Patents by Inventor Srinivas Vemury
Srinivas Vemury 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: 11724954Abstract: A method for forming an optical quality glass is provided. The method includes contacting silica soot particles with a basic additive, forming a silica soot compact, and removing the basic additive from the silica soot compact. A method of forming a cladding portion of an optical fiber preform is also provided.Type: GrantFiled: August 2, 2021Date of Patent: August 15, 2023Assignee: Corning IncorporatedInventors: Steven Bruce Dawes, Lisa Ann Hogue, Kenneth Edward Hrdina, Srinivas Vemury
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Patent number: 11667558Abstract: A method of producing bi-modal particles includes the steps of igniting a first precursor gas using a primary burner thereby producing a first plurality of particles of a first size, fluidly transporting the first plurality of particles down a particle tube, igniting a second precursor gas using a secondary burner thereby producing a second plurality of particles of a second size, flowing the second plurality of particles into the first plurality of particles, and capturing the first and second plurality of particles.Type: GrantFiled: January 13, 2020Date of Patent: June 6, 2023Assignee: Corning IncorporatedInventors: Laura Beth Cook, Curtis Robert Fekety, Yunfeng Gu, Dale Robert Powers, Christopher Scott Thomas, Srinivas Vemury, Fei Xia, Chunfeng Zhou
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Publication number: 20210355020Abstract: A method for forming an optical quality glass is provided. The method includes contacting silica soot particles with a basic additive, forming a silica soot compact, and removing the basic additive from the silica soot compact. A method of forming a cladding portion of an optical fiber preform is also provided.Type: ApplicationFiled: August 2, 2021Publication date: November 18, 2021Inventors: Steven Bruce Dawes, Lisa Ann Hogue, Kenneth Edward Hrdina, Srinivas Vemury
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Patent number: 11111172Abstract: A method for forming an optical quality glass is provided. The method includes contacting silica soot particles with a basic additive, forming a silica soot compact, and removing the basic additive from the silica soot compact. A method of forming a cladding portion of an optical fiber preform is also provided.Type: GrantFiled: November 28, 2017Date of Patent: September 7, 2021Assignee: Corning IncorporatedInventors: Steven Bruce Dawes, Lisa Ann Hogue, Kenneth Edward Hrdina, Srinivas Vemury
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Patent number: 10829403Abstract: One embodiment of the disclosure relates to a method of cleaning silica-based soot or an article made of silica-based soot, the method comprising the step of treating silica-based soot or the article made of silica-based soot with at least one of the following compounds: (i) a mixture of CO and Cl2 in a carrier gas such that the total concentration of CO and Cl2 in the mixture is greater than 10% (by volume, in carrier gas) and the ratio of CO:Cl2 is between 0.25 and 5; (ii) CCl4 in a carrier gas, such that concentration CCl4 is greater than 1% (by volume, in carrier gas). Preferably, the treatment by CCl4 is performed at temperatures between 600° C., and 850° C. Preferably, the treatment with the CO and Cl mixture is performed at temperatures between 900° C. and 1200° C. The carrier gas may be, for example, He, Ar, N2, or the combination thereof.Type: GrantFiled: August 9, 2011Date of Patent: November 10, 2020Assignee: Corning IncorporatedInventors: Nicolas LeBlond, Pushkar Tandon, Srinivas Vemury
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Publication number: 20200148579Abstract: A method of producing bi-modal particles includes the steps of igniting a first precursor gas using a primary burner thereby producing a first plurality of particles of a first size, fluidly transporting the first plurality of particles down a particle tube, igniting a second precursor gas using a secondary burner thereby producing a second plurality of particles of a second size, flowing the second plurality of particles into the first plurality of particles, and capturing the first and second plurality of particles.Type: ApplicationFiled: January 13, 2020Publication date: May 14, 2020Inventors: Laura Beth Cook, Curtis Robert Fekety, Yunfeng Gu, Dale Robert Powers, Christopher Scott Thomas, Srinivas Vemury, Fei Xia, Chunfeng Zhou
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Patent number: 10562804Abstract: A method of producing bi-modal particles includes the steps of igniting a first precursor gas using a primary burner thereby producing a first plurality of particles of a first size, fluidly transporting the first plurality of particles down a particle tube, igniting a second precursor gas using a secondary burner thereby producing a second plurality of particles of a second size, flowing the second plurality of particles into the first plurality of particles, and capturing the first and second plurality of particles.Type: GrantFiled: March 10, 2017Date of Patent: February 18, 2020Assignee: Corning IncorporatedInventors: Laura Beth Cook, Curtis Robert Fekety, Yunfeng Gu, Dale Robert Powers, Christopher Scott Thomas, Srinivas Vemury, Fei Xia, Chunfeng Zhou
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Publication number: 20180148366Abstract: A method for forming an optical quality glass is provided. The method includes contacting silica soot particles with a basic additive, forming a silica soot compact, and removing the basic additive from the silica soot compact. A method of forming a cladding portion of an optical fiber preform is also provided.Type: ApplicationFiled: November 28, 2017Publication date: May 31, 2018Inventors: Steven Bruce Dawes, Lisa Ann Hogue, Kenneth Edward Hrdina, Srinivas Vemury
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Publication number: 20170267569Abstract: A method of producing bi-modal particles includes the steps of igniting a first precursor gas using a primary burner thereby producing a first plurality of particles of a first size, fluidly transporting the first plurality of particles down a particle tube, igniting a second precursor gas using a secondary burner thereby producing a second plurality of particles of a second size, flowing the second plurality of particles into the first plurality of particles, and capturing the first and second plurality of particles.Type: ApplicationFiled: March 10, 2017Publication date: September 21, 2017Inventors: Laura Beth Cook, Curtis Robert Fekety, Yunfeng Gu, Dale Robert Powers, Christopher Scott Thomas, Srinivas Vemury, Fei Xia, Chunfeng Zhou
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Patent number: 9199870Abstract: A high-surface quality glass sheet is formed using a roll-to-roll glass soot deposition and sintering process. The glass sheet formation involves providing glass soot particles, depositing a first fraction of the glass soot particles on a deposition surface to form a supported soot layer, electrostatically attracting and collecting a second fraction of the glass soot particles onto a surface of a charged plate, removing the soot layer from the deposition surface to form a soot sheet, and heating at least a portion of the soot sheet to sinter the glass soot particles to form a glass sheet.Type: GrantFiled: May 22, 2012Date of Patent: December 1, 2015Assignee: CORNING INCORPORATEDInventors: Daniel Warren Hawtof, Brenton Allen Noll, Srinivas Vemury
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Publication number: 20130316136Abstract: A high-surface quality glass sheet is formed using a roll-to-roll glass soot deposition and sintering process. The glass sheet formation involves providing glass soot particles, depositing a first fraction of the glass soot particles on a deposition surface to form a supported soot layer, electrostatically attracting and collecting a second fraction of the glass soot particles onto a surface of a charged plate, removing the soot layer from the deposition surface to form a soot sheet, and heating at least a portion of the soot sheet to sinter the glass soot particles to form a glass sheet.Type: ApplicationFiled: May 22, 2012Publication date: November 28, 2013Inventors: Daniel Warren Hawtof, Brenton Allen Noll, Srinivas Vemury
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Publication number: 20120276291Abstract: Methods and apparatuses for vaporizing liquid precursor material for use in a vapor deposition process are disclosed. The method for vaporizing liquid precursor material includes introducing a flow of liquid precursor material into an expansion chamber and directing the flow of liquid precursor material towards a wall of the chamber. The wall of the chamber is heated to a temperature sufficient to vaporize a first portion of the flow of liquid precursor material while a second portion of the flow of liquid precursor material remains in a liquid state and a third portion of the liquid precursor material is formed into gel. The expansion chamber is continuously drained as the flow of liquid precursor material is introduced into the expansion chamber. The chamber is heated to a temperature to produce a sufficient amount of the second portion of the liquid precursor material to flush the gel from the chamber.Type: ApplicationFiled: April 28, 2011Publication date: November 1, 2012Inventors: Chester D. Bird, Dale Robert Powers, Pushkar Tandon, Srinivas Vemury
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Publication number: 20120202674Abstract: One embodiment of the disclosure relates to a method of cleaning silica-based soot or an article made of silica-based soot, the method comprising the step of treating silica-based soot or the article made of silica-based soot with at least one of the following compounds: (i) a mixture of CO and Cl2 in a carrier gas such that the total concentration of CO and Cl2 in the mixture is greater than 10% (by volume, in carrier gas) and the ratio of CO:Cl2 is between 0.25 and 5; (ii) CCl4 in a carrier gas, such that concentration CCl4 is greater than 1% (by volume, in carrier gas). Preferably, the treatment by CCl4 is performed at temperatures between 600° C., and 850° C. Preferably, the treatment with the CO and Cl mixture is performed at temperatures between 900° C. and 1200° C. The carrier gas may be, for example, He, Ar, N2, or the combination thereof.Type: ApplicationFiled: August 9, 2011Publication date: August 9, 2012Inventors: Nicolas LeBlond, Pushkar Tandon, Srinivas Vemury
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Publication number: 20040099013Abstract: An apparatus and method for fabricating an optical fiber, an optical fiber preform, and an optical fiber core rod are disclosed herein. In particular, the process of fabricating an optical fiber preform involves, during a modified chemical vapor deposition process, collapsing the substrate tube into an optical fiber preform, and compressing the optical fiber preform in the longitudinal direction. An optical fiber preform that is shorter, but larger in diameter is thus formed. The optical fiber preforms therefore can be stacked during the optical fiber fabrication process, which is useful in drawing longer optical fibers with comparable outer diameter and core diameter to that used as the industry standard.Type: ApplicationFiled: November 25, 2002Publication date: May 27, 2004Applicant: Fitel USA Corp.Inventors: James W. Fleming, Srinivas Vemury
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Patent number: 6481721Abstract: A method and apparatus for maintaining the pressure in an overclad tube at a reduced level despite axial movement of the tube during performance of an RIT overcladding operation. The overcladding tube is held by means of the lathe chuck, and a tubular extension of a rotary union member extends into the tube. The distal end of the extension has a sealing member replaceably mounted thereon which forms a seal with the interior wall of the tube. A vacuum source thus is enabled to connect to the interior of the overcladding tube through the rotary union, the extension tube, and the seal.Type: GrantFiled: July 15, 1999Date of Patent: November 19, 2002Assignee: Lucent Technologies Inc.Inventors: Peter Michael Mueller, Srinivas Vemury
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Patent number: 6254940Abstract: The present invention related to methods of manufacturing oxide, nitride, carbide, and boride powders and other ceramic, organic, metallic, carbon and alloy powders and films and their mixtures having well-controlled size and crystallinity characteristics. This invention relates, more particularly, to a development in the synthesis of the ceramic, metallic, composite, carbon and alloy nanometer-sized particles with precisely controlled specific surface area, or primary particle size, crystallinity and composition. The product made using the process of the present invention and the use of that product are also claimed herein.Type: GrantFiled: May 26, 1999Date of Patent: July 3, 2001Assignee: University of CincinnatiInventors: Sotiris E. Pratsinis, Srinivas Vemury
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Patent number: 5861132Abstract: A gas phase process for the production of titanium dioxide powders having well-controlled crystalline and surface area characteristics is disclosed. In this process, which is preferably carried out in a laminar diffusion flame reactor, vapor phase TiCl.sub.4 and oxygen are mixed in a reaction area which is heated externally. The titanium dioxide powder formed is then collected. It is preferred that the heat source used be a hydrocarbon fueled (e.g., methane) flame. Optionally, a vapor phase dopant (such as SiCl.sub.4) may be added to the reaction mixture to desirably affect the physical properties of the titanium dioxide produced. In a particularly preferred embodiment, a corona electric field is positioned across the area where the combustion reaction takes place (i.e., the reaction area). High anatase, high surface area titanium dioxide powders made by this process are excellent photocatalysts. The products of this process and the use of those products as photocatalysts are also disclosed.Type: GrantFiled: September 4, 1997Date of Patent: January 19, 1999Assignee: University of CincinnatiInventors: Sotiris Emmanuel Pratsinis, Srinivas Vemury, George P. Fotou, Andreas Gutsch
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Patent number: 5698177Abstract: A gas phase process for the production of titanium dioxide powders having well-controlled crystalline and surface area characteristics is disclosed. In this process, which is preferably carried out in a laminar diffusion flame reactor, vapor phase TiCl.sub.4 and oxygen are mixed in a reaction area which is heated externally. The titanium dioxide powder formed is then collected. It is preferred that the heat source used be a hydrocarbon fueled (e.g., methane) flame. Optionally, a vapor phase dopant (such as SiCl.sub.4) may be added to the reaction mixture to desirably affect the physical properties of the titanium dioxide produced. In a particularly preferred embodiment, a corona electric field is positioned across the area where the combustion reaction takes place (i.e., the reaction area). High anatase, high surface area titanium dioxide powders made by this process are excellent photocatalysts. The products of this process and the use of those products as photocatalysts are also disclosed.Type: GrantFiled: June 8, 1995Date of Patent: December 16, 1997Assignees: University of Cincinnati, Universitat KarlsruheInventors: Sotiris Emmanuel Pratsinis, Srinivas Vemury, George P. Fotou, Andreas Gutsch