Patents by Inventor Ranjith Divigalpitiya

Ranjith Divigalpitiya 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: 11039579
    Abstract: A device includes a connected array of cells formed in a stack of flexible sheets. Each pair of adjacent sheets in the stack includes a first sheet and a second sheet bonded together at multiple bond locations. Each sheet has an electrically conductive layer disposed on an electrically non-conductive layer, the conductive layer comprising an electrically conductive non-metal material. Each pair of adjacent sheets in the stack is arranged so that the non-conductive layer of each first sheet is between the conductive layers of the first and second sheets. The cells of the array reversibly transition between an open state and a closed state in response to an electric potential having a magnitude greater than a threshold value applied between the conductive layers of the first and second sheets.
    Type: Grant
    Filed: November 16, 2018
    Date of Patent: June 22, 2021
    Assignee: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Ranjith Divigalpitiya, Lorne A. Whitehead
  • Patent number: 10834786
    Abstract: A heating tape comprises an insulated heating element that includes a heating element layer comprising a polymer composite having conductive particles and at least one set of conductive electrodes at least partially embedded in the polymer composite and extending along at least a substantial portion of the length of the heating tape. A heating tape system for a pipe or other surface, further includes a power ramp controller having a solid state relay component to regulate an in-rush of current to the heating element. The heating tape system also includes a connector having multiple contact points.
    Type: Grant
    Filed: January 11, 2017
    Date of Patent: November 10, 2020
    Assignee: 3M Innovative Properties Company
    Inventors: Jian Li, Paolo Rocca, Jonathan M. Cliffen, Ranjith Divigalpitiya, Frank A. Brandys, Anibal S. Sanchez-Garcia, Weixing Hou, David E. Livingstone, Raul P. Moraes
  • Publication number: 20200164401
    Abstract: A powder-rubbing apparatus comprises: a rotatable rubbing roll having a rotational axis; a substrate path; an oscillating mechanism for oscillating the rotatable rubbing roll along the rotational axis; and a powder coating die comprising an inlet port in fluid communication with an outlet port disposed adjacent to the substrate path. The substrate frictionally contacts the rotatable rubbing roll within a rubbing zone. A dispenser for dispensing gas-borne powder is in fluid communication with the inlet port of the powder coating die. The dispenser is aligned such that at least a portion of a gas-borne powder dispensed from the powder coating die is deposited directly onto at least one of the rotatable rubbing roll or the substrate and conveyed into the rubbing zone. A method of using the powder-rubbing apparatus and a powder-rubbed web preparable thereby are also disclosed.
    Type: Application
    Filed: July 24, 2018
    Publication date: May 28, 2020
    Inventors: James N. Dobbs, Karl K. Stensvad, Eric A. Vandre, Daniel H. Carlson, Ranjith Divigalpitiya, Gerrard A. S. Marra, Saurabh Batra, Satinder K. Nayar, Verlin W. Schelhaas, Chrispian E. Shelton, Samad Javid
  • Publication number: 20190174683
    Abstract: A device includes a connected array of cells formed in a stack of flexible sheets. Each pair of adjacent sheets in the stack includes a first sheet and a second sheet bonded together at multiple bond locations. Each sheet has an electrically conductive layer disposed on an electrically non-conductive layer, the conductive layer comprising an electrically conductive non-metal material. Each pair of adjacent sheets in the stack is arranged so that the non-conductive layer of each first sheet is between the conductive layers of the first and second sheets. The cells of the array reversibly transition between an open state and a closed state in response to an electric potential having a magnitude greater than a threshold value applied between the conductive layers of the first and second sheets.
    Type: Application
    Filed: November 16, 2018
    Publication date: June 13, 2019
    Inventors: Ranjith Divigalpitiya, Lorne A. Whitehead
  • Publication number: 20190008000
    Abstract: A heating tape comprises an insulated heating element that includes a heating element layer comprising a polymer composite having conductive particles and at least one set of conductive electrodes at least partially embedded in the polymer composite and extending along at least a substantial portion of the length of the heating tape. A heating tape system for a pipe or other surface, further includes a power ramp controller having a solid state relay component to regulate an in-rush of current to the heating element. The heating tape system also includes a connector having multiple contact points.
    Type: Application
    Filed: January 11, 2017
    Publication date: January 3, 2019
    Inventors: Jian Li, Paolo Rocca, Jonathan M. Cliffen, Ranjith Divigalpitiya, Frank A. Brandys, Anibal S. Sanchez-Garcia, Weixing Hou, David E. Livingstone, Raul P. Moraes
  • Patent number: 10041748
    Abstract: An article includes a substrate having a first major surface and optionally a second major surface. A layering arrangement is disposed on either or both of the first major surface and the second major surface. The layering arrangement includes a carbon layer and a conducting polymer layer.
    Type: Grant
    Filed: December 19, 2012
    Date of Patent: August 7, 2018
    Assignee: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Ranjith Divigalpitiya, Sabastine Ezugwu, Giovanni Fanchini
  • Publication number: 20180005767
    Abstract: Electrically-conductive articles are provided that include a current collector having a conductive coating. The current collector has nanoporous structure, such as that from etched metal, and a carbon coating in contact with the current collector. The carbon coating is free of binder. In some embodiments, the current collector includes etched aluminum. The provided electrically-conductive articles can be electrochemical capacitors or lithium-ion electrochemical cells.
    Type: Application
    Filed: September 13, 2017
    Publication date: January 4, 2018
    Inventor: Ranjith Divigalpitiya
  • Patent number: 9803284
    Abstract: A method comprises rubbing a powder comprising titanium dioxide particles against a surface of an aluminum substrate to form a layer bonded to the surface of the aluminum substrate. The powder comprises titanium dioxide and is essentially free of organic particles. Composite articles preparable by the method are also disclosed.
    Type: Grant
    Filed: April 23, 2014
    Date of Patent: October 31, 2017
    Assignee: 3M Innovative Properties Company
    Inventor: Ranjith Divigalpitiya
  • Patent number: 9668333
    Abstract: A transparent conductive article includes a transparent substrate, a thin electrically conductive grid, and a carbon nanolayer. The grid is disposed on the substrate, and the carbon nanolayer is also disposed on the substrate and in contact with the grid. The conductive grid and the carbon nanolayer may have thicknesses of no more than 1 micron and 50 nanometers, respectively. The carbon nanolayer has a morphology that includes graphite platelets embedded in nano-crystalline carbon, and can be produced with a buffing procedure using dry carbon particles without substantially damaging the grid structure. The article may have a visible light transmission of at least 80%, and a sheet resistance less than 500 or 100 ohms/square. The transparent substrate may comprise a flexible polymer film. The disclosed articles may substantially maintain an initial sheet resistance value when subjected to flexing.
    Type: Grant
    Filed: December 12, 2012
    Date of Patent: May 30, 2017
    Assignee: 3M Innovative Properties Company
    Inventors: Ranjith Divigalpitiya, Mark J. Pellerite, John P. Baetzold, Gary A. Korba, Mieczyslaw H. Mazurek
  • Publication number: 20170051185
    Abstract: Multi-layer cover tape constructions include a polymeric substrate with a low adhesion backsize coating layer on one surface and an adhesive layer on the other surface, with a conductive film construction adhered to a portion of the adhesive layer such that portions of the adhesive remain exposed. The conductive film construction includes a polymeric substrate with an exposed layer of abrasion-resistant, electrically conductive nano-scale graphite coated by buff coating. Other multi-layer cover tape constructions include a polymeric substrate with a low adhesion backsize coating layer on one surface, and an exposed layer of abrasion-resistant, electrically conductive nano-scale graphite particles coated on the other surface. Stripes of adhesive are present on a portion of the electrically conductive coating such that portions of the electrically conductive coating remain exposed between the adhesive stripes.
    Type: Application
    Filed: February 12, 2015
    Publication date: February 23, 2017
    Inventors: Shiow Shya Ling, Ranjith Divigalpitiya, Kam Poi Chia, Carol A. Marek, Gerrard A. Marra
  • Publication number: 20170029280
    Abstract: A method of producing an aqueous dispersion of few-layer graphene nanosheets is disclosed, the method including: (a) mixing graphite particles with a perfluorosulfonate ionomer in an aqueous liquid, to form an aqueous dispersion of graphite particles; and (b) sonicating the aqueous dispersion of graphite particles to form an aqueous dispersion of few-layer graphene nanosheets, wherein the perfluorosulfonate ionomer is disposed as a thin and continuous layer on the few-layer graphene nanosheets. A composition is also disclosed, comprising an aqueous dispersion of a mixture of: (a) a perfluorosulfonate ionomer; and (b) a plurality of few-layer graphene nanosheets; wherein the perfluorosulfonate ionomer is disposed as a thin and continuous layer on the few-layer graphene nanosheets.
    Type: Application
    Filed: December 11, 2014
    Publication date: February 2, 2017
    Inventors: David Julius, Melvin Zin, Ranjith Divigalpitiya, Gary A. Korba
  • Publication number: 20160200098
    Abstract: Article having a first single, discrete atomic, dry layer of a first weakly bonded crystalline material on at least a surface of a substrate. Embodiments of the articles are useful, for example, in automotive under-the-hood parts exposed to chemicals and extreme temperatures.
    Type: Application
    Filed: March 21, 2016
    Publication date: July 14, 2016
    Inventors: Arokiaraj Jesudoss, Ranjith Divigalpitiya, Gary A. Korba, Boon Kiat Lim, Melvin T. Zin
  • Patent number: 9321254
    Abstract: Article having a first single, discrete atomic, dry layer of a first weakly bonded crystalline material on at least a surface of a substrate. Embodiments of the articles are useful, for example, in automotive under-the-hood parts exposed to chemicals and extreme temperatures.
    Type: Grant
    Filed: December 2, 2011
    Date of Patent: April 26, 2016
    Assignee: 3M Innovative Properties Company
    Inventors: Arokiaraj Jesudoss, Ranjith Divigalpitiya, Gary A. Korba, Boon Kiat Lim, Melvin T. Zin
  • Publication number: 20160076151
    Abstract: A method comprises rubbing a powder comprising titanium dioxide particles against a surface of an aluminum substrate to form a layer bonded to the surface of the aluminum substrate. The powder comprises titanium dioxide and is essentially free of organic particles. Composite articles preparable by the method are also disclosed.
    Type: Application
    Filed: April 23, 2014
    Publication date: March 17, 2016
    Inventor: Ranjith Divigalpitiya
  • Publication number: 20150333424
    Abstract: An electrical connector includes a contact for making electrical connection with a corresponding contact of a mating connector. The electrical connector further includes a carbon layer disposed on a contact surface of the contact. The carbon layer has a morphology comprising graphite platelets embedded in nano-crystalline carbon.
    Type: Application
    Filed: December 12, 2013
    Publication date: November 19, 2015
    Inventors: Cheryl L. S. Elsbernd, Ranjith Divigalpitiya, Gary A. Korba
  • Patent number: 9172085
    Abstract: Current collectors and methods are provided that relate to electrodes that are useful in electrochemical cells. The provided current collectors include a metallic substrate, a substantially uniform nano-scale carbon coating, and an active electrode material. The coating has a maximum thickness of less than about 200 nanometers.
    Type: Grant
    Filed: July 1, 2014
    Date of Patent: October 27, 2015
    Assignee: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Ranjith Divigalpitiya, Mary I. Buckett
  • Publication number: 20150118457
    Abstract: A method of forming an article is provided. The method can include providing a substrate comprising a surface. The method can further include forming a solvent soluble layer on or over the surface of the substrate in a pattern, the pattern defining one or more first portions of the surface that are overlaid by the solvent soluble layer, and one or more second portions of the surface that are free of the solvent soluble layer. The method can further include forming a second layer on or over at least one of the first portions and at least one of the second portions, wherein the step of forming the second layer includes buffing an exfoliatable material on or over at least one of the first portions and at least one of the second portions. The method can further include removing the solvent soluble layer by applying a solvent to the substrate.
    Type: Application
    Filed: June 10, 2013
    Publication date: April 30, 2015
    Inventors: Ranjith Divigalpitiya, Mikhail L. Pekurovsky, Shawn C. Dodds
  • Publication number: 20140329082
    Abstract: An article includes a substrate having a first major surface and optionally a second major surface. A layering arrangement is disposed on either or both of the first major surface and the second major surface. The layering arrangement includes a carbon layer and a conducting polymer layer.
    Type: Application
    Filed: December 19, 2012
    Publication date: November 6, 2014
    Inventors: Ranjith Divigalpitiya, Sabastine Ezugwu, Giovanni Fanchini
  • Publication number: 20140315088
    Abstract: Current collectors and methods are provided that relate to electrodes that are useful in electrochemical cells. The provided current collectors include a metallic substrate, a substantially uniform nano-scale carbon coating, and an active electrode material. The coating has a maximum thickness of less than about 200 nanometers.
    Type: Application
    Filed: July 1, 2014
    Publication date: October 23, 2014
    Inventors: Ranjith Divigalpitiya, Mary I. Buckett
  • Publication number: 20140302397
    Abstract: A method of forming an electrode for a lithium-ion battery. The method includes providing a metallic substrate and coating the metallic substrate with a substantially solvent free electroactive coating composition. Coating the metallic substrate includes buffing the electroactive coating composition onto a major surface of the metallic substrate.
    Type: Application
    Filed: December 13, 2012
    Publication date: October 9, 2014
    Applicant: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Andrew T. J. van Bommel, Ranjith Divigalpitiya