Patents by Inventor Ravi K. Sura
Ravi K. Sura 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: 20180147766Abstract: Method for using sheets comprising co-extruded multi-component arrays that exhibit chromatically variable appearance dependent upon observation angle.Type: ApplicationFiled: May 27, 2016Publication date: May 31, 2018Inventors: Ravi K. Sura, Thomas P. Hanschen, Ronald W. Ausen, Bridget K. Warmka
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Patent number: 9625123Abstract: Lens assemblies for use in remote phosphor lighting systems, and methods of making and using them, are described. The lens assemblies typically include a lens member, a dichroic reflector attached to an outer surface of the lens member, and a phosphor layer attached to an inner surface of the lens member. The dichroic reflector reflects LED light originating from a given source point in a reference plane proximate the inner surface to a given image point in the reference plane. The phosphor layer may be patterned to cover one or more first portions of the inner surface and to expose one or more second portions, and/or the phosphor layer may be removably bonded to the inner surface. The lens assemblies can be readily combined with one or more short wavelength (e.g. blue) LEDs and other components to provide a remote phosphor lighting system.Type: GrantFiled: June 14, 2012Date of Patent: April 18, 2017Assignee: 3M INNOVATIVE PROPERTIES COMPANYInventors: Andrew J. Ouderkirk, Ravi K. Sura, Nicholas T. Gabriel, Huang Chin Hung
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Publication number: 20160347039Abstract: Sheets comprising co-extruded multi-component arrays that exhibit chromatically variable appearance dependent upon observation angle. Also, methods and apparatus for making such sheets and methods for using such sheets.Type: ApplicationFiled: May 27, 2016Publication date: December 1, 2016Inventors: Ravi K. Sura, Thomas P. Hanschen, Ronald W. Ausen, Bridget K. Warmka
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Publication number: 20150303129Abstract: A thermal interface material includes a conformable component and a thermally conductive filler dispersed in the conformable component. The material is provided in at least two segments laterally spaced from one another to define one or more gaps, each of the segments having a length, a width, and a height. The average aspect ratio of length to height and/or width to height of the at least two segments is between 1:10 and 10:1.Type: ApplicationFiled: November 6, 2013Publication date: October 22, 2015Inventors: Andrew J. Ouderkirk, Ravi K. Sura, Hun Jeong
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Publication number: 20140240928Abstract: A thermally conductive grease includes a carrier oil, at least one dispersant, and thermally conductive particles. The thermally conductive particles have a D50 (Vol. Average) particle size of no greater than about 11 microns and the thermally conductive particles in the thermally conductive grease contain less than 3% by volume of particles having a particle size of 0.7 microns or less, based on the total volume of thermally conductive particles in the thermally conductive grease.Type: ApplicationFiled: September 28, 2012Publication date: August 28, 2014Inventors: Pei Tien, Chia Hui Lin, Chao-Yuan Wang, Ravi K. Sura
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Publication number: 20140218938Abstract: Lens assemblies for use in remote phosphor lighting systems, and methods of making and using them, are described. The lens assemblies typically include a lens member, a dichroic reflector attached to an outer surface of the lens member, and a phosphor layer attached to an inner surface of the lens member. The dichroic reflector reflects LED light originating from a given source point in a reference plane proximate the inner surface to a given image point in the reference plane. The phosphor layer may be patterned to cover one or more first portions of the inner surface and to expose one or more second portions, and/or the phosphor layer may be removably bonded to the inner surface. The lens assemblies can be readily combined with one or more short wavelength (e.g. blue) LEDs and other components to provide a remote phosphor lighting system.Type: ApplicationFiled: June 14, 2012Publication date: August 7, 2014Applicant: 3M INNOVATIVE PROPERTIES COMPANYInventors: Andrew J. Ouderkirk, Ravi K. Sura, Nicholas T. Gabriel, Huang Chin Hung
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Patent number: 8308991Abstract: Provided are adhesive compositions comprising a mixture of a maleimide terminated polyimide resin, a thermoplastic resin compatible with the maleimide terminated polyimide resin, a liquid rubber, and a thermally activated free radical curing agent. Various embodiments add one or more of a silane coupling agent, an ethylenically unsaturated compound with acid functionality, electrically conductive particles, and electrically conductive scrim. Methods of using the compositions also are provided.Type: GrantFiled: September 9, 2008Date of Patent: November 13, 2012Assignee: 3M Innovative Properties CompanyInventors: Eric G. Larson, Robert L. D. Zenner, Cameron T. Murray, Ravi K. Sura
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Patent number: 7883769Abstract: The invention is directed in part to an article that includes a polymer foam having a surface with surface microstructures, the surface microstructures have at least one extent or dimension of about 10 microns or more, preferably 50 microns or more. A maximum extent (unless it is a continuous rib-like structure) the microstructure is about 300 microns or less, preferably 200 microns or less, and generally a maximum height of 1000 microns or less, preferably 750 microns or less and a minimum height of 200 microns or more, preferably 300 microns or more. The foamed article may be provided in a variety of shapes, including a rod, a cylinder, a sheet, etc. In a preferred embodiment where the foam is provided in the form of a sheet, the foam has a pair of major surfaces, one or both of which can be provided with surface microstructures.Type: GrantFiled: June 18, 2003Date of Patent: February 8, 2011Assignee: 3M Innovative Properties CompanyInventors: Jayshree Seth, Christopher K. Haas, Ravi K. Sura, Katherine A. S. Graham, Janet A. Venne
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Publication number: 20110008570Abstract: The invention is directed in part to an article that includes a polymer foam having a surface with surface microstructures, the surface microstructures have at least one extent or dimension of about 10 microns or more, preferably 50 microns or more. A maximum extent (unless it is a continuous rib-like structure) the microstructure is about 300 microns or less, preferably 200 microns or less, and generally a maximum height of 1000 microns or less, preferably 750 microns or less and a minimum height of 200 microns or more, preferably 300 microns or more. The foamed article may be provided in a variety of shapes, including a rod, a cylinder, a sheet, etc. In a preferred embodiment where the foam is provided in the form of a sheet, the foam has a pair of major surfaces, one or both of which can be provided with surface microstructures.Type: ApplicationFiled: September 23, 2010Publication date: January 13, 2011Inventors: Jayshree Seth, Christopher K. Haas, Ravi K. Sura, Katherine A.S. Graham, Janet A. Venne
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Publication number: 20100197533Abstract: The invention relates to thermally conductive greases that may contain carrier oil(s), dispersant(s), and thermally conductive particles, wherein the thermally conductive particles are a mixture of at least three distributions of thermally conductive particles, each of the at least three distributions of thermally conductive particles having an average (D50) particle size which differs from the other average particle sizes by at least a factor of five. The thermally conductive greases of the invention exhibit desirable rheological behavior during installation/application and during use of devices involving these materials.Type: ApplicationFiled: August 15, 2007Publication date: August 5, 2010Applicant: 3M Innovative Properties CompanyInventors: Philip E. Kendall, Ravi K. Sura
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Publication number: 20090087591Abstract: Provided are adhesive compositions comprising a mixture of a maleimide terminated polyimide resin, a thermoplastic resin compatible with the maleimide terminated polyimide resin, a liquid rubber, and a thermally activated free radical curing agent. Various embodiments add one or more of a silane coupling agent, an ethylenically unsaturated compound with acid functionality, electrically conductive particles, and electrically conductive scrim. Methods of using the compositions also are provided.Type: ApplicationFiled: September 9, 2008Publication date: April 2, 2009Inventors: Eric G. Larson, Robert L.D. Zenner, Cameron T. Murray, Ravi K. Sura
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Patent number: 7094463Abstract: The present invention is directed to a process for producing a polypropylene foam by mixing a high melt strength polypropylene and a blowing agent to form a melt mixture, reducing the temperature of the melt mixture at the exit of the apparatus to an exit temperature that is no more than 30° C. above the melt temperature of the neat polypropylene while maintaining the melt mixture at a pressure sufficient to prevent foaming; passing the mixture through said exit shaping orifice and exposing the mixture to atmospheric pressure, whereby the blowing agent expands causing cell formation resulting in foam formation, and orienting said foam. The foam is useful as tape backings, thermal and acoustical insulation and as a diffuse reflector for use in optical applications such as computer displays.Type: GrantFiled: December 30, 2002Date of Patent: August 22, 2006Assignee: 3M Innovative Properties CompanyInventors: Christopher K. Haas, Mark D. Gehlsen, Sara B. Mortenson, Joan M. Strobel, Ravi K. Sura, David L. Vall
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Patent number: 6977113Abstract: Microfiber articles and methods and intermediates for their production, the microfiber articles being preferably produced from co-extruded multi-layer films, and the articles having a multi-layer construction that allows selection of the different layers to have different properties.Type: GrantFiled: October 9, 2001Date of Patent: December 20, 2005Assignee: 3M Innovative Properties CompanyInventors: Robert S. Kody, Mario A. Perez, John W. Longabach, Kimberley D. Klepzig, John M. Sebastian, Terry R. Hobbs, Matthew J. Michel, Timothy J. Lindquist, Ravi K. Sura
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Patent number: 6890963Abstract: This invention relates to foams made by polymerizing high internal phase emulsions (HIPE) containing polyelectrolytes. The emulsions comprise a continuous oil phase and a co- or discontinuous aqueous phase. The resulting foams are useful as a separations medium.Type: GrantFiled: March 8, 2004Date of Patent: May 10, 2005Assignee: 3M Innovative Properties CompanyInventors: Susannah C. Clear, Ranjani V. Parthasarathy, Ravi K. Sura, Philip P. Soo
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Publication number: 20040258902Abstract: The invention is directed in part to an article that includes a polymer foam having a surface with surface microstructures, the surface microstructures have at least one extent or dimension of about 10 microns or more, preferably 50 microns or more. A maximum extent (unless it is a continuous rib-like structure) the microstructure is about 300 microns or less, preferably 200 microns or less, and generally a maximum height of 1000 microns or less, preferably 750 microns or less and a minimum height of 200 microns or more, preferably 300 microns or more. The foamed article may be provided in a variety of shapes, including a rod, a cylinder, a sheet, etc. In a preferred embodiment where the foam is provided in the form of a sheet, the foam has a pair of major surfaces, one or both of which can be provided with surface microstructures.Type: ApplicationFiled: June 18, 2003Publication date: December 23, 2004Applicant: 3M Innovative Properties CompanyInventors: Jayshree Seth, Christopher K. Haas, Ravi K. Sura, Katherine A.S. Graham, Janet A. Venne
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Publication number: 20040204510Abstract: This invention relates to foams made by polymerizing high internal phase emulsions (HIPE) containing polyelectrolytes. The emulsions comprise a continuous oil phase and a co- or discontinuous aqueous phase. The resulting foams are useful as a separations medium.Type: ApplicationFiled: March 8, 2004Publication date: October 14, 2004Applicant: 3M Innovative Properties CompanyInventors: Susannah C. Clear, Ranjani V. Parthasarathy, Ravi K. Sura, Philip P. Soo
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Patent number: 6750261Abstract: This invention relates to foams made by polymerizing high internal phase emulsions (HIPE) containing polyelectrolytes. The emulsions comprise a continuous oil phase and a co- or discontinuous aqueous phase. The resulting foams are useful as a separations medium.Type: GrantFiled: April 8, 2003Date of Patent: June 15, 2004Assignee: 3M Innovative Properties CompanyInventors: Susannah C. Clear, Ranjani V. Parthasarathy, Ravi K. Sura, Philip P. Soo
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Patent number: 6692823Abstract: Described are hydrophilic fibrillated articles that include melt-processable polymer and hydrophilic component such as hydrophilic surfactant or hydrophilic polymer, as well as methods of preparing such articles.Type: GrantFiled: December 19, 2001Date of Patent: February 17, 2004Assignee: 3M Innovative Properties CompanyInventors: Robert S. Kody, Mario A. Perez, Thomas P. Klun, Paul D. Graham, Christopher K. Haas, Ravi K. Sura, Diane R. Wolk, Julie S. Prudich, Larry R. Krepski, Terry R. Hobbs, John M. Sebastian, Paul DeRoussel
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Publication number: 20030138612Abstract: Described are hydrophilic fibrillated articles comprising melt-processable polymer and hydrophilic component such as hydrophilic surfactant or hydrophilic polymer, as well as methods of preparing such articles.Type: ApplicationFiled: December 19, 2001Publication date: July 24, 2003Applicant: 3M Innovative Properties CompanyInventors: Robert S. Kody, Mario A. Perez, Thomas P. Klun, Paul D. Graham, Christopher K. Haas, Ravi K. Sura, Diane R. Wolk, Julie S. Prudich, Larry R. Krepski, Terry R. Hobbs, John M. Sebastian, Paul DeRoussel
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Publication number: 20030105176Abstract: The present invention is directed to a process for producing a polypropylene foam by mixing a high melt strength polypropylene and a blowing agent to form a melt mixture, reducing the temperature of the melt mixture at the exit of the apparatus to an exit temperature that is no more than 30° C. above the melt temperature of the neat polypropylene while maintaining the melt mixture at a pressure sufficient to prevent foaming; passing the mixture through said exit shaping orifice and exposing the mixture to atmospheric pressure, whereby the blowing agent expands causing cell formation resulting in foam formation, and orienting said foam. The foam is useful as tape backings, thermal and acoustical insulation and as a diffuse reflector for use in optical applications such as computer displays.Type: ApplicationFiled: December 30, 2002Publication date: June 5, 2003Inventors: Christopher K. Haas, Mark D. Gehlsen, Sara B. Mortenson, Joan M. Strobel, Ravi K. Sura, David L. Vall