Patents by Inventor Rajat Sharma

Rajat Sharma 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: 20150304946
    Abstract: Methods and apparatus are described for performing cell selection for reducing an initial acquisition time between a user equipment (UE) and a network entity, comprising measuring a signal from a cell, the signal including at least one system information block (SIB), wherein the at least one SIB includes a plurality of cell selection threshold values; attempting to decode the at least one SIB; determining, in response to successfully decoding the at least one SIB, whether one or more measurements of the signal pass or fail a cell selection criteria check that includes the plurality of cell selection threshold values; determining, in response to the cell selection criteria check failing, whether the plurality of cell selection threshold values are within range of a plurality of corresponding minimum network threshold values; and performing a cell selection procedure on the cell in response to determining that the plurality of cell selection threshold values are within range of the plurality of corresponding mi
    Type: Application
    Filed: October 27, 2014
    Publication date: October 22, 2015
    Inventors: Sagar Bharatkumar SHAH, Chulong CHEN, Nate CHIZGI, Je Woo KIM, Sharif Ahsanul MATIN, Rajat SHARMA
  • Patent number: 9105806
    Abstract: A GaN based light emitting diode device which emits polarized light or light of various degrees of polarization for use in the creation of optical devices. The die are cut to different shapes, or contain some indicia that are used to represent the configuration of the weak dipole plane and the strong dipole plane. This allows for the more efficient manufacturing of such light emitting diode based optical devices.
    Type: Grant
    Filed: July 19, 2012
    Date of Patent: August 11, 2015
    Assignees: SORAA, INC., KAAI, INC.
    Inventors: Rajat Sharma, Eric M. Hall
  • Publication number: 20150207032
    Abstract: Embodiments of the present disclosures are directed to improved approaches for achieving high-performance light extraction from a Group III-nitride volumetric LED chips. More particularly, disclosed herein are techniques for achieving high-performance light extraction from a Group III-nitride volumetric LED chip using surface and sidewall roughening.
    Type: Application
    Filed: February 26, 2015
    Publication date: July 23, 2015
    Inventors: RAFAEL ALDAZ, AURELIEN J.F. DAVID, DANIEL F. FEEZELL, THOMAS M. KATONA, RAJAT SHARMA
  • Patent number: 9071039
    Abstract: An optical device includes a gallium nitride substrate member having an m-plane nonpolar crystalline surface region characterized by an orientation of about ?1 degree towards (000-1) and less than about +/?0.3 degrees towards (11-20). The device also has a laser stripe region formed overlying a portion of the m-plane nonpolar crystalline orientation surface region. In a preferred embodiment, the laser stripe region is characterized by a cavity orientation that is substantially parallel to the c-direction, the laser stripe region having a first end and a second end. The device includes a first cleaved c-face facet, which is coated, provided on the first end of the laser stripe region. The device also has a second cleaved c-face facet, which is exposed, provided on the second end of the laser stripe region.
    Type: Grant
    Filed: December 19, 2013
    Date of Patent: June 30, 2015
    Assignee: Soraa Laser Diode, Inc.
    Inventors: James W. Raring, Daniel F. Feezell, Nicholas J. Pfister, Rajat Sharma, Mathew C. Schmidt, Christiane Poblenz Elsass, Yu-Chia Chang
  • Publication number: 20150139000
    Abstract: CQI is enhanced in fast fading and/or poor RF scenarios. For example, in the event a fast fading condition and/or a poor RF condition is detected at a UE, a CQI value is increased by a defined delta. The UE reports this higher CQI value to a serving access point (e.g., base station) as long as the channel condition prevails this way such that a corresponding increase in throughput may subsequently be seen at the UE.
    Type: Application
    Filed: June 6, 2014
    Publication date: May 21, 2015
    Inventors: Sharif Ahsanul Matin, Jimmy Chi-Wai Chui, Je Woo Kim, Sagar Bharatkumar Shah, Rajat Sharma, Aashish Poudel
  • Patent number: 9000466
    Abstract: Embodiments of the present disclosures are directed to improved approaches for achieving high-performance light extraction from a Group III-nitride volumetric LED chips. More particularly, disclosed herein are techniques for achieving high-performance light extraction from a Group III-nitride volumetric LED chip using surface and sidewall roughening.
    Type: Grant
    Filed: February 28, 2013
    Date of Patent: April 7, 2015
    Assignee: Soraa, Inc.
    Inventors: Rafael Aldaz, Aurelien David, Daniel F. Feezell, Thomas M. Katona, Rajat Sharma
  • Publication number: 20140295595
    Abstract: An optical device includes a gallium nitride substrate member having an m-plane nonpolar crystalline surface region characterized by an orientation of about ?1 degree towards (000-1) and less than about +/?0.3 degrees towards (11-20). The device also has a laser stripe region formed overlying a portion of the m-plane nonpolar crystalline orientation surface region. In a preferred embodiment, the laser stripe region is characterized by a cavity orientation that is substantially parallel to the c-direction, the laser stripe region having a first end and a second end. The device includes a first cleaved c-face facet, which is coated, provided on the first end of the laser stripe region. The device also has a second cleaved c-face facet, which is exposed, provided on the second end of the laser stripe region.
    Type: Application
    Filed: December 19, 2013
    Publication date: October 2, 2014
    Applicant: Soraa Laser Diode, Inc.
    Inventors: James W. Raring, Daniel F. Feezell, Nicholas J. Pfister, Rajat Sharma, Mathew C. Schmidt, Christiane Poblenz Elsass, Yu-Chia Chang
  • Publication number: 20140211820
    Abstract: A method for growth and fabrication of semipolar (Ga,Al,In,B)N thin films, heterostructures, and devices, comprising identifying desired material properties for a particular device application, selecting a semipolar growth orientation based on the desired material properties, selecting a suitable substrate for growth of the selected semipolar growth orientation, growing a planar semipolar (Ga,Al,In,B)N template or nucleation layer on the substrate, and growing the semipolar (Ga,Al,In,B)N thin films, heterostructures or devices on the planar semipolar (Ga,Al,In,B)N template or nucleation layer. The method results in a large area of the semipolar (Ga,Al,In,B)N thin films, heterostructures, and devices being parallel to the substrate surface.
    Type: Application
    Filed: March 28, 2014
    Publication date: July 31, 2014
    Applicants: Japan Science and Technology Agency, The Regents of the University of California
    Inventors: Robert M. Farrell, JR., Troy J. Baker, Arpan Chakraborty, Benjamin A. Haskell, P. Morgan Pattison, Rajat Sharma, Umesh K. Mishra, Steven P. DenBaars, James S. Speck, Shuji Nakamura
  • Patent number: 8791499
    Abstract: An improved laser light emitting diode. The device has a gallium nitride substrate structure, which includes a surface region. The device also has an epitaxial layer overlying the surface region and a p-n junction formed within a portion of the epitaxial layer. In a preferred embodiment, the device also has one or more plane or line defects spatially configured in a manner to be free from intersecting the p-n junction, the one or more plane or line defects being at least 1×106 cm?2.
    Type: Grant
    Filed: May 24, 2010
    Date of Patent: July 29, 2014
    Assignee: Soraa, Inc.
    Inventors: Rajat Sharma, Eric M. Hall
  • Patent number: 8686466
    Abstract: A method for growth and fabrication of semipolar (Ga, Al, In, B)N thin films, heterostructures, and devices, comprising identifying desired material properties for a particular device application, selecting a semipolar growth orientation based on the desired material properties, selecting a suitable substrate for growth of the selected semipolar growth orientation, growing a planar semipolar (Ga, Al, In, B)N template or nucleation layer on the substrate, and growing the semipolar (Ga, Al, In, B)N thin films, heterostructures or devices on the planar semipolar (Ga, Al, In, B)N template or nucleation layer. The method results in a large area of the semipolar (Ga, Al, In, B)N thin films, heterostructures, and devices being parallel to the substrate surface.
    Type: Grant
    Filed: November 23, 2010
    Date of Patent: April 1, 2014
    Assignees: The Regents of the University of California, Japan Science and Technology Agency
    Inventors: Robert M. Farrell, Jr., Troy J. Baker, Arpan Chakraborty, Benjamin A. Haskell, P. Morgan Pattison, Rajat Sharma, Umesh K. Mishra, Steven P. DenBaars, James S. Speck, Shuji Nakamura
  • Patent number: 8643036
    Abstract: A semiconductor light-emitting diode, and method of fabricating same, wherein an indium (In)-containing light-emitting layer, as well as subsequent device layers, is deposited on a textured surface. The resulting device is a phosphor-free white light source.
    Type: Grant
    Filed: July 16, 2012
    Date of Patent: February 4, 2014
    Assignee: The Regents of the University of California
    Inventors: Rajat Sharma, Paul Morgan Pattison, John Francis Kaeding, Shuji Nakamura
  • Patent number: 8634442
    Abstract: An optical device includes a gallium nitride substrate member having an m-plane nonpolar crystalline surface region characterized by an orientation of about ?1 degree towards (000-1) and less than about +/?0.3 degrees towards (11-20). The device also has a laser stripe region formed overlying a portion of the m-plane nonpolar crystalline orientation surface region. In a preferred embodiment, the laser stripe region is characterized by a cavity orientation that is substantially parallel to the c-direction, the laser stripe region having a first end and a second end. The device includes a first cleaved c-face facet, which is coated, provided on the first end of the laser stripe region. The device also has a second cleaved c-face facet, which is exposed, provided on the second end of the laser stripe region.
    Type: Grant
    Filed: August 25, 2010
    Date of Patent: January 21, 2014
    Assignee: Soraa Laser Diode, Inc.
    Inventors: James W. Raring, Daniel F. Feezell, Nicholas J. Pfister, Rajat Sharma, Mathew C. Schmidt, Christiane Poblenz, Yu-Chia Chang
  • Patent number: 8618560
    Abstract: A light emitting device includes a substrate having a surface region and a light emitting diode overlying the surface region. The light emitting diode is fabricated on a semipolar or nonpolar GaN containing substrate and emits electromagnetic radiation of a first wavelength. The diode includes a quantum well region characterized by an electron wave function and a hole wave function. The electron wave function and the hole wave function are substantially overlapped within a predetermined spatial region of the quantum well region. The device has a transparent phosphor overlying the light emitting diode. The phosphor is excited by the substantially polarized emission to emit electromagnetic radiation of a second wavelength.
    Type: Grant
    Filed: September 20, 2012
    Date of Patent: December 31, 2013
    Assignee: Soraa, Inc.
    Inventors: Mark P. D'Evelyn, Rajat Sharma, Eric M. Hall, Daniel F. Feezell
  • Patent number: 8494017
    Abstract: An edge emitting solid state laser and method. The laser comprises at least one AlInGaN active layer on a bulk GaN substrate with a non-polar or semi-polar orientation. The edges of the laser comprise {1 1?2±6} facets. The laser has high gain, low threshold currents, capability for extended operation at high current densities, and can be manufactured with improved yield. The laser is useful for optical data storage, projection displays, and as a source for general illumination.
    Type: Grant
    Filed: September 7, 2012
    Date of Patent: July 23, 2013
    Assignee: Soraa, Inc.
    Inventors: Rajat Sharma, Eric M. Hall, Christiane Poblenz, Mark P. D'Evelyn
  • Patent number: 8455894
    Abstract: A high efficiency photonic-crystal light emitting diode comprises a flip-chipped stack of AlxInyGa1-x-yN layers, where 0?x, y, x+y?1. Each layer has a high crystalline quality, with a dislocation density below about 105 cm?2. The backside of the stack, exposed by removal of the original substrate, has a photonic crystal pattern for improved light extraction.
    Type: Grant
    Filed: September 29, 2009
    Date of Patent: June 4, 2013
    Assignee: SORAA, Inc.
    Inventors: Mark P. D'Evelyn, Rajat Sharma, Eric M. Hall
  • Publication number: 20130064261
    Abstract: An edge emitting solid state laser and method. The laser comprises at least one AlInGaN active layer on a bulk GaN substrate with a non-polar or semi-polar orientation. The edges of the laser comprise {1 1?2±6} facets. The laser has high gain, low threshold currents, capability for extended operation at high current densities, and can be manufactured with improved yield. The laser is useful for optical data storage, projection displays, and as a source for general illumination.
    Type: Application
    Filed: September 7, 2012
    Publication date: March 14, 2013
    Applicant: Soraa, Inc.
    Inventors: Rajat Sharma, Eric M. Hall, Christiane Poblenz, Mark P. D'Evelyn
  • Publication number: 20130026483
    Abstract: A gallium and nitrogen containing optical device has a base region and no more than three major planar side regions configured in a triangular arrangement provided from the base region.
    Type: Application
    Filed: January 24, 2012
    Publication date: January 31, 2013
    Applicant: Soraa, Inc.
    Inventors: Rajat Sharma, Andrew Felker
  • Patent number: D720310
    Type: Grant
    Filed: December 12, 2012
    Date of Patent: December 30, 2014
    Assignee: Soraa, Inc.
    Inventors: Rajat Sharma, Andrew Felker
  • Patent number: D739363
    Type: Grant
    Filed: December 31, 2012
    Date of Patent: September 22, 2015
    Assignee: Soraa, Inc.
    Inventors: Rajat Sharma, Andrew Felker, William D. Houck
  • Patent number: D743356
    Type: Grant
    Filed: January 11, 2013
    Date of Patent: November 17, 2015
    Assignee: Soraa, Inc.
    Inventors: Rajat Sharma, Andrew Felker, William D. Houck