Patents by Inventor Rohit Rai
Rohit Rai 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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Publication number: 20180186675Abstract: According to one embodiment, a method of manufacturing a glass article having a three-dimensional shape includes heating a glass article blank to a temperature above a setting temperature and coupling the glass article blank to an open-faced mold. The open-faced mold includes a molding region that has a three-dimensional shape that generally corresponds to the shape of the glass article and has an anisothermal temperature profile within the molding region. The method further includes maintaining an anisothermal temperature profile along the glass article blank and cooling the glass article blank while the glass article blank is coupled to the molding region of the open-faced mold to set the shape of the glass article.Type: ApplicationFiled: February 27, 2018Publication date: July 5, 2018Inventors: Weiwei Luo, Rohit Rai, Ljerka Ukrainczyk, Zheming Zheng, Sam Samer Zoubi
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Patent number: 9975800Abstract: A glass sheet is formed on a mold into a glass article having a three-dimensional shape. The mold, with the glass article thereon, is arranged within an interior space of a radiation shield such that the mold is between a leading end barrier and a trailing end barrier of the radiation shield. The mold, glass article, and radiation shield are translated through a sequence of cooling stations while maintaining the mold between the leading and trailing end barriers, wherein the leading and trailing end barriers inhibit radiation heat transfer at leading and trailing ends of the mold.Type: GrantFiled: August 18, 2016Date of Patent: May 22, 2018Assignee: CORNING INCORPORATEDInventors: Thierry Luc Alain Dannoux, Raymond Chih Chung Hsiao, Nikolaos Pantelis Kladias, Rohit Rai, John Richard Ridge, John Robert Saltzer, Jr., Ljerka Ukrainczyk
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Patent number: 9938178Abstract: According to one embodiment, a method of manufacturing a glass article having a three-dimensional shape includes heating a glass article blank to a temperature above a setting temperature and coupling the glass article blank to an open-faced mold. The open-faced mold includes a molding region that has a three-dimensional shape that generally corresponds to the shape of the glass article and has an anisothermal temperature profile within the molding region. The method further includes maintaining an anisothermal temperature profile along the glass article blank and cooling the glass article blank while the glass article blank is coupled to the molding region of the open-faced mold to set the shape of the glass article.Type: GrantFiled: July 30, 2014Date of Patent: April 10, 2018Assignee: CORNING INCORPORATEDInventors: Weiwei Luo, Rohit Rai, Ljerka Ukrainczyk, Zheming Zheng, Sam Samer Zoubi
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Publication number: 20170283295Abstract: A mold stack for forming 3D glass-based articles includes a plenum and a cooling structure integrated with the plenum. The mold stack includes a mold with a flange that can be used to mount the mold on the plenum. The mold stack includes features to reduce mold warp without significantly increasing thermal mass.Type: ApplicationFiled: March 31, 2017Publication date: October 5, 2017Inventors: Jacob Immerman, Andrew Peter Kittleson, Rohit Rai, Ljerka Ukrainczyk
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Patent number: 9656899Abstract: A process using a three-piece mold for making a three-dimensionally shaped glass article having a flat area and a curved/bend area is disclosed. The process includes placing a glass sheet on a mold having a shaping surface with a desired surface profile for the shaped glass article including a flat area and a bend area, moving a flat area plunger toward the glass sheet to compress the glass sheet, heating a portion of the glass sheet corresponding to an area above the bend area of the mold to a temperature above a forming temperature, and moving a bend area plunger toward the heated glass sheet to compress the heated glass sheet. A temperature of the glass sheet in the area above the bend area of the mold is higher than a temperature of the glass sheet in the area above the flat area of the mold when compressing the heated glass sheet with the bend area plunger.Type: GrantFiled: October 15, 2015Date of Patent: May 23, 2017Inventors: Weiwei Luo, Elias Panides, Rohit Rai, Irene Marjorie Slater, Ljerka Ukrainczyk, Srinavasa Rao Vaddiraju, Sam Samer Zoubi
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Publication number: 20170121210Abstract: A method of shaping a glass-based substrate including placing a glass-based substrate on a mold having a mold surface with a 3D surface profile, heating the glass-based substrate to a shaping temperature, creating a sealed environment above the glass-based substrate, and adjusting the pressure in the sealed environment with a pressurized gas to conform the glass-based substrate to the profile of the mold surface to create a shaped glass-based article. The shaped glass-based article may be free of distortions having a height to width ratio greater than 2×10?4.Type: ApplicationFiled: October 27, 2016Publication date: May 4, 2017Inventors: Rohit Rai, John Richard Ridge, Ljerka Ukrainczyk
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Publication number: 20160368807Abstract: Embodiments disclosed herein include systems and methods for controlling material warp that include placing the shaped mold in a heating device, forming a glass material into a shaped mold, and cooling the glass material and the shaped mold to a predetermined viscosity of the glass material. Some embodiments include, a predetermined time prior to removing the glass material and the shaped mold from the heating device, holding the glass at the mold in the heating device where the heating device temperature is substantially equal to mold and glass temperature just prior to exiting to ambient temperature. Some embodiments include removing the glass material and the shaped mold from the heating device to further cool the glass material and the shaped mold at ambient temperature, where after removing the glass material and the shaped mold from the heating device, the glass material will exhibit controlled or desired material warp.Type: ApplicationFiled: June 14, 2016Publication date: December 22, 2016Inventors: Antoine Gaston Denis Bisson, Kevin Patrick McNelis, Rohit Rai, John Richard Ridge, Ljerka Ukrainczyk
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Publication number: 20160355428Abstract: A glass sheet is formed on a mold into a glass article having a three-dimensional shape. The mold, with the glass article thereon, is arranged within an interior space of a radiation shield such that the mold is between a leading end barrier and a trailing end barrier of the radiation shield. The mold, glass article, and radiation shield are translated through a sequence of cooling stations while maintaining the mold between the leading and trailing end barriers, wherein the leading and trailing end barriers inhibit radiation heat transfer at leading and trailing ends of the mold.Type: ApplicationFiled: August 18, 2016Publication date: December 8, 2016Inventors: Thierry Luc Alain Dannoux, Raymond Chih Chung Hsiao, Nikolaos Pantelis Kladias, Rohit Rai, John Richard Ridge, John Robert Saltzer, JR., Ljerka Ukrainczyk
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Patent number: 9469561Abstract: A glass sheet is placed on a mold and heated to a first temperature. The glass sheet is then formed into a glass article having a three-dimensional shape using the mold. An isothermal heat transfer device comprising at least one heat pipe is provided in thermal contact with the mold. With the glass article on the mold and the isothermal heat transfer device in thermal contact with the mold, the glass article, mold, and isothermal heat transfer device are transported along a thermally-graded channel to cool the glass article to a second temperature. During the transporting, the isothermal heat transfer device transfers heat from a relatively hot region of the mold to a relatively cold region of the mold.Type: GrantFiled: June 27, 2014Date of Patent: October 18, 2016Assignee: Corning IncorporatedInventors: Nikolaos P Kladias, Kenneth Spencer Morgan, Elias Panides, Rohit Rai, John R Ridge, Ljerka Ukrainczyk
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Patent number: 9446977Abstract: A glass sheet is formed on a mold into a glass article having a three-dimensional shape. The mold, with the glass article thereon, is arranged within an interior space of a radiation shield such that the mold is between a leading end barrier and a trailing end barrier of the radiation shield. The mold, glass article, and radiation shield are translated through a sequence of cooling stations while maintaining the mold between the leading and trailing end barriers, wherein the leading and trailing end barriers inhibit radiation heat transfer at leading and trailing ends of the mold.Type: GrantFiled: December 4, 2013Date of Patent: September 20, 2016Assignee: Corning IncorporatedInventors: Thierry Luc Alain Dannoux, Raymond Chihchung Hsiao, Nikolaos Pantelis Kladias, Rohit Rai, John Richard Ridge, John Robert Saltzer, Jr., Ljerka Ukrainczyk
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Publication number: 20160251255Abstract: Alkali aluminosilicate glasses that exhibit fast ion exchange performance and having low softening points that enable the glasses to be formed into non-planar, three-dimensional shapes. The glasses contain less than about 1 mol % of boron oxide and, in some embodiments, are substantially free of B2O3. Furthermore, these glasses have excess amounts of alkali oxides relative to both Al2O3 and P2O5, in order to improve melting behavior and ion exchange performance while still achieving sufficiently low softening points to allow for formability.Type: ApplicationFiled: February 10, 2016Publication date: September 1, 2016Inventors: Timothy Michael Gross, John Christopher Mauro, Yihong Mauro, Rohit Rai, Adama Tandia, Zhongzhi Tang
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Publication number: 20160031738Abstract: A process using a three-piece mold for making a three-dimensionally shaped glass article having a flat area and a curved/bend area is disclosed. The process includes placing a glass sheet on a mold having a shaping surface with a desired surface profile for the shaped glass article including a flat area and a bend area, moving a flat area plunger toward the glass sheet to compress the glass sheet, heating a portion of the glass sheet corresponding to an area above the bend area of the mold to a temperature above a forming temperature, and moving a bend area plunger toward the heated glass sheet to compress the heated glass sheet. A temperature of the glass sheet in the area above the bend area of the mold is higher than a temperature of the glass sheet in the area above the flat area of the mold when compressing the heated glass sheet with the bend area plunger.Type: ApplicationFiled: October 15, 2015Publication date: February 4, 2016Inventors: Weiwei Luo, Elias Panides, Rohit Rai, Irene Marjorie Slater, Ljerka Ukrainczyk, Srinavasa Rao Vaddiraju, Sam Samer Zoubi
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Patent number: 9187358Abstract: A process using a three-piece mold for making a three-dimensionally shaped glass article having a flat area and a curved/bend area is disclosed. The process includes placing a glass sheet on a mold having a shaping surface with a desired surface profile for the shaped glass article including a flat area and a bend area, moving a flat area plunger toward the glass sheet to compress the glass sheet, heating a portion of the glass sheet corresponding to an area above the bend area of the mold to a temperature above a forming temperature, and moving a bend area plunger toward the heated glass sheet to compress the heated glass sheet. A temperature of the glass sheet in the area above the bend area of the mold is higher than a temperature of the glass sheet in the area above the flat area of the mold when compressing the heated glass sheet with the bend area plunger.Type: GrantFiled: May 5, 2014Date of Patent: November 17, 2015Assignee: CORNING INCORPORATEDInventors: Weiwei Luo, Elias Panides, Rohit Rai, Irene Marjorie Slater, Ljerka Ukrainczyk, Srinivasa Rao Vaddiraju, Sam Samer Zoubi
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Publication number: 20150047393Abstract: According to one embodiment, a method of manufacturing a glass article having a three-dimensional shape includes heating a glass article blank to a temperature above a setting temperature and coupling the glass article blank to an open-faced mold. The open-faced mold includes a molding region that has a three-dimensional shape that generally corresponds to the shape of the glass article and has an anisothermal temperature profile within the molding region. The method further includes maintaining an anisothermal temperature profile along the glass article blank and cooling the glass article blank while the glass article blank is coupled to the molding region of the open-faced mold to set the shape of the glass article.Type: ApplicationFiled: July 30, 2014Publication date: February 19, 2015Inventors: Weiwei Luo, Rohit Rai, Ljerka Ukrainczyk, Zheming Zheng, Sam Samer Zoubi
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Publication number: 20140335322Abstract: A process using a three-piece mold for making a three-dimensionally shaped glass article having a flat area and a curved/bend area is disclosed. The process includes placing a glass sheet on a mold having a shaping surface with a desired surface profile for the shaped glass article including a flat area and a bend area, moving a flat area plunger toward the glass sheet to compress the glass sheet, heating a portion of the glass sheet corresponding to an area above the bend area of the mold to a temperature above a forming temperature, and moving a bend area plunger toward the heated glass sheet to compress the heated glass sheet. A temperature of the glass sheet in the area above the bend area of the mold is higher than a temperature of the glass sheet in the area above the flat area of the mold when compressing the heated glass sheet with the bend area plunger.Type: ApplicationFiled: May 5, 2014Publication date: November 13, 2014Applicant: CORNING INCORPORATEDInventors: Weiwei Luo, Elias Panides, Rohit Rai, Irene Marjorie Slater, Ljerka Ukrainczyk, Srinivasa Rao Vaddiraju, Sam Samer Zoubi
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Publication number: 20140305167Abstract: A glass sheet is placed on a mold and heated to a first temperature. The glass sheet is then formed into a glass article having a three-dimensional shape using the mold. An isothermal heat transfer device comprising at least one heat pipe is provided in thermal contact with the mold. With the glass article on the mold and the isothermal heat transfer device in thermal contact with the mold, the glass article, mold, and isothermal heat transfer device are transported along a thermally-graded channel to cool the glass article to a second temperature. During the transporting, the isothermal heat transfer device transfers heat from a relatively hot region of the mold to a relatively cold region of the mold.Type: ApplicationFiled: June 27, 2014Publication date: October 16, 2014Inventors: Nikolaos P. Kladias, Kenneth Spencer Morgan, Elias Panides, Rohit Rai, John R. Ridge, Ljerka Ukrainczyk
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Patent number: 8776550Abstract: A glass sheet is placed on a mold and heated to a first temperature. The glass sheet is then formed into a glass article having a three-dimensional shape using the mold. An isothermal heat transfer device comprising at least one heat pipe is provided in thermal contact with the mold. With the glass article on the mold and the isothermal heat transfer device in thermal contact with the mold, the glass article, mold, and isothermal heat transfer device are transported along a thermally-graded channel to cool the glass article to a second temperature. During the transporting, the isothermal heat transfer device transfers heat from a relatively hot region of the mold to a relatively cold region of the mold.Type: GrantFiled: October 22, 2012Date of Patent: July 15, 2014Assignee: Corning IncorporatedInventors: Nikolaos P Kladias, Kenneth Spencer Morgan, Elias Panides, Rohit Rai, John R Ridge, Ljerka Ukrainczyk
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Publication number: 20140157828Abstract: A glass sheet is formed on a mold into a glass article having a three-dimensional shape. The mold, with the glass article thereon, is arranged within an interior space of a radiation shield such that the mold is between a leading end barrier and a trailing end barrier of the radiation shield. The mold, glass article, and radiation shield are translated through a sequence of cooling stations while maintaining the mold between the leading and trailing end barriers, wherein the leading and trailing end barriers inhibit radiation heat transfer at leading and trailing ends of the mold.Type: ApplicationFiled: December 4, 2013Publication date: June 12, 2014Applicant: CORNING INCORPORATEDInventors: Thierry Luc Alain Dannoux, Raymond Chihchung Hsiao, Nikolaos Pantelis Kladias, Rohit Rai, John Richard Ridge, John Robert Saltzer, JR., Ljerka Ukrainczyk
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Publication number: 20130125588Abstract: A glass sheet is placed on a mold and heated to a first temperature. The glass sheet is then formed into a glass article having a three-dimensional shape using the mold. An isothermal heat transfer device comprising at least one heat pipe is provided in thermal contact with the mold. With the glass article on the mold and the isothermal heat transfer device in thermal contact with the mold, the glass article, mold, and isothermal heat transfer device are transported along a thermally-graded channel to cool the glass article to a second temperature. During the transporting, the isothermal heat transfer device transfers heat from a relatively hot region of the mold to a relatively cold region of the mold.Type: ApplicationFiled: October 22, 2012Publication date: May 23, 2013Inventors: Nikolaos P. Kladias, Kenneth Spencer Morgan, Elias Panides, Rohit Rai, John R. Ridge, Ljerka Ukrainczyk