Patents by Inventor Umesh K

Umesh K 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: 10529892
    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: September 7, 2017
    Date of Patent: January 7, 2020
    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
  • Publication number: 20190348532
    Abstract: A novel design for a nitrogen polar high-electron-mobility transistor (HEMT) structure comprising a GaN/InGaN composite channel. As A novel design for a nitrogen polar high-electron-mobility transistor (HEMT) structure comprising a GaN/InGaN composite channel. As illustrated herein, a thin InGaN layer introduced in the channel increases the carrier density, reduces the electric field in the channel, and increases the carrier mobility. The dependence of p on InGaN thickness (tInGaN) and indium composition (xIn) was investigated for different channel thicknesses. With optimized tInGaN and xIn, significant improvements in electron mobility were observed. For a 6 nm channel HEMT, the electron mobility increased from 606 to 1141 cm2/(V·s) when the 6 nm thick pure GaN channel was replaced by the 4 nm GaN/2 nm In0.1Ga0.9N composite channel.
    Type: Application
    Filed: November 16, 2017
    Publication date: November 14, 2019
    Applicant: The Regents of the University of California
    Inventors: Brian Romanczyk, Haoran Li, Elaheh Ahmadi, Steven Wienecke, Matthew Guidry, Xun Zheng, Stacia Keller, Umesh K. Mishra
  • Publication number: 20190181329
    Abstract: An optoelectronic or electronic device structure, including an active region on or above a polar substrate, wherein the active region comprises a polar p region. The device structure further includes a hole supply region on or above the active region. Holes in the hole supply region are driven by a field into the active region, the field arising at least in part due to a piezoelectric and/or spontaneous polarization field generated by a composition and grading of the active region.
    Type: Application
    Filed: April 11, 2017
    Publication date: June 13, 2019
    Inventors: Yuuki Enatsu, Chirag Gupta, Stacia Keller, Umesh K. Mishra, Anchal Agarwal
  • Patent number: 10312361
    Abstract: Trenched vertical power field-effect transistors with improved on-resistance and/or breakdown voltage are fabricated. In one or more embodiments, the modulation of the current flow of the transistor occurs in the lateral channel, whereas the voltage is predominantly held in the vertical direction in the off-state. When the device is in the on-state, the current is channeled through an aperture in a current-blocking region after it flows under a gate region into the drift region. In another embodiment, a novel vertical power low-loss semiconductor multi-junction device in III-nitride and non-III-nitride material system is provided. One or more multi-junction device embodiments aim at providing enhancement mode (normally-off) operation alongside ultra-low on resistance and high breakdown voltage.
    Type: Grant
    Filed: November 4, 2016
    Date of Patent: June 4, 2019
    Assignee: The Regents of the University of California
    Inventors: Srabanti Chowdhury, Jeonghee Kim, Chirag Gupta, Stacia Keller, Silvia H. Chan, Umesh K. Mishra
  • Patent number: 10136306
    Abstract: Generating and using a device-type specific preferred public land mobile network (PLMN) list for roaming PLMN selection. Wireless devices sharing one or more common characteristics may be tasked with collecting roaming PLMN selection data. That data may be collected and used to generate a preferred PLMN list specific to wireless devices sharing those common characteristics. The preferred PLMN list may be distributed to wireless devices sharing those common characteristics, which may then use it in conjunction with roaming PLMN selection.
    Type: Grant
    Filed: May 3, 2017
    Date of Patent: November 20, 2018
    Assignee: Apple Inc.
    Inventors: Qin Zhang, Madhusudan Chaudhary, Longda Xing, Umesh K. Shukla, Bo Wang, Zhiwei Wang, Yaoqi Yan, Qiang Miao
  • Patent number: 10104589
    Abstract: Described herein are apparatus, systems and methods for opportunistic system selection and reselection to avoid jammer desense intermodulation distortion. A method may comprise, at a user equipment (“UE”), identifying a list of frequencies and bands available to a cellular modem of the UE for one of system selection and system reselection, identifying a subset of the list of frequencies and bands based on an operation of a non-cellular wireless communication component of the UE, storing the subset of the list of frequencies and bands in a graylist, and performing, by the cellular modem, a search for one of the system selection and the system reselection based on the graylist.
    Type: Grant
    Filed: April 5, 2016
    Date of Patent: October 16, 2018
    Assignee: APPLE INC.
    Inventors: Harsha Shirahatti, Umesh K Shukla
  • Patent number: 10091669
    Abstract: Methods and apparatus for reducing voice call drop rate are disclosed. Existing devices do not account for the added burden of background services on voice calls. Specifically, multi-RAB scenarios (e.g., a voice call and background services) can experience significant reduction in call quality. Accordingly, in one exemplary embodiment, background services that are not time-critical and/or application-critical can be suspended while a voice call is in progress. By suspending background traffic during a call, the device can avoid unnecessary multi-RAB voice call operation, which significantly improves overall network operation and user experience.
    Type: Grant
    Filed: February 1, 2016
    Date of Patent: October 2, 2018
    Assignee: Apple Inc.
    Inventors: Umesh K. Shukla, Sachin J. Sane
  • Publication number: 20180013035
    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: September 7, 2017
    Publication date: January 11, 2018
    Applicants: 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: 9844519
    Abstract: A method of treating TDP-43 proteinopathies such as Alzheimer's disease, amyotrophic lateral sclerosis, and fronto-temporal lobar dementia is presented herein. It was found that administering hexachlorophene to cells expressing endogenous TDP-43 or overexpressing wild-type TDP-43 reduced accumulation of TDP-43 in the cells.
    Type: Grant
    Filed: June 17, 2015
    Date of Patent: December 19, 2017
    Assignee: University of South Florida
    Inventors: Umesh K. Jinwal, Diego A. Peralta, Malathi Narayan
  • Patent number: 9833040
    Abstract: A footwear insole system for use with an article of footwear including a base insole component and an upper insole component. The base insole includes a chassis and first and a second shock absorbing inserts. The upper insole includes a spacer panel, first and a second gel insert members, and a fabric sheet layer. The insole system may be permanently secured to an article of footwear or the insole system may be replaceable or interchangeable for installation and removal to and from an article of footwear by a user.
    Type: Grant
    Filed: May 19, 2015
    Date of Patent: December 5, 2017
    Assignee: UKIES LLC
    Inventors: Umesh K. Khaitan, Kavita Khaitan
  • Patent number: 9793435
    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 30, 2015
    Date of Patent: October 17, 2017
    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: 9794866
    Abstract: Apparatuses, systems, and methods for user equipment (UE) devices to more efficiently scan frequency bands for potential base stations may include a UE configured to store information regarding results of prior cellular scan operations for a cell and to perform a new cellular scan operation while camped in the first cell. The new cellular scan operation may be partially based on the stored information. The prior cellular scan operations may have been performed to identify frequencies of available cellular base stations. The UE may update the information regarding results of prior cellular scan operations with information regarding success or failure of the new cellular scan operation. The UE may maintain lists of cells for which a cellular scan has been successful or unsuccessful and adjust the new cellular scan operation based at least partially on contents of at least one of these lists.
    Type: Grant
    Filed: April 16, 2015
    Date of Patent: October 17, 2017
    Assignee: Apple Inc.
    Inventors: Arvind Swaminathan, Umesh K. Shukla, Srinivas Pasupuleti
  • Publication number: 20170289886
    Abstract: Described herein are apparatus, systems and methods for opportunistic system selection and reselection to avoid jammer desense intermodulation distortion. A method may comprise, at a user equipment (“UE”), identifying a list of frequencies and bands available to a cellular modem of the UE for one of system selection and system reselection, identifying a subset of the list of frequencies and bands based on an operation of a non-cellular wireless communication component of the UE, storing the subset of the list of frequencies and bands in a graylist, and performing, by the cellular modem, a search for one of the system selection and the system reselection based on the graylist.
    Type: Application
    Filed: April 5, 2016
    Publication date: October 5, 2017
    Inventors: Harsha SHIRAHATTI, Umesh K. SHUKLA
  • Patent number: 9750753
    Abstract: A method of treating a disease associated with mutation of LRRK2 protein is presented herein. It was found that administering hexachlorophene to cells expressing endogenous LRRK2 or overexpressing wild-type or mutant LRRK2 reduced the total LRRK2 level in the cells.
    Type: Grant
    Filed: June 17, 2015
    Date of Patent: September 5, 2017
    Assignee: University of South Florida
    Inventors: Umesh K. Jinwal, Malathi Narayan
  • Publication number: 20170238167
    Abstract: Generating and using a device-type specific preferred public land mobile network (PLMN) list for roaming PLMN selection. Wireless devices sharing one or more common characteristics may be tasked with collecting roaming PLMN selection data. That data may be collected and used to generate a preferred PLMN list specific to wireless devices sharing those common characteristics. The preferred PLMN list may be distributed to wireless devices sharing those common characteristics, which may then use it in conjunction with roaming PLMN selection.
    Type: Application
    Filed: May 3, 2017
    Publication date: August 17, 2017
    Inventors: Qin Zhang, Madhusudan Chaudhary, Longda Xing, Umesh K. Shukla, Bo Wang, Zhiwei Wang, Yaoqi Yan, Qiang Miao
  • Patent number: 9706484
    Abstract: Apparatuses, systems, and methods for user equipment (UE) devices to more efficiently scan frequency bands for potential base stations may include a UE configured maintain a first list of cells for which a cellular scan has been successful and a second list of cells for which a cellular scan has not been successful. The UE may be configured perform a first cellular while camped on a first cell at an expiration of a scan timer and, if the cellular scan is not successful, the increment a first failure count variable associated with the first cell and add the first cell to the second list if the first cell is not present on the first or second list. Additionally, if the first cellular scan is successful, the UE may be configured to add the first cell to the first list if the first cell is not present on the first list.
    Type: Grant
    Filed: June 5, 2015
    Date of Patent: July 11, 2017
    Assignee: Apple Inc.
    Inventors: Arvind Swaminathan, Umesh K. Shukla, Srinivas Pasupuleti, Viswanath Nagarajan, Thanigaivelu Elangovan, Madhusudan Chaudhary
  • Patent number: 9691712
    Abstract: Methods of controlling stress in GaN films deposited on silicon and silicon carbide substrates and the films produced therefrom are disclosed. A typical method comprises providing a substrate and depositing a graded gallium nitride layer on the substrate having a varying composition of a substantially continuous grade from an initial composition to a final composition formed from a supply of at least one precursor in a growth chamber without any interruption in the supply. A typical semiconductor film comprises a substrate and a graded gallium nitride layer deposited on the substrate having a varying composition of a substantially continuous grade from an initial composition to a final composition formed from a supply of at least one precursor in a growth chamber without any interruption in the supply.
    Type: Grant
    Filed: August 22, 2014
    Date of Patent: June 27, 2017
    Assignee: The Regents of the University of California
    Inventors: Hugues Marchand, Brendan J. Moran, Umesh K. Mishra, James S. Speck
  • Patent number: 9668203
    Abstract: Generating and using a device-type specific preferred public land mobile network (PLMN) list for roaming PLMN selection. Wireless devices sharing one or more common characteristics may be tasked with collecting roaming PLMN selection data. That data may be collected and used to generate a preferred PLMN list specific to wireless devices sharing those common characteristics. The preferred PLMN list may be distributed to wireless devices sharing those common characteristics, which may then use it in conjunction with roaming PLMN selection.
    Type: Grant
    Filed: May 29, 2014
    Date of Patent: May 30, 2017
    Assignee: Apple Inc.
    Inventors: Qin Zhang, Madhusudan Chaudhary, Longda Xing, Umesh K Shukla, Bo Wang, Zhiwei Wang, Yaoqi Yan, Qiang Miao
  • Publication number: 20170125574
    Abstract: Trenched vertical power field-effect transistors with improved on-resistance and/or breakdown voltage are fabricated. In one or more embodiments, the modulation of the current flow of the transistor occurs in the lateral channel, whereas the voltage is predominantly held in the vertical direction in the off-state. When the device is in the on-state, the current is channeled through an aperture in a current-blocking region after it flows under a gate region into the drift region. In another embodiment, a novel vertical power low-loss semiconductor multi-junction device in III-nitride and non-III-nitride material system is provided. One or more multi-junction device embodiments aim at providing enhancement mode (normally-off) operation alongside ultra-low on resistance and high breakdown voltage.
    Type: Application
    Filed: November 4, 2016
    Publication date: May 4, 2017
    Applicants: The Regents of the University of Calfornia, Arizona Board of Regents on Behalf of Arizona State University
    Inventors: Srabanti Chowdhury, Jeonghee Kim, Chirag Gupta, Stacia Keller, Silvia H. Chan, Umesh K. Mishra
  • Patent number: 9619911
    Abstract: Various arrangements for organizing virtual objects within an augmented reality display are presented. A display may be provided and configured to present a virtual field-of-view having multiple virtual objects superimposed on a real-world scene. Priorities may be assigned to multiple regions of the virtual field-of-view based on real-world objects present within the real-world scene. A priority of a region of the multiple regions may be based on one or more real-world objects identified in the region. The multiple virtual objects may be displayed within the virtual field-of-view arranged based on the prioritized multiple regions.
    Type: Grant
    Filed: February 1, 2013
    Date of Patent: April 11, 2017
    Assignee: QUALCOMM Incorporated
    Inventors: Umesh K. Pandey, Chandrasekar Srinivasan