Patents by Inventor David Ernest Rodrigues

David Ernest Rodrigues 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: 20130209308
    Abstract: A method of making a nanoscale metallic powder is disclosed. The method includes providing a base material comprising a metallic compound, wherein the base material is configured for chemical reduction by a reductant to form a metallic material. The method also includes forming a powder of the base material, the powder comprising a plurality of powder particles, the powder particles having an average particle size that is less than about 1 micron. The method further includes disposing the powder particles into a reactor together with the reductant under an environmental condition that promotes the chemical reduction of the base material and formation of a plurality of particles of the metallic material.
    Type: Application
    Filed: February 15, 2012
    Publication date: August 15, 2013
    Applicant: Baker Hughes Incorporated
    Inventors: Oleg A. Mazyar, Michael H. Johnson, David Ernest Rodrigues
  • Patent number: 6706248
    Abstract: Carbon-nitrogen nanofibers are prepared by contacting a gaseous mixture comprising hydrogen and a carbon-nitrogen compound such as pyridine with a cobalt-iron catalyst at a temperature in the range of about 500-1000° C. The nanofibers are characterized by a structure in which layers emanate from a core catalyst particle and are parallel to each other but not parallel to the length axis of the nanofibers.
    Type: Grant
    Filed: March 19, 2001
    Date of Patent: March 16, 2004
    Assignee: General Electric Company
    Inventor: David Ernest Rodrigues
  • Patent number: 6599446
    Abstract: Inclusion of relatively small amounts of organic ionic species, such as calcium stearate, in the preparation of an electrically conductive polymer composite composition provides a composition having enhanced electrical properties relative to the composite composition lacking the added organic ionic species. As a result of this enhancement, normally insulating materials which rely upon a conductive filler to render them electrically conductive, can be made to achieve a given level of conductivity using less of the conductive filler than would otherwise be required. As a result, the adverse effects of the conductive filler on the polymer's physical properties can be minimized while maintaining a high level of electrical conductivity.
    Type: Grant
    Filed: November 3, 2000
    Date of Patent: July 29, 2003
    Assignee: General Electric Company
    Inventors: Michael Leslie Todt, David Ernest Rodrigues, Sai-Pei Ting
  • Publication number: 20010037013
    Abstract: Doped polyanilines are prepared by contacting aniline with an oxidizing agent such as ammonium peroxydisulfate in aqueous solution at a temperature of at most about 10° C. in the presence of at least one organic sulfonic acid, preferably an alkylbenzenesulfonic acid such as dodecylbenzenesulfonic acid.
    Type: Application
    Filed: March 30, 2001
    Publication date: November 1, 2001
    Inventors: Sundeep Kumar Dhawan, Subhas Chandra, Erode Subramanium Raja Gopal, Navjot Singh, David Ernest Rodrigues, Michael Leslie Todt, James Ross Fishburn
  • Publication number: 20010031854
    Abstract: Doped polyanilines are prepared by contacting aniline with an oxidizing agent such as ammonium peroxydisulfate in aqueous solution at a temperature of at most about 10° C. in the presence of at least one organic sulfonic acid, preferably an alkylbenzenesulfonic acid such as dodecylbenzenesulfonic acid.
    Type: Application
    Filed: March 30, 2001
    Publication date: October 18, 2001
    Inventors: Sundeep Kumar Dhawan, Subhas Chandra, Erode Subramanium Raja Gopal, Navjot Singh, David Ernest Rodrigues, Michael Leslie Todt, James Ross Fishburn
  • Patent number: 6277952
    Abstract: Doped polyanilines are prepared by contacting aniline with an oxidizing agent such as ammonium peroxydisulfate in aqueous solution at a temperature of at most about 10° C. in the presence of at least one organic sulfonic acid, preferably an alkylbenzenesulfonic acid such as dodecylbenzenesulfonic acid. The products may be blended with thermoplastic resins such as polystyrene to produce blends having excellent static discharge properties.
    Type: Grant
    Filed: November 15, 1999
    Date of Patent: August 21, 2001
    Assignee: General Electric Company
    Inventors: Sundeep Kumar Dhawan, David Ernest Rodrigues