Patents by Inventor Ravi Prasad

Ravi Prasad 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).

  • Publication number: 20050276933
    Abstract: Embodiments of methods, apparatuses, devices, and/or systems to form a conductive structure are described.
    Type: Application
    Filed: June 14, 2004
    Publication date: December 15, 2005
    Inventors: Ravi Prasad, Jian-gang Weng
  • Publication number: 20050266154
    Abstract: Methods and apparatuses for forming components or circuits by ejecting a fluid including materials in a single ligament are disclosed.
    Type: Application
    Filed: May 26, 2004
    Publication date: December 1, 2005
    Inventors: John Devos, Daniel Blakley, Ravi Prasad, Olan Way, Jian-Gang Weng, Jeffrey Nielsen, Tony Cruz-Uribe
  • Publication number: 20050247978
    Abstract: One exemplary embodiment of the present disclosure includes a solution-processed thin film transistor having a number of a number of conductive solution-processed thin film contacts, semiconductor solution-processed thin film active regions, and dielectric solution-processed thin film isolations formed in a sequence and organization to form a solution-processed thin film structure. One or more of the semiconductor solution-processed thin film active regions and the dielectric solution-processed thin film isolations have been selectively ablated.
    Type: Application
    Filed: June 24, 2005
    Publication date: November 10, 2005
    Inventors: Jian-gang Weng, Ravi Prasad, Cary Addington, Man Cheung
  • Patent number: 6927108
    Abstract: An exemplary solution-processed thin film transistor formation method of the invention forms conductive solution-processed thin film material contacts, semiconductor solution-processed thin film material active regions, and dielectric solution-processed thin film material isolations in a sequence and organization to form a solution-processed thin film structure capable of transistor operation. During or after the formation of the transistor structure, laser ablation is applied to one or more of the conductive solution-processed thin film material contacts, the semiconductor solution-processed thin film material active regions and the dielectric solution-processed thin film material isolations to pattern or complete patterning of a material being selectively ablated.
    Type: Grant
    Filed: July 9, 2003
    Date of Patent: August 9, 2005
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Jian-gang Weng, Ravi Prasad, Cary G Addington, Man Ho Cheung
  • Patent number: 6924054
    Abstract: The present invention concerns a fuel supply for a fuel cell. The fuel supply includes a fuel storage area configured to hold a fuel solution, a fuel solution outlet configured to pass the fuel solution from the fuel storage area, a waste storage area, a waste inlet configured to pass waste into the waste storage area, and a movable barrier separating the fuel storage area and the waste storage area. The movable barrier is configured to move as fuel solution is passed from the fuel storage area and waste solution is passed into the waste storage area to simultaneously decrease the volume of the fuel storage area and increase the volume of the waste storage area.
    Type: Grant
    Filed: October 29, 2001
    Date of Patent: August 2, 2005
    Assignee: Hewlett-Packard Development Company L.P.
    Inventors: Ravi Prasad, Qin Liu, Loren E. Johnson, Michael L. Bullock, Winthrop D. Childers, L. Chris Mann, Joseph W. Tsang
  • Patent number: 6916362
    Abstract: An isolation device for one or more ion transport membranes and that has a housing and one or more check valves in communication with one or more passageways extending through the housing to prevent gas flow within the housing and the ion transport membrane(s) upon breakage thereof. Where a lance tube is used with the oxygen transport membrane a second check valve can be used. The check valves, preferably contain spring loaded poppet valves which, though normally open, are capable of resetting themselves into a closed position upon breakage or other failure of the oxygen transport membrane tubes.
    Type: Grant
    Filed: May 6, 2003
    Date of Patent: July 12, 2005
    Assignee: Praxair Technology, Inc.
    Inventors: Ravi Prasad, James Eric White
  • Publication number: 20050139067
    Abstract: A method of separating oxygen from an oxygen containing stream in which compressed and heated oxygen is introduced into cathode side of an oxygen transport membrane reactor. Oxygen is permeated from the cathode side to the anode side. Motive fluid that is introduced into an ejector draws an oxygen permeate containing stream from the anode side at a subatmospheric pressure to form an oxygen containing product stream. The motive fluid, which can be steam raised by combustion used in heating the reactor, can be separated from the oxygen containing product stream to form an oxygen product stream. The use of an ejector lowers the partial pressure of the oxygen at the anode side of the membrane reactor and therefore the degree to which the oxygen containing stream need be compressed.
    Type: Application
    Filed: December 30, 2003
    Publication date: June 30, 2005
    Inventors: Eric Shreiber, Bart van Hassel, Ravi Prasad
  • Patent number: 6881364
    Abstract: Polymer-ceramic mixed matrix compositions contain one or more organic polymers and a nano-sized dispersion of inorganic metal oxide particles which are dispersed throughout the composition. Materials have use in making membranes that act as transfer agents.
    Type: Grant
    Filed: May 15, 2002
    Date of Patent: April 19, 2005
    Assignee: U.S. Environmental Protection Agency
    Inventors: Leland Morris Vane, Ravi Prasad Ponangi
  • Publication number: 20050009248
    Abstract: An exemplary solution-processed thin film transistor formation method of the invention forms conductive solution-processed thin film material contacts, semiconductor solution-processed thin film material active regions, and dielectric solution-processed thin film material isolations in a sequence and organization to form a solution-processed thin film structure capable of transistor operation. During or after the formation of the transistor structure, laser ablation is applied to one or more of the conductive solution-processed thin film material contacts, the semiconductor solution-processed thin film material active regions and the dielectric solution-processed thin film material isolations to pattern or complete patterning of a material being selectively ablated.
    Type: Application
    Filed: July 9, 2003
    Publication date: January 13, 2005
    Inventors: Jian-gang Weng, Ravi Prasad, Cary Addington, Man Cheung
  • Publication number: 20040258966
    Abstract: Hydrogen generation system. A source of sodium borohydride is carried on a flexible substrate that moves from a feed roll to a takeup roll. A reaction among sodium borohydride, a catalyst and water evolves hydrogen and forms a by-product that is removed from the reaction area.
    Type: Application
    Filed: July 20, 2004
    Publication date: December 23, 2004
    Inventors: L. Chris Mann, Timothy J. Corbett, Qin Liu, Ravi Prasad
  • Publication number: 20040221722
    Abstract: An isolation device for one or more ion transport membranes and that has a housing and one or more check valves in communication with one or more passageways extending through the housing to prevent gas flow within the housing and the ion transport membrane(s) upon breakage thereof. Where a lance tube is used with the oxygen transport membrane a second check valve can be used. The check valves, preferably contain spring loaded poppet valves which, though normally open, are capable of resetting themselves into a closed position upon breakage or other failure of the oxygen transport membrane tubes.
    Type: Application
    Filed: May 6, 2003
    Publication date: November 11, 2004
    Inventors: Ravi Prasad, James Eric White
  • Publication number: 20040213922
    Abstract: A method of labeling an object includes selectively applying focused energy to thermally conductive pads on the object to create a label on the object. The conductive pads are disposed adjacent to a thermochromic layer.
    Type: Application
    Filed: April 22, 2003
    Publication date: October 28, 2004
    Inventors: Mitchell A. Abrams, Ravi Prasad
  • Publication number: 20040197626
    Abstract: A structure useful as a composite electrolyte for a fuel cell includes a metal film, a polymeric electrolyte material, and at least one hydrophilic layer disposed between the metal film and the polymeric electrolyte material, thereby promoting adhesion of the polymeric electrolyte material to the metal film. Methods for making and using the composite electrolyte, a fuel cell, and electronic devices are disclosed.
    Type: Application
    Filed: April 1, 2003
    Publication date: October 7, 2004
    Inventors: Yoocharn Jeon, Alfred I-Tsung Pan, Ravi Prasad
  • Patent number: 6790416
    Abstract: Hydrogen generation system. A source of sodium borohydride is carried on a flexible substrate that moves from a feed roll to a takeup roll. A reaction among sodium borohydride, a catalyst and water evolves hydrogen and forms a by-product that is removed from the reaction area.
    Type: Grant
    Filed: May 28, 2002
    Date of Patent: September 14, 2004
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: L. Chris Mann, Timothy J Corbett, Qin Liu, Ravi Prasad
  • Publication number: 20040086770
    Abstract: A fuel cell flow regulator includes a fuel cell fuel flow path, the fuel flow path including a solid-state material for regulating a flow of fuel along the fuel flow path by adsorption.
    Type: Application
    Filed: October 31, 2002
    Publication date: May 6, 2004
    Inventors: Paul H. McClelland, Philip Harding, Ravi Prasad
  • Publication number: 20040043173
    Abstract: A method for producing a coated polymeric article by co-extruding polypropylene and a maleic anhydride modified polypropylene, corona-treating, and applying a polysilicate barrier is described. Also provided are films and bottles produced using this method.
    Type: Application
    Filed: September 16, 2003
    Publication date: March 4, 2004
    Applicant: Hoechst Trespaphan GmbH
    Inventor: Ravi Prasad
  • Patent number: 6695983
    Abstract: A method of producing a crude syngas product stream or a syngas product stream by further processing of the crude syngas product stream. Both the crude and syngas product stream comprise carbon monoxide and hydrogen. The crude syngas product stream additionally comprises carbon dioxide and moisture. In accordance with the method, methane in a feed stream is converted into the hydrogen and carbon monoxide in at least two stages, thereby to form a crude syngas stream. An initial stage has an oxygen transport membrane reactor having a catalyst to promote carbon dioxide or steam methane reforming. Since, the conversion is shared between two stages, the oxygen transport membrane reactor can be operated at a sufficiently low temperature to avoid ceramic membrane deterioration due to creep effect. The subsequent stage can be operated at a higher temperature with more favorable equilibrium conditions to complete the conversion of the methane.
    Type: Grant
    Filed: April 24, 2001
    Date of Patent: February 24, 2004
    Assignees: Praxair Technology, Inc., BP Amoco Corp.
    Inventors: Ravi Prasad, Joseph Michael Schwartz, Earl T. Robinson, Christian Friedrich Gottzmann
  • Publication number: 20030234172
    Abstract: A fuel cell cartridge including a thermally-initiated hydrogen fuel source where the fuel cell cartridge is configured to receive radio frequency energy for thermally initiating the fuel source to produce hydrogen gas.
    Type: Application
    Filed: June 25, 2002
    Publication date: December 25, 2003
    Inventors: Alan R. Arthur, Ravi Prasad, John A. Devos, Philip Harding
  • Patent number: 6663235
    Abstract: In one embodiment of the invention, a structure for preventing ink shorting of conductors connected to a printhead is provided. The structure includes a layer of insulating material shaped to at least partially encapsulate the conductors on the printhead. The insulating material includes a first surface and a second surface, with each of the surfaces having an adhesive coated thereon. The adhesive includes a polymer of ethylene and glycidyl methacrylate. The adhesive may also further include an acrylic ester. Alternatively, a first adhesive may be coated onto a first surface of the insulating material or coverlayer and a second adhesive (distinct in composition from the first adhesive) may be coated onto a second surface of the insulating material or coverlayer. In another embodiment of the invention, a print cartridge for an inkjet printer, including the structure for preventing ink shorting of conductors connected to the printhead is provided.
    Type: Grant
    Filed: October 31, 2001
    Date of Patent: December 16, 2003
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: David L. Erickson, Gary J. Watts, Ravi Prasad
  • Publication number: 20030224229
    Abstract: Hydrogen generation system. A source of sodium borohydride is carried on a flexible substrate that moves from a feed roll to a takeup roll. A reaction among sodium borohydride, a catalyst and water evolves hydrogen and forms a by-product that is removed from the reaction area.
    Type: Application
    Filed: May 28, 2002
    Publication date: December 4, 2003
    Inventors: L. Chris Mann, Timothy J. Corbett, Qin Liu, Ravi Prasad