Patents by Inventor Ranjana C. Patel
Ranjana C. 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: 8569398Abstract: A fully curable jettable composition having a viscosity less than 30 cps at a temperature within the range of 15° C.-180° C. comprising (i) at least one low viscosity reactive resin; (ii) at least one higher viscosity resin having a viscosity greater than twice that of the low viscosity resin and a functionality of greater than or equal to 2; (iii) at least one curable toughener, (iv) at least one initiator for the polymerization of the resins, and (v) at least one stabilizer for delaying the curing of the resins of the composition. The composition can be jetted from piezo electric printing heads under the control of a computer program to form a multi-layered article, for example, a three dimensional article, in which the adjacent droplets merge and are cured homogeneously together.Type: GrantFiled: December 9, 2010Date of Patent: October 29, 2013Assignee: 3D Systems, Inc.Inventors: Ranjana C. Patel, Yong Zhao, Richard John Peace
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Patent number: 8334025Abstract: The present invention provides a low viscosity photocurable composition including (i) a cationically curable component (ii) a free radically active component (iii) an antimony-free cationic photoinitiator (v) a free radical photoinitiator, and (vi) a toughening agent. The photocurable composition can be cured using rapid prototyping techniques to form three-dimensional articles which can be used in various aerospace and investment casting applications.Type: GrantFiled: October 26, 2006Date of Patent: December 18, 2012Assignee: 3D Systems, Inc.Inventors: John Wai Fong, Richard N. Leyden, Laurence Messe, Ranjana C. Patel, Carole Chapelat
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Patent number: 8227048Abstract: The present invention provides a clear, low viscosity photocurable composition including (i) a cationically curable compound (ii) an acrylate-containing compound (iii) a polyol-containing mixture (iv) a cationic photoinitiator and (v) a free radical photoinitiator. The photocurable composition can be cured using rapid prototyping techniques to form opaque-white three-dimensional articles having ABS-like properties.Type: GrantFiled: September 12, 2006Date of Patent: July 24, 2012Assignee: 3D Systems, Inc.Inventors: Richard N. Leyden, Laurence Messe, Frank Tran, David L. Johnson, John Wai Fong, Carole Chapelat, Ranjana C. Patel
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Publication number: 20110293891Abstract: The present invention provides a clear, low viscosity photocurable composition including (i) a cationically curable compound (ii) an acrylate-containing compound (iii) a polyol-containing mixture (iv) a cationic photoinitiator and (v) a free radical photoinitiator. The photocurable composition can be cured using rapid prototyping techniques to form opaque-white three-dimensional articles having ABS-like properties.Type: ApplicationFiled: September 12, 2006Publication date: December 1, 2011Applicant: Huntsman International LLCInventors: Richard N. Leyden, Laurence Messe, Frank Tran, David L. Johnson, John Wal Fong, Carole Chapelat, Ranjana C. Patel
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Publication number: 20110195237Abstract: The present invention relates to a system and a resin relating to rapid prototyping. The System comprises: (a) an apparatus for producing a three-dimensional object from a light-sensitive material, wherein input optics (IO) and output optics (OO) facilitates transmission of light emitted from an illumination source via individually controllable light modulators (LM) of spatial light modulator (SLM) to an illumination area (IA), wherein said output optics (OO) enable focusing of the pattern of light from spatial light modulators (SLM) on an illumination area (IA); and (b) a resin composition comprising: (A) an acrylate component with (B) a methacrylate component and (C) a photo initiator.Type: ApplicationFiled: September 15, 2009Publication date: August 11, 2011Applicant: Huntsman International LLCInventors: Ranjana C. Patel, Jean-Jacques Lagref, Zoubai M. Cherkaoui, Carole Chapelat, Richard Frantz, Michael Rhodes, Beat Dobler
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Publication number: 20110082238Abstract: A fully curable jettable composition having a viscosity less than 30 cps at a temperature within the range of 15° C.-180° C. comprising (i) at least one low viscosity reactive resin; (ii) at least one higher viscosity resin having a viscosity greater than twice that of the low viscosity resin and a functionality of greater than or equal to 2; (iii) at least one curable toughener, (iv) at least one initiator for the polymerisation of the resins, and (v) at least one stabiliser for delaying the curing of the resins of the composition. The composition can be jetted from piezo electric printing heads under the control of a computer program to form a multi-layered article, for example, a three dimensional article, in which the adjacent droplets merge and are cured homogeneously together.Type: ApplicationFiled: December 9, 2010Publication date: April 7, 2011Applicant: Huntsman Advanced Materials Americas LLCInventors: Ranjana C. Patel, Yong Zhao, Richard John Peace
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Patent number: 7871556Abstract: A fully curable jettable composition having a viscosity less than 30 cps at a temperature within the range of 15° C.-180° C. comprising (i) at least one low viscosity reactive resin; (ii) at least one higher viscosity resin having a viscosity greater than twice that of the low viscosity resin and a functionality of greater than or equal to 2; (iii) at least one curable toughener, (iv) at least one initiator for the polymerization of the resins, and (v) at least one stabilizer for delaying the curing of the resins of the composition. The composition can be jetted from piezo electric printing heads under the control of a computer program to form a multi-layered article, for example, a three dimensional article, in which the adjacent droplets merge and are cured homogeneously together.Type: GrantFiled: December 14, 2009Date of Patent: January 18, 2011Assignee: Huntsman Advanced Materials Americas LLCInventors: Ranjana C. Patel, Yong Zhao, Richard John Peace
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Publication number: 20100092691Abstract: A fully curable jettable composition having a viscosity less than 30 cps at a temperature within the range of 15° C.-180° C. comprising (i) at least one low viscosity reactive resin; (ii) at least one higher viscosity resin having a viscosity greater than twice that of the low viscosity resin and a functionality of greater than or equal to 2; (iii) at least one curable toughener, (iv) at least one initiator for the polymerisation of the resins, and (v) at least one stabiliser for delaying the curing of the resins of the composition. The composition can be jetted from piezo electric printing heads under the control of a computer program to form a multi-layered article, for example, a three dimensional article, in which the adjacent droplets merge and are cured homogeneously together.Type: ApplicationFiled: December 14, 2009Publication date: April 15, 2010Applicant: Huntsman Advanced Materials Americas LLCInventors: Ranjana C. Patel, Yong Zhao, Richard John Peace
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Patent number: 7655174Abstract: 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: GrantFiled: May 23, 2003Date of Patent: February 2, 2010Assignee: Huntsman Advanced Materials Americas LLCInventors: Ranjana C Patel, Yong Zhao, Richard John Peace
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Publication number: 20100015408Abstract: The present invention provides a low viscosity photocurable composition including (i) a cationically curable component (ii) a free radically active component (iii) an antimony-free cationic photoinitiator (v) a free radical photoinitiator, and (vi) a toughening agent. The photocurable composition can be cured using rapid prototyping techniques to form three-dimensional articles which can be used in various aerospace and investment casting applications.Type: ApplicationFiled: October 26, 2006Publication date: January 21, 2010Applicant: Huntsman International LLCInventors: John Wai Fong, Richard Leyden, Laurence Messe, Ranjana C. Patel, Carole Vandenabeele
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Patent number: 7578958Abstract: 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 or liquid material, applying a liquid reagent to the layer in a pattern corresponding to the digital model, and repeating these steps to form successive layers. The powder or liquid material comprises a first reactive component and the applied liquid includes a second active component capable of reacting with the first reactive component so that the article is built up in layers. The characteristics of the layers vary across those layers and/or the properties vary from layer to layer.Type: GrantFiled: May 24, 2002Date of Patent: August 25, 2009Assignee: Huntsman Advanced Materials Americas Inc.Inventors: Ranjana C. Patel, Richard J. Peace, Yong Zhao
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Publication number: 20080241404Abstract: The invention provides an apparatus for building a three-dimensional article in sequential cross-sectional layers, which apparatus comprises: a powder delivery system comprising one or more reservoirs for delivering a powder and a powder spreading system; a printing system for delivering a liquid; a build chamber comprising a outer wall, an inner wall and a build platform which is movable along the inner wall of the build chamber; and a powder recovery system; wherein the building chamber comprises a space defined by the upper portion between the inner wall and the outer wall of the building chamber and this space is in communication with the powder recovery system and/or the build platform is capable of releasing unused powder (directly) from the build chamber in a downward direction into the powder recovery system. The invention further provides a method building a three-dimensional article wherein use is made of said apparatus.Type: ApplicationFiled: September 19, 2006Publication date: October 2, 2008Inventors: Sandrine Allaman, Rene Houben, German Enrique Knoppers, Ranjana C. Patel, Peter Sijtsma, Pascal Pierron
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Publication number: 20040145088Abstract: 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 or liquid material, applying a liquid reagent to the layer in a pattern corresponding to the digital model, and repeating these steps to form successive layers. The powder or liquid material comprises a first reactive component and the applied liquid includes a second active component capable of reacting with the first reactive component so that the article is built up in layers. The characteristics of the layers vary across those layers and/or the properties vary from layer to layer.Type: ApplicationFiled: March 24, 2004Publication date: July 29, 2004Inventors: Ranjana C Patel, Richard J Peace, Yong Zhao
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Publication number: 20010046642Abstract: 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: February 5, 2001Publication date: November 29, 2001Inventors: David L. Johnson, Richard Leyden, Ranjana C. Patel
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Patent number: 5766828Abstract: An infrared laser addressable imaging element comprising a substrate bearing a first layer comprising a reducible light-insensitive silver salt and a binder; and a second layer comprising an infrared absorber, a reducing agent for said silver salt and a binder; wherein said binder of said first layer is a polymeric medium having a glass transition temperature of at least 80.degree. C.Type: GrantFiled: September 9, 1996Date of Patent: June 16, 1998Assignee: Imation Corp.Inventors: Ranjana C. Patel, Jonathan C. Vogel
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Patent number: 4632895Abstract: Images can be formed on a receptor sheet by transfer of a dye image. The positive dye image is formed by bleaching of dye with an iodonium ion. The positive dye image is then transferred by sublimation or diffusion onto a receptor sheet.Type: GrantFiled: August 21, 1985Date of Patent: December 30, 1986Assignee: Minnesota Mining and Manufacturing CompanyInventors: Ranjana C. Patel, John H. A. Stibbard, Michael G. Fisher, Terence W. Baldock