Patents by Inventor Senthil Kumar Ramadas
Senthil Kumar Ramadas 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: 10745795Abstract: The present invention refers to a graded barrier film comprising a layered structure, wherein the layered structure comprises a first layer consisting of metal oxide; an intermediate layer consisting of metal nitride or metal oxynitride which is arranged on the first layer; and a third layer consisting of a metal oxide which is arranged on the intermediate layer. The present invention further refers to a sputtering method for manufacturing this graded barrier film and a device encapsulated with this graded barrier film.Type: GrantFiled: April 28, 2009Date of Patent: August 18, 2020Assignee: Agency for Science, Technology and ResearchInventors: Senthil Kumar Ramadas, Zin Ma Shwe
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Publication number: 20190027414Abstract: Disclosed is an encapsulation barrier stack, capable of encapsulating a moisture and/or oxygen sensitive article and comprising a multilayer film, wherein the multilayer film comprises: one or more barrier layer(s) having low moisture and/or oxygen permeability, and one or more sealing layer(s) arranged to be in contact with a surface of the at least one barrier layer, thereby covering defects present in the barrier layer, wherein the one or more sealing layer(s) comprise(s) a plurality of encapsulated nanoparticles, the nanoparticles being reactive in that they are capable of interacting with moisture and/or oxygen to retard the permeation of moisture and/or oxygen through the defects present in the barrier layer. The encapsulation of the particles can be obtained by polymerising a polymerisable compound (a monomeric or a polymeric compound with polymerisible groups or) cross-linking a cross-linkable compound on the surface of the reactive nanoparticles.Type: ApplicationFiled: September 24, 2018Publication date: January 24, 2019Applicants: Agency for Science, Technology and Research, Tera-Barrier Films PTE LTD.Inventors: Senthil Kumar Ramadas, Saravanan Shanmugavel
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Patent number: 10103359Abstract: The present invention refers to a multilayer barrier film capable of encapsulating a moisture and/or oxygen sensitive electronic or optoelectronic device, the barrier film comprises at least one nanostructured layer comprising reactive nanoparticles capable of interacting with moisture and/or oxygen, the reactive nanoparticles being distributed within a polymeric binder, and at least one ultraviolet light neutralizing layer comprising a material capable of absorbing ultraviolet light, thereby limiting the transmission of ultraviolet light through the barrier film.Type: GrantFiled: April 8, 2009Date of Patent: October 16, 2018Assignee: AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCHInventors: Senthil Kumar Ramadas, Soo Jin Chua, Lin Karen Ke
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Patent number: 9799854Abstract: The present invention relates to a multilayer barrier film capable of encapsulating a moisture and/or oxygen sensitive electronic or optoelectronic device, the barrier film including at least one nanostructured layer including reactive nanoparticles capable of interacting with moisture and/or oxygen, the reactive nanoparticles being distributed within a polymeric binder, and at least one ultraviolet light neutralizing layer comprising a material capable of absorbing ultraviolet light, thereby limiting the transmission of ultraviolet light through the barrier film.Type: GrantFiled: December 13, 2013Date of Patent: October 24, 2017Assignee: AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCHInventors: Senthil Kumar Ramadas, Soo Jin Chua, Lin Karen Ke
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Publication number: 20170098799Abstract: A barrier stack for encapsulating a moisture and/or oxygen sensitive electronic device is provided. The barrier stack comprises a multilayer film having at least one barrier layer having low moisture and/or oxygen permeability, and at least one sealing layer arranged to be in contact with a surface of the barrier layer, wherein the sealing material comprises reactive nanoparticles capable of interacting with moisture and/or oxygen, thereby retarding the permeation of moisture and/or oxygen through defects present in the barrier layer.Type: ApplicationFiled: October 7, 2016Publication date: April 6, 2017Inventors: Senthil Kumar RAMADAS, Soo Jin CHUA
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Patent number: 9493348Abstract: A barrier stack for encapsulating a moisture and/or oxygen sensitive electronic device is provided. The barrier stack comprises a multilayer film having at least one barrier layer having low moisture and/or oxygen permeability, and at least one sealing layer arranged to be in contact with a surface of the barrier layer, wherein the sealing material comprises reactive nanoparticles capable of interacting with moisture and/or oxygen, thereby retarding the permeation of moisture and/or oxygen through defects present in the barrier layer.Type: GrantFiled: November 6, 2006Date of Patent: November 15, 2016Assignee: Agency for Science, Technology and ResearchInventors: Senthil Kumar Ramadas, Soo Jin Chua
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Publication number: 20160088756Abstract: Disclosed is an encapsulation barrier stack, capable of encapsulating a moisture and/or oxygen sensitive article and comprising a multilayer film, wherein the multilayer film comprises: one or more barrier layer(s) having low moisture and/or oxygen permeability, and one or more sealing layer(s) arranged to be in contact with a surface of the at least one barrier layer, thereby covering defects present in the barrier layer, wherein the one or more sealing layer(s) comprise(s) a plurality of dendrimer encapsulated nanoparticles, the nanoparticles being reactive in that they are capable of interacting with moisture and/or oxygen to retard the permeation of moisture and/or oxygen through the defects present in the barrier layer.Type: ApplicationFiled: May 2, 2014Publication date: March 24, 2016Inventor: Senthil Kumar RAMADAS
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Publication number: 20150314941Abstract: Disclosed is an encapsulation barrier stack, capable of encapsulating a moisture and/or oxygen sensitive article and comprising a film layer with at least one layer, wherein the film layer comprises: one or more nanoparticle sealing layer(s) arranged to be in contact with surface of the at least one substrate, wherein the substrate is not a barrier layer, wherein the one or more nano-particle sealing layer(s) comprise(s) a plurality of encapsulated nanoparticles, the nanoparticles being reactive in that they are capable of interacting with moisture and/or oxygen to retard the permeation of moisture and/or oxygen.Type: ApplicationFiled: October 18, 2013Publication date: November 5, 2015Inventors: Senthil Kumar RAMADAS, Saravan SHANMUGAVEL
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Publication number: 20140252342Abstract: Disclosed is an encapsulation barrier stack, capable of encapsulating a moisture and/or oxygen sensitive article and comprising a multilayer film, wherein the multilayer film comprises: one or more barrier layer(s) having low moisture and/or oxygen permeability, and one or more sealing layer(s) arranged to be in contact with a surface of the at least one barrier layer, thereby covering defects present in the barrier layer, wherein the one or more sealing layer(s) comprise(s) a plurality of encapsulated nano-particles, the nanoparticles being reactive in that they are capable of interacting with moisture and/or oxygen to retard the permeation of moisture and/or oxygen through the defects present in the barrier layer. The encapsulation of the particles can be obtained by polymerising a polymerisable compound (a monomeric or a polymeric compound with polymerisible groups or) cross-linking a cross-linkable compound on the surface of the reactive nanoparticles.Type: ApplicationFiled: October 24, 2012Publication date: September 11, 2014Applicant: AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCHInventors: Senthil Kumar Ramadas, Saravan Shanmugavel
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Publication number: 20140179040Abstract: The present invention relates to a multilayer barrier film capable of encapsulating a moisture and/or oxygen sensitive electronic or optoelectronic device, the barrier film including at least one nanostructured layer including reactive nanoparticles capable of interacting with moisture and/or oxygen, the reactive nanoparticles being distributed within a polymeric binder, and at least one ultraviolet light neutralizing layer comprising a material capable of absorbing ultraviolet light, thereby limiting the transmission of ultraviolet light through the barrier film.Type: ApplicationFiled: December 13, 2013Publication date: June 26, 2014Applicant: Agency for Science, Technology and ResearchInventors: Senthil Kumar Ramadas, Soo Jin Chua, Lin Karen Ke
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Patent number: 8603825Abstract: A sensor for measuring gas permeability of a test material, comprising: an electrically conductive sensing element that comprises a water and/or oxygen sensitive material, wherein the reaction of said material with water or oxygen when the sensing element is contacted with water and/or oxygen results in a change in the electrical conductivity of the sensing element, and two electrodes electrically connected to the sensing element.Type: GrantFiled: March 31, 2004Date of Patent: December 10, 2013Assignee: Agency for Science, Technology and ResearchInventors: Soo Jin Chua, Senthil Kumar Ramadas, Xinbo He
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Publication number: 20120164434Abstract: The present invention refers to a multilayer barrier film comprising a substrate layer coated with a barrier layer, wherein the barrier layer is made of a material selected from the group consisting of a metal oxide, a metal carbide, a metal nitride and a metal oxynitride; a nanostructured metal compound layer arranged on the barrier layer; and a planarising layer arranged on the nanostructured layer, wherein the planarising layer comprises a nanostructured material which is distributed in a polymeric binder, wherein the nanostructured material is made of carbon, or a metal or a metal oxide or a mixture of the aforementioned substances. The present invention also refers to a method of obtaining those multilayer barrier films.Type: ApplicationFiled: June 2, 2010Publication date: June 28, 2012Inventors: Senthil Kumar Ramadas, Soo Jin Chua
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Publication number: 20110151173Abstract: The present invention refers to a graded barrier film comprising a layered structure, wherein the layered structure comprises a first layer consisting of metal oxide; an intermediate layer consisting of metal nitride or metal oxynitride which is arranged on the first layer; and a third layer consisting of a metal oxide which is arranged on the intermediate layer. The present invention further refers to a sputtering method for manufacturing this graded barrier film and a device encapsulated with this graded barrier film.Type: ApplicationFiled: April 28, 2009Publication date: June 23, 2011Applicant: AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCHInventors: Senthil Kumar Ramadas, Zin Ma Shwe
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Publication number: 20110132449Abstract: The present invention refers to a multilayer barrier film capable of encapsulating a moisture and/or oxygen sensitive electronic or optoelectronic device, the barrier film comprises at least one nanostructured layer comprising reactive nanoparticles capable of interacting with moisture and/or oxygen, the reactive nanoparticles being distributed within a polymeric binder, and at least one ultraviolet light neutralizing layer comprising a material capable of absorbing ultraviolet light, thereby limiting the transmission of ultraviolet light through the barrier filmType: ApplicationFiled: April 8, 2009Publication date: June 9, 2011Applicant: AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCHInventors: Senthil Kumar Ramadas, Soo Jin Chua, Lin Karen Ke
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Patent number: 7733008Abstract: An Organic Light Emitting Diode (OLED) which is adapted to inhibit the formation and growth of non-emissive areas known as “dark spots.” The OLED comprises an anode disposed on a substrate, a cathode, an electroluminescent (EL) layer disposed between the anode and the cathode and a hole transport layer disposed between the anode and the EL layer. The OLED has one or more dielectric organic barrier layers disposed between one or more of the OLED's layers. These barrier layers are made from an organic polymer and are adapted to resist permeation by oxygen and moisture and to inhibit metal migration.Type: GrantFiled: November 27, 2002Date of Patent: June 8, 2010Assignee: Agency for Science, Technology and ResearchInventors: Lin Ke, Senthil Kumar Ramadas, Soo Jin Chua
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Publication number: 20100089636Abstract: A barrier stack for encapsulating a moisture and/or oxygen sensitive electronic device is provided. The barrier stack comprises a multilayer film having at least one barrier layer having low moisture and/or oxygen permeability, and at least one sealing layer arranged to be in contact with a surface of the barrier layer, wherein the sealing material comprises reactive nanoparticles capable of interacting with moisture and/or oxygen, thereby retarding the permeation of moisture and/or oxygen through defects present in the barrier layer.Type: ApplicationFiled: November 6, 2006Publication date: April 15, 2010Inventors: Senthil Kumar Ramadas, Soo Jin Chua