for melting inorganic materials, preferably glasses and glass-ceramics, in a melting unit with cooled walls is provided. The method includes selecting the temperature of at least one region of the melt is selected in such a way as to be in a range from Teff?20% to Teff+20%, where the temperature Teff is given by the temperature at which the energy consumption per unit weight of the material to be melted is at a minimum, with the throughput having been selected in such a way as to be suitably adapted to the required residence time.Type: GrantFiled: March 31, 2004Date of Patent: April 23, 2013Assignee: Schott AGInventors: Werner Kiefer, Hildegard Römer, Frank-Thomas Lentes, Guido Räke, Volker Ohmstede, Karin Naumann, Michael Leister, Gerhard Nuessle, Erich Rodek, Wolfgang Schmidbauer
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Publication number: 20100147031Abstract: A device for the refining of a glass melt at high temperatures according to the skull pot principle is provided. The device includes a skull crucible having walls that are constructed from a plurality of pipes, a high-frequency coil for coupling electrical energy into the contents of the skull crucible, and an inlet and an outlet of the skull crucible being arranged in a melt surface region of the glass melt, wherein the inlet and the outlet are essentially arranged lying opposite one another.Type: ApplicationFiled: February 12, 2010Publication date: June 17, 2010Inventors: Erich Rodek, Wolfgang Schmid-Bauer, Hilgegard Römer, Günter Weidmann, Werner Kiefer
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Patent number: 7694533Abstract: A method for the refining of glass by means of high temperatures in a skull crucible is provided. The method includes introducing a glass melt in the skull crucible through an inlet disposed at an upper region of the skull crucible, heating the skull crucible by irradiation of high-frequency energy, and discharging the glass melt from the skull crucible through an outlet disposed at the upper region, the outlet being disposed at a place essentially lying opposite the inlet.Type: GrantFiled: July 14, 2001Date of Patent: April 13, 2010Assignee: Schott GlasInventors: Erich Rodek, Wolfgang Schmid-Bauer, Hilgegard Römer, Günter Weidmann, Werner Kiefer
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Publication number: 20070266737Abstract: A device for the refining of a glass melt at high temperatures according to the skull pot principle is provided. The device includes a skull crucible having walls that are constructed from a plurality of pipes, a high-frequency coil for coupling electrical energy into the contents of the skull crucible, and an inlet and an outlet of the skull crucible being arranged in a melt surface region of the glass melt, wherein the inlet and the outlet are essentially arranged lying opposite one another.Type: ApplicationFiled: August 2, 2007Publication date: November 22, 2007Inventors: Erich Rodek, Wolfgnag Bauer, Hilgegard Romer, Gunter Weidmann, Werner Kiefer
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Publication number: 20060291528Abstract: A method for melting inorganic materials, preferably glasses and glass-ceramics, in a melting unit with cooled walls is provided. The method includes selecting the temperature of at least one region of the melt is selected in such a way as to be in a range from Teff?20% to Teff+20%, where the temperature Teff is given by the temperature at which the energy consumption per unit weight of the material to be melted is at a minimum, with the throughput having been selected in such a way as to be suitably adapted to the required residence time.Type: ApplicationFiled: April 2, 2003Publication date: December 28, 2006Inventors: Werner Kiefer, Hildegard Romer, Frank-Thomas Lentes, Guido Rake, Volker Ohmstede, Karin Naumann, Michael Leister, Gerhard Nuessle, Rodek Erich, Wolfgang Schmidbauer
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Patent number: 7137277Abstract: The invention relates to a method and a device for producing colored glasses. The aim of the invention is to obtain a paricularly intimate mixture and to enable a quick change of the melt at the same time. To this end, the following procedure steps are applied: a melt made of a compound or fragments of glass is produced, the glass melt is further processed in at least one additional vessel, the melt is supplied to a skull device (3) (skull pot or skull channel) during subsequent processing, a dye is supplied (6, 6.1) to the melt after the melt was in the melting station (1) but before the melt enters the skull device (3) or while said melt is in the skull device.Type: GrantFiled: August 16, 2000Date of Patent: November 21, 2006Assignee: Schott AGInventors: Hildegard Romer, Werner Kiefer, Wolfgang Schmidbauer
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Publication number: 20060128550Abstract: A process for producing a borate-containing, low-alkali material is provided. The process includes induction-heating a boron-containing melting material directly in an appliance using an alternating electromagnetic field. The, melting material as a constituent includes at least one metal oxide, the metal ions of which have a valency of at least two, in a quantitative proportion of at least 25 mol %, and in which the ratio of the molar substance quantities of silicon dioxide to borate in the melting material is less than or equal to 0.5.Type: ApplicationFiled: December 2, 2003Publication date: June 15, 2006Inventors: Michael Leister, Uwe Kolberg, Werner Kiefer, Sybill Nuttgens, Alexander Penkert, Silke Wolff, NIcole Surges
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Patent number: 7010941Abstract: A structural component for a device for the treatment of melts, especially of glass melts, having a base body of metal or of a metal alloy and a cooling system in which a cooling medium is led through the structural component for the leading-off of heat. The base body is provided with a coating of a material the decomposition temperature of which lies below the temperature of the melt, and the cooling system is designed and arranged in such manner that the temperature of the boundary layer of the melt that immediately surrounds the structural component lies below the decomposition temperature of the coating material.Type: GrantFiled: January 12, 2001Date of Patent: March 14, 2006Assignee: Schott AGInventors: Christian Kunert, Uwe Kolberg, Werner Kiefer, Hildegard Römer, Volker Ohmstede
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Patent number: 6912874Abstract: This invention relates to a device and a process for introducing gases into a hot medium, whereby device (1) contains a pipe (2) for introducing gas and a cooling jacket (3) that encases pipe (2).Type: GrantFiled: September 4, 2001Date of Patent: July 5, 2005Assignee: Schott GlasInventors: Christian Kunert, Werner Kiefer, Hildegard Roemer, Uwe Kolberg
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Patent number: 6817212Abstract: The invention relates to a skull pot for melting or refining glass or glass ceramics, comprising a pot wall (1), a pot base, and an induction coil (3) which surrounds said pot wall and through which high-frequency energy can be coupled into the contents of the pot. The pot wall is made up of a ring of metal pipes (1.1) which can be connected to a cooling medium, slot-type intermediate chambers being provided between adjacent metal pipes. The pot base has a run-off for the melt. The metal pipes (1.1) that form the pot wall (1) arm short-circuited with each other above the base in order to increase the degree of efficiency of the skull pot and especially, in order to even out the temperature profile of the melt throughout the depth of the melt.Type: GrantFiled: April 29, 2002Date of Patent: November 16, 2004Assignee: Schott GLASInventors: Hildegard Römer, Uwe Kolberg, Guido Räke, Werner Kiefer, Michael Kohl, Wolfgang Schmidbauer
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Patent number: 6810689Abstract: The invention relates to a process for the production of a glass melt. For the avoidance of the oxygen reboil the process is equipped with the following process stages or steps: a melting stage a refining stage a homogenizing and conditioning stage; in which before the homogenizing and conditioning stage the melt is heated to a temperature of over 1700° C.; in which polyvalent ions are present in the melt in a proportion of at least 0.5% by wt.Type: GrantFiled: January 25, 2001Date of Patent: November 2, 2004Assignee: Schott GlassInventors: Hildegard Römer, Werner Kiefer, Wolfgang Schmidbauer, Thomas Pfeiffer, Guido Räke
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Patent number: 6698244Abstract: The invention describes a method for refining molten glass materials, in which refining gas is generated by refining agents in the molten glass, and in which the molten glass is heated to a temperature of between 1650° C. and 2800° C., and the maximum release of refining gas by the refining agents takes place at over 1500° C.Type: GrantFiled: August 18, 2000Date of Patent: March 2, 2004Assignee: Schott GlasInventors: Hildegard Römer, Werner Kiefer, Detlef Köpsel, Peter Nass, Erich Rodek, Uwe Kolberg, Thomas Pfeiffer
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Publication number: 20040011080Abstract: The invention relates to a method and a device for refining a glass melt according to the skull pot principle. According to the invention, the inlet and outlet are located in the upper area of the crucible and lie diametrically opposite each other.Type: ApplicationFiled: July 16, 2003Publication date: January 22, 2004Inventors: Erich Rodek, Wolfgang Schmid Bauer, Hilgegard Romer, Gunter Weidmann, Werner Kiefer
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Patent number: 6630420Abstract: The silicate glass has a composition (in % by weight, based on oxide) of SiO2, 54-72; Al2O3, 0.5-7; ZrO2, 10-20; B2O3, 0-<5; Na2O, 3-<8; K2O, 0-5; with Na2O+K2O, 2-<8; CaO, 3-11; MgO, 0-10; SrO, 0-8; BaO, 0∝10; with CaO+MgO+SrO+BaO, >5-24; La2O3, 0-5; and TiO2, 0-4. The glass also contains at least 0.6 percent by weight of La2O3 or at least 0.1 percent by weight TiO2. The glass has a hydrolytic resistance in hydrolytic glass 1, an acid resistance in acid class 3 or better, preferably acid class 1, a caustic lye resistance in lye class 1, a glass transition temperature (Tg) of at least 650° C., a thermal expansion coefficient (&agr;20/300) of 4.1×10−6 to 7.4×10−6/K, a refractive index (nd) of 1.53 to 1.63, an Abbé number (&ngr;d) of 48 to 58 and a negative anomalous partial dispersion in a blue spectral region (&Dgr;Pg,F) of up to −0.0130.Type: GrantFiled: January 16, 2002Date of Patent: October 7, 2003Assignee: Schott GlasInventors: Karin Naumann, Norbert Greulich-Hickmann, Uwe Kolberg, Werner Kiefer, Simone Ritter
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Patent number: 6627569Abstract: The silicate glass has a composition (in % by weight, based on oxide) of SiO2, 54-72; Al2O3, 0.5-7; ZrO2, >10-<18; B2O3, 0-<5; Na2O, 2-<10; K2O1 0-5; with Na2O+K2O, 2-<10; caO, 3-11; MgO, 0-10; SrO, 0-8; BaO, 0-12; with CaO+MgO+SrO+BaO, >5-24; La2O3, 0-6; and TiO2, 0-4. The glass has at least 0.6% by weight of La2O3 or at least 0.1% by weight TiO2. The glass is in hydrolytic glass 1, acid class 3 or better, preferably acid class 1, and lye class 1. It has a glass transition temperature (Tg) of at least 640° C., a thermal expansion coefficient (&agr;20/30O) of 4.1×10−6 to 8.0×10−6/K, a refractive index (nd) of 1.53 to 1.63, an Abbé number (&ngr;d) of 47 to 66 and a negative anomalous partial dispersion in a blue spectral region (&Dgr;Pg,F) of up to −0.0130.Type: GrantFiled: July 5, 2001Date of Patent: September 30, 2003Inventors: Karin Naumann, Norbert Greulich-Hickmann, Uwe Kolberg, Werner Kiefer
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Patent number: 6588234Abstract: A device and method for the plaining of glasses or glass-ceramics. The device is provided with a melting vat, at least two plaining containers serially connected after the outlet of the melting vat, and at least one of the plaining containers is built in accordance with the skull principle from a plurality of metal tubes comprising a cooling agent connection and a high-frequency device for inductively coupling high-frequency energy into the contents of the plaining container.Type: GrantFiled: August 18, 2000Date of Patent: July 8, 2003Assignee: Schott GlassInventors: Werner Kiefer, Uwe Kolberg, Hildegard Römer, Stefan Schmitt, Wolfgang Schmidbauer
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Patent number: 6577667Abstract: According to the invention, the skull pot is provided with the following characteristics: a pot wall (1), a bottom (3) and an induction coil (9) which surrounds the pot wall (1) and by means of which high-frequency energy can be coupled into the contents of the pot. The pot wall (1) is made of a ring of metal pipes (1.1) which can be connected to a cooling medium. Slits are embodied between adjacent metal pipes (1.1). The metal pipes (1.1) are bent at a right angle at the upper ends thereof in such a way that said pipes extend towards the outside, when the pot wall (1) is viewed from above, and form a collar (2). The collar (2) is surrounded by an additional wall (upper wall 4). The upper edge of said wall is situated on a higher level than the collar (2) in such a way that the melt covers the collar (2) during operation.Type: GrantFiled: June 12, 2002Date of Patent: June 10, 2003Assignee: Schott GlasInventors: Hildegard Römer, Wolfgang Schmidbauer, Werner Kiefer, Guido Räke, Frank-Thomas Lentes
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Publication number: 20030051510Abstract: A device for the melting of highly pure optical glasses and/or for the treatment of melts is provided. The device is intended for a subsequent refining or homogenization process making use of the skull technique. The device uses a number of coated metal tubes whose surface is free of glass-coloring ions.Type: ApplicationFiled: July 10, 2002Publication date: March 20, 2003Applicant: Schott GlasInventors: Hildegard Romer, Uwe Kolberg, Werner Kiefer, Ernst-Walter Schafer, Guido Rake
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Patent number: 6414982Abstract: A high-frequency device for melting and refining inorganic compounds having a high-frequency oscillation system and a crucible. The high-frequency system includes an induction coil looping around the crucible and at least two oscillator circuits connectable in parallel to the induction coil and providing redundant high frequency energy. Each self-exciting oscillator includes one of the capacitors and the induction coil. The device may further include a power supply, a control cabinet having operating units, and a process control system.Type: GrantFiled: August 18, 2000Date of Patent: July 2, 2002Assignee: Schott GlasInventors: Guido Räke, Michael Kohl, Hildegard Römer, Wolfgang Schmidtbauer, Werner Kiefer