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).

  • Patent number: 10745795
    Abstract: 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: Grant
    Filed: April 28, 2009
    Date of Patent: August 18, 2020
    Assignee: Agency for Science, Technology and Research
    Inventors: Senthil Kumar Ramadas, Zin Ma Shwe
  • Publication number: 20190027414
    Abstract: 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: Application
    Filed: September 24, 2018
    Publication date: January 24, 2019
    Applicants: Agency for Science, Technology and Research, Tera-Barrier Films PTE LTD.
    Inventors: Senthil Kumar Ramadas, Saravanan Shanmugavel
  • Patent number: 10103359
    Abstract: 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: Grant
    Filed: April 8, 2009
    Date of Patent: October 16, 2018
    Assignee: AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCH
    Inventors: Senthil Kumar Ramadas, Soo Jin Chua, Lin Karen Ke
  • Patent number: 9799854
    Abstract: 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: Grant
    Filed: December 13, 2013
    Date of Patent: October 24, 2017
    Assignee: AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCH
    Inventors: Senthil Kumar Ramadas, Soo Jin Chua, Lin Karen Ke
  • Publication number: 20170098799
    Abstract: 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: Application
    Filed: October 7, 2016
    Publication date: April 6, 2017
    Inventors: Senthil Kumar RAMADAS, Soo Jin CHUA
  • Patent number: 9493348
    Abstract: 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: Grant
    Filed: November 6, 2006
    Date of Patent: November 15, 2016
    Assignee: Agency for Science, Technology and Research
    Inventors: Senthil Kumar Ramadas, Soo Jin Chua
  • Publication number: 20160088756
    Abstract: 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: Application
    Filed: May 2, 2014
    Publication date: March 24, 2016
    Inventor: Senthil Kumar RAMADAS
  • Publication number: 20150314941
    Abstract: 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: Application
    Filed: October 18, 2013
    Publication date: November 5, 2015
    Inventors: Senthil Kumar RAMADAS, Saravan SHANMUGAVEL
  • Publication number: 20140252342
    Abstract: 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: Application
    Filed: October 24, 2012
    Publication date: September 11, 2014
    Applicant: AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCH
    Inventors: Senthil Kumar Ramadas, Saravan Shanmugavel
  • Publication number: 20140179040
    Abstract: 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: Application
    Filed: December 13, 2013
    Publication date: June 26, 2014
    Applicant: Agency for Science, Technology and Research
    Inventors: Senthil Kumar Ramadas, Soo Jin Chua, Lin Karen Ke
  • Patent number: 8603825
    Abstract: 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: Grant
    Filed: March 31, 2004
    Date of Patent: December 10, 2013
    Assignee: Agency for Science, Technology and Research
    Inventors: Soo Jin Chua, Senthil Kumar Ramadas, Xinbo He
  • Publication number: 20120164434
    Abstract: 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: Application
    Filed: June 2, 2010
    Publication date: June 28, 2012
    Inventors: Senthil Kumar Ramadas, Soo Jin Chua
  • Publication number: 20110151173
    Abstract: 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: Application
    Filed: April 28, 2009
    Publication date: June 23, 2011
    Applicant: AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCH
    Inventors: Senthil Kumar Ramadas, Zin Ma Shwe
  • Publication number: 20110132449
    Abstract: 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: Application
    Filed: April 8, 2009
    Publication date: June 9, 2011
    Applicant: AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCH
    Inventors: Senthil Kumar Ramadas, Soo Jin Chua, Lin Karen Ke
  • Patent number: 7733008
    Abstract: 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: Grant
    Filed: November 27, 2002
    Date of Patent: June 8, 2010
    Assignee: Agency for Science, Technology and Research
    Inventors: Lin Ke, Senthil Kumar Ramadas, Soo Jin Chua
  • Publication number: 20100089636
    Abstract: 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: Application
    Filed: November 6, 2006
    Publication date: April 15, 2010
    Inventors: Senthil Kumar Ramadas, Soo Jin Chua