Patents by Inventor Chakrapani Varanasi

Chakrapani Varanasi 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).

  • AC-tolerant HTS coated conductor with transposed filaments
    Patent number: 7756557
    Abstract: An AC-tolerant high temperature superconductor tape with transposed filaments having two layers of high temperature superconducting material with striations and corresponding filaments and an insulating layer positioned therebetween.
    Type: Grant
    Filed: November 30, 2006
    Date of Patent: July 13, 2010
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Paul N. Barnes, Milan Polak, Chakrapani Varanasi
  • Flux pinning enhancements in superconductive REBaCUO(REBCO) films and method of forming thereof
    Patent number: 7687436
    Abstract: Nanometer-sized non-superconducting particulates in superconductive REBCO films, where RE is a rare earth metal, for flux pinning enhancement and a method of forming are disclosed. A target with a second phase material sector portion and a superconductive material portion is used in a pulse laser deposition process to form films on substrates according to the present invention. The films consist of 10-20 nm-sized precipitates. In a 0.5 ?m thick film, a transport critical current density (Jc)>3 MA/cm2 at 77K in self-field was measured. In one embodiment, magnetization Jc at 77 K and 65K showed significant improvements in a composite YBCO films with fine precipitates produced according to the present invention as compared to non-doped (standard) YBCO films (>10 times increase at 9 T, 65 K).
    Type: Grant
    Filed: December 1, 2006
    Date of Patent: March 30, 2010
    Assignee: University of Dayton
    Inventors: Chakrapani Varanasi, Paul N. Barnes
  • FLUX PINNING ENHANCEMENTS IN SUPERCONDUCTIVE REBa2CU3O7-x (REBCO) FILMS AND METHOD OF FORMING THEREOF
    Publication number: 20070129255
    Abstract: Nanometer-sized non-superconducting particulates in superconductive REBCO films, where RE is a rare earth metal, for flux pinning enhancement and a method of forming are disclosed. A target with a second phase material sector portion and a superconductive material portion is used in a pulse laser deposition process to form films on substrates according to the present invention. The films consist of 10-20 nm-sized precipitates. In a 0.5 ?m thick film, a transport critical current density (Jc)>3 MA/cm2 at 77K in self-field was measured. In one embodiment, magnetization Jc at 77 K and 65K showed significant improvements in a composite YBCO films with fine precipitates produced according to the present invention as compared to non-doped (standard) YBCO films (>10 times increase at 9 T, 65 K).
    Type: Application
    Filed: December 1, 2006
    Publication date: June 7, 2007
    Applicant: University of Dayton
    Inventors: Chakrapani Varanasi, Paul Barnes