Patents by Inventor Ranjana Patel
Ranjana Patel 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: 8097399Abstract: An optical moulding process is disclosed comprising the sequential steps of: (a)(y) forming a layer of a photocurable composition; and (bXz) irradiating selected areas of the composition in the layer with radiation from a radiation source, thereby curing the composition in said selected areas and repeating the steps a) and b) on top of an earlier cured layer to form a three dimensional structure, wherein the radiation source used in step b) is a non-coherent source of radiation and wherein the photocurable composition comprises at least two curable components: (i) 45%-95% (and preferably at least 50%, more preferably at least 60%, e.g.Type: GrantFiled: March 21, 2005Date of Patent: January 17, 2012Assignee: 3D Systems, Inc.Inventors: Ranjana Patel, Michael Rhodes, Yong Zhao
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Patent number: 7964248Abstract: The present invention is directed to a photoinitiator composition comprising two different cationic photoinitiators and a photocurable composition comprising said photoinitiator composition. Moreover, the present invention relates to the use of the photoinitiator composition and the photocurable composition. Furthermore, the present invention relates to a process for producing a three dimensional article.Type: GrantFiled: April 9, 2008Date of Patent: June 21, 2011Assignee: Huntsman Advanced Materials Americas LLCInventors: John Wai Fong, Carole Chapelat, Loic Messe, Ranjana Patel, Laurence Messe
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Publication number: 20110042859Abstract: A process for forming a three-dimensional article in sequential layers in accordance with a digital model of the article. The process comprises the steps of defining a layer of a first liquid, applying a second liquid to the first liquid layer in a pattern corresponding to the digital model, and repeating these steps to form successive layers. The first liquid comprises a first active component and the second liquid includes a second active component capable of reacting with the first reactive component so that the article is built up in layers.Type: ApplicationFiled: November 2, 2010Publication date: February 24, 2011Applicant: Huntsman Advanced Materials Americas LLCInventors: Ranjana Patel, Richard J. Peace
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Publication number: 20100327493Abstract: The present invention is directed to a photoinitiator composition comprising two different cationic photoinitiators and a photocurable composition comprising said photoinitiator composition. Moreover, the present invention relates to the use of the photoinitiator composition and the photocurable composition. Furthermore, the present invention relates to a process for producing a three dimensional article.Type: ApplicationFiled: April 9, 2008Publication date: December 30, 2010Applicant: Huntsman Advanced Materials Americas LLCInventors: John Wai Fong, Carole Chapelat, Loic Messe, Ranjana Patel, Laurence Messe
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Patent number: 7767132Abstract: A process for forming a three-dimensional article in sequential layers in accordance with a digital model of the article. The process comprises the steps of defining a layer of powder material, applying a liquid reagent to the powder layer in a pattern corresponding to the digital model, and repeating these steps to form successive layers. The powder comprises a first reactive component and the liquid includes a second active component capable of reacting with the first reactive component so that the article is built up in layers.Type: GrantFiled: March 7, 2008Date of Patent: August 3, 2010Assignee: Huntsman Advanced Materials Americas, Inc.Inventors: Ranjana Patel, Richard J. Peace, Yong Zhao, Jeremy Powell, Michael Rhodes
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Patent number: 7718111Abstract: A photocurable composition comprising cationically curable compound, an acrylate-containing compound; a hydroxyl-containing compound; a cationic photoinitiator; and a free radical photoinitiator; wherein said composition has less than 0.54 equivalents of cationically curable groups, less than 0.10 equivalents of acrylate groups and less than 0.10 equivalents of hydroxyl 0groups per 100 grams of said composition.Type: GrantFiled: April 11, 2007Date of Patent: May 18, 2010Assignee: Huntsman Advanced Materials Americas Inc.Inventors: David L. Johnson, Frank Tran, John Fong, Richard Leyden, Ranjana Patel
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Publication number: 20100119835Abstract: The present invention relates to a photocurable composition comprising: (a) 30-80% by weight of an epoxy-containing component (b) 5 to 65% by weight of a compound containing an oxetane ring in its molecule; (c) 1-25% by weight of a polyol having a molecular weight Mw of 2.000 or higher, (d) an antimony-free cationic photoinitiator. wherein the percent by weight is based on the total weight of the photocurable composition. The curable resin composition can be used for photocurable coatings per se and in specific for stereolithography and other such three dimensional printing applications where a 3D object is formed.Type: ApplicationFiled: March 7, 2008Publication date: May 13, 2010Applicant: Huntsman International LLCInventors: Laurence Messe, Loic Messe, Carole Chapelat, Ranjana Patel
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Patent number: 7455804Abstract: A process for forming a three-dimensional article in sequential layers in accordance with a digital model of the article. The process comprises the steps of defining a layer of powder material, applying a liquid reagent to the powder layer in a pattern corresponding to the digital model, and repeating these steps to form successive layers. The powder comprises a first reactive component and the liquid includes a second active component capable of reacting with the first reactive component so that the article is built up in layers.Type: GrantFiled: February 12, 2002Date of Patent: November 25, 2008Assignee: Huntsman Advanced Materials Americas Inc.Inventors: Ranjana Patel, Richard J. Peace, Yong Zhao, Jeremy Powell, Michael Rhodes
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Publication number: 20080157436Abstract: A process for forming a three-dimensional article in sequential layers in accordance with a digital model of the article. The process comprises the steps of defining a layer of powder material, applying a liquid reagent to the powder layer in a pattern corresponding to the digital model, and repeating these steps to form successive layers. The powder comprises a first reactive component and the liquid includes a second active component capable of reacting with the first reactive component so that the article is built up in layers.Type: ApplicationFiled: March 7, 2008Publication date: July 3, 2008Applicant: Huntsman Advanced Materials Americas Inc.Inventors: Ranjana Patel, Richard J. Peace, Yong Zhao, Jeremy Powell, Michael Rhodes
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Publication number: 20070256781Abstract: A photocurable composition comprising cationically curable compound, an acrylate-containing compound; a hydroxyl-containing compound; a cationic photoinitiator; and a free radical photoinitiator; wherein said composition has less than 0.54 equivalents of cationically curable groups, less than 0.10 equivalents of acrylate groups and less than 0.10 equivalents of hydroxyl 0 groups per 100 grams of said composition.Type: ApplicationFiled: April 11, 2007Publication date: November 8, 2007Applicant: Huntsman Advanced Materials Americas Inc.Inventors: David Johnson, Frank Tran, John Fong, Richard Leyden, Ranjana Patel
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Publication number: 20070205528Abstract: An optical moulding process is disclosed comprising the sequential steps of: (a)(y) forming a layer of a photocurable composition; and (bXz) irradiating selected areas of the composition in the layer with radiation from a radiation source, thereby curing the composition in said selected areas and repeating the steps a) and b) on top of an earlier cured layer to form a three dimensional structure, wherein the radiation source used in step b) is a non-coherent source of radiation and wherein the photocurable composition comprises at least two curable components: (i) 45%-95% (and preferably at least 50%, more preferably at least 60%, e.g.Type: ApplicationFiled: March 21, 2005Publication date: September 6, 2007Applicant: Huntsman Advanced Materials Americans Inc.Inventors: Ranjana Patel, Michael Rhodes, Yong Zhao
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Patent number: 7232850Abstract: A photocurable composition comprising cationically curable compound, an acrylate-containing compound; a hydroxyl-containing compound; a cationic photoinitiator; and a free radical photoinitiator; wherein said composition has less than 0.54 equivalents of cationically curable groups, less than 0.10 equivalents of acrylate groups and less than 0.10 equivalents of hydroxyl groups per 100 grams of said composition.Type: GrantFiled: October 3, 2003Date of Patent: June 19, 2007Assignee: Huntsman Advanced Materials Americas Inc.Inventors: David Johnson, Frank Tran, John Fong, Richard Leyden, Ranjana Patel
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Publication number: 20060035034Abstract: A method is described of producing thin layers (below 10 ?m in thickness) by directing droplets (preferably by inkjet printing techniques) onto precise locations on a substrate, the liquid of the droplets having a viscosity such that the droplets, on impact with the substrate, spread out to form relics on the substrate that are at least 1.4 times the diameter of the droplets in flight, adjacent droplets merging to form a continuous layer on the substrate. The droplets may have different compositions to form images within the layer. Successive layers may be added to built up a three dimensional structure whose properties can be tailored by the compositions used to build up a composite.Type: ApplicationFiled: November 11, 2002Publication date: February 16, 2006Applicant: Huntsman Advance Materials Americas Inc.Inventors: Yonetatsu Matsumoto, Peggy Studer, Yong Zhao, Stefan Barny, Ranjana Patel
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Publication number: 20050228064Abstract: The present invention relates to a liquid, radiation-curable composition containing a cationically activated component, a cationic photoinitiator or a mixture of cationic photoinitiators, at least an effective amount of a compound having at least one terminal and/or pendant unsaturated group and at least one hydroxyl group in its molecule. The composition is free of free radical initiator. The compositions described herein are particularly useful in stereolithography process systems for producing three-dimensional articles.Type: ApplicationFiled: March 21, 2005Publication date: October 13, 2005Applicant: Huntsman Advanced Materials Americas Inc.Inventors: David Johnson, Richard Leyden, Ranjana Patel, Frank Tran
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Publication number: 20050171237Abstract: A fully curable jettable composition having a viscosity less than 30 cps at a temperature within the range of 15-180° C., more preferably at a temperature of 15-100° C., e.g. 60-80° C. the composition comprising: (A) at least one low viscosity reactive resin selected from the group consisting of compounds containing an oxetane ring, cycloaliphatic epoxy resins, tetrahydrofurans, hexahydropyrans and mono-functional (meth)acrylates, said resin having a molecular weight of not greater than 300 Daltons, e.g. 250 Daltons or less, and a viscosity at a temperature in the said range of less than 30 cps, e.g.Type: ApplicationFiled: May 23, 2003Publication date: August 4, 2005Inventors: Ranjana Patel, Yong Zhao, Richard Peace
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Publication number: 20050072519Abstract: A photocurable composition comprising cationically curable compound, an acrylate-containing compound; a hydroxyl-containing compound; a cationic photoinitiator; and a free radical photoinitiator; wherein said composition has less than 0.54 equivalents of cationically curable groups, less than 0.10 equivalents of acrylate groups and less than 0.10 equivalents of hydroxyl 0groups per 100 grams of said composition.Type: ApplicationFiled: October 3, 2003Publication date: April 7, 2005Inventors: David Johnson, Frank Tran, John Fong, Richard Leyden, Ranjana Patel
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Publication number: 20040207123Abstract: A process for forming a three-dimensional article in sequential layers in accordance with a digital model of the article. The process comprises the steps of defining a layer of a first liquid, applying a second liquid to the first liquid layer in a pattern corresponding to the digital model, and repeating these steps to form succesive layers. The first liquid comprises a first active component and the second liquid includes a second active component capable of reacting with the first reactive component so that the article is built up in layers.Type: ApplicationFiled: June 14, 2004Publication date: October 21, 2004Inventors: Ranjana Patel, Richard J. Peace
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Publication number: 20040036200Abstract: A process for forming a three-dimensional article in sequential layers in accordance with a digital model of the article. The process comprises the steps of defining a layer of powder material, applying a liquid reagent to the powder layer in a pattern corresponding to the digital model, and repeating these steps to form successive layers. The powder comprises a first reactive component and the liquid includes a second active component capable of reacting with the first reactive component so that the article is built up in layers.Type: ApplicationFiled: September 15, 2003Publication date: February 26, 2004Inventors: Ranjana Patel, Richard J. Peace, Yong Zhao, Jeremy Powell, Michael Rhodes