Patents by Inventor Ashish Tandon

Ashish Tandon 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: 20210255211
    Abstract: Some embodiments include a method and apparatus which obtains sensor data associated with a vehicle. The sensor data includes three-dimensional acceleration data and three-dimensional rotation data, with respect to a sensor coordinate system. A gravity vector is obtained, and it is determined when the vehicle starts moving. Acceleration direction is used as a forward direction of the vehicle. It is determined from the rotation data when the vehicle changes direction, the rotation data indicating two different directions. The gravity vector is used to distinguish which is an upward direction by selecting directions the direction which has larger angle with respect to the gravity vector as the upward direction. The forward direction and upward direction are used to determine a rightward direction. The forward direction, upward direction and rightward direction represent the vehicle coordinate system. The orientation of the apparatus with respect to the orientation of the vehicle is determined.
    Type: Application
    Filed: July 3, 2018
    Publication date: August 19, 2021
    Inventors: Péter SZILÁGYI, Csaba VULKÁN, Joachim WUILMET, Ashish TANDON, Zoltán LÁZÁR, Ali SHARAF
  • Patent number: 10957820
    Abstract: A light-emitting device is disclosed which includes a segmented active layer disposed between a segmented conductivity layer and a continuous conductivity layer, the active layer, the segmented conductivity layer, and the continuous conductivity layer being arranged to define a plurality of pixels, each pixel including a different segment of the segmented conductivity layer and the segmented active layer. A continuous wavelength converting layer disposed on the continuous conductivity layer is provided. A plurality of first contacts, each first contact being electrically connected to a different segment of the segmented conductivity layer is provided. One or more second contacts that are electrically connected to the continuous conductivity layer are also provided, the number of second contacts being less than the number of first contacts.
    Type: Grant
    Filed: December 19, 2018
    Date of Patent: March 23, 2021
    Assignee: Lumileds LLC
    Inventors: Luke Gordon, Oleg Shchekin, Ashish Tandon, Rajat Sharma, Joseph Flemish, Andrei Papou, Wen Yu, Erik Young
  • Publication number: 20190198564
    Abstract: A device may include a metal contact between a first isolation region and a second isolation region on a first surface of an epitaxial layer. The device may include a first sidewall and a second sidewall on a second surface of the epitaxial layer distal to the first isolation region and the second isolation region. The device may include a wavelength converting layer on the epitaxial layer between the first sidewall and the second sidewall.
    Type: Application
    Filed: December 19, 2018
    Publication date: June 27, 2019
    Applicant: Lumileds LLC
    Inventors: Ashish TANDON, Rajat SHARMA, Joseph Robert FLEMISH, Andrei PAPOU, Wen YU, Erik YOUNG, Yu-Chen SHEN, Luke GORDON
  • Publication number: 20190198716
    Abstract: A light-emitting device is disclosed which includes a segmented active layer disposed between a segmented conductivity layer and a continuous conductivity layer, the active layer, the segmented conductivity layer, and the continuous conductivity layer being arranged to define a plurality of pixels, each pixel including a different segment of the segmented conductivity layer and the segmented active layer. A continuous wavelength converting layer disposed on the continuous conductivity layer is provided. A plurality of first contacts, each first contact being electrically connected to a different segment of the segmented conductivity layer is provided. One or more second contacts that are electrically connected to the continuous conductivity layer are also provided, the number of second contacts being less than the number of first contacts.
    Type: Application
    Filed: December 19, 2018
    Publication date: June 27, 2019
    Applicant: Lumileds LLC
    Inventors: Luke GORDON, Oleg SHCHEKIN, Ashish TANDON, Rajat SHARMA, Joseph FLEMISH, Andrei PAPOU, Wen YU, Erik YOUNG
  • Publication number: 20190189682
    Abstract: A light emitting diode (LED) array may include an epitaxial layer comprising a first pixel and a second pixel separated by an isolation region. A reflective layer may be formed on the epitaxial layer. A p-type contact layer may be formed on the reflective layer. The isolation region may have a width that is at least a width of a trench formed in a p-type contact layer.
    Type: Application
    Filed: December 19, 2018
    Publication date: June 20, 2019
    Applicant: Lumileds LLC
    Inventors: Erik YOUNG, Joseph Robert FLEMISH, Ashish TANDON, Rajat SHARMA, Andrei PAPOU, Wen YU, Yu-Chen SHEN, Luke GORDON
  • Publication number: 20190189879
    Abstract: A device may include a substrate having a first embedded transistor in a first region and a second embedded transistor in a second region. The first region and the second region may be separated by trench extending through at least a portion of an epitaxial layer formed on the substrate. The first embedded transistor may be connected to a first light emitting diode (LED) and the second embedded transistor may be connected to a second LED. A first optical isolation layer may be between the epitaxial layer and the first region of the substrate. A second optical isolation layer may be between the epitaxial layer and the second region of the substrate.
    Type: Application
    Filed: December 19, 2018
    Publication date: June 20, 2019
    Applicant: Lumileds LLC
    Inventors: Ashish TANDON, Luke GORDON, Yu-Chen SHEN
  • Publication number: 20130174900
    Abstract: A thin-film photovoltaic devices includes transparent conductive oxide which has embedded within it nanowires at less than 2% nominal shadowing area. The nanowires enhance the electrical conductivity of the conductive oxide.
    Type: Application
    Filed: July 6, 2012
    Publication date: July 11, 2013
    Applicant: Stion Corporation
    Inventors: Chester A. Farris, III, Robert D. Wieting, Ashish Tandon
  • Patent number: 8461061
    Abstract: A method of supporting a plurality of planar substrates in a tube shaped furnace for conducting a thermal treatment process is disclosed. The method uses a boat fixture having a base frame including two length portions and a first width portion, a second width portion, and one or more middle members connected between the two length portions. Additionally, the method includes mounting a removable first grooved rod respectively on the first width portion, the second width portion, and each of the one or more middle members, each first grooved rod having a first plurality of grooves characterized by a first spatial configuration. The method further includes inserting one or two substrates of a plurality of planar substrates into each groove in the boat fixture separated by a distance.
    Type: Grant
    Filed: June 28, 2011
    Date of Patent: June 11, 2013
    Assignee: Stion Corporation
    Inventors: Paul Alexander, Jurg Schmitzberger, Ashish Tandon, Robert D. Wieting
  • Patent number: 8398772
    Abstract: An apparatus for reactive thermal treatment of thin film photovoltaic devices includes a furnace tube including an inner wall extended from a first end to a second end. The apparatus further includes a gas supply device coupled to the second end and configured to fill one or more working gases into the furnace tube. Additionally, the apparatus includes a cover configured to seal the furnace tube at the first end and serve as a heat sink for the one or more working gases. Furthermore, the apparatus includes a fixture mechanically attached to the cover. The fixture is configured to load an array of substrates into the furnace tube as the cover seals the furnace tube. Moreover, the apparatus includes a crescent shaped baffle member disposed seamlessly at a lower portion of the inner wall for blocking a convection current of the one or more working gases cooled by the cover.
    Type: Grant
    Filed: August 17, 2010
    Date of Patent: March 19, 2013
    Assignee: Stion Corporation
    Inventors: Ashish Tandon, Robert D. Wieting, Jurg Schmizberger, Paul Alexander
  • Publication number: 20120264072
    Abstract: An apparatus for performing reactive thermal treatment of thin film photovoltaic devices includes a furnace having a tubular body surrounded by heaters and cooling devices. The apparatus includes cooled doors at ends of the furnace separated from a central portion of the furnace by baffles. The cooled doors facilitate increased convection within the furnace and improve temperature uniformity.
    Type: Application
    Filed: January 18, 2012
    Publication date: October 18, 2012
    Applicant: Stion Corporation
    Inventor: Ashish Tandon
  • Publication number: 20120021552
    Abstract: A method of supporting a plurality of planar substrates in a tube shaped furnace for conducting a thermal treatment process is disclosed. The method uses a boat fixture having a base frame including two length portions and a first width portion, a second width portion, and one or more middle members connected between the two length portions. Additionally, the method includes mounting a removable first grooved rod respectively on the first width portion, the second width portion, and each of the one or more middle members, each first grooved rod having a first plurality of grooves characterized by a first spatial configuration. The method further includes inserting one or two substrates of a plurality of planar substrates into each groove in the boat fixture separated by a distance.
    Type: Application
    Filed: June 28, 2011
    Publication date: January 26, 2012
    Applicant: Stion Corporation
    Inventors: Paul Alexander, Jurg Schmitzberger, Ashish Tandon, Robert D. Wieting
  • Publication number: 20110259395
    Abstract: A high efficiency thin-film photovoltaic module is formed on a substrate. The photovoltaic module includes a plurality of stripe shaped photovoltaic cells electrically coupled to each other and physically disposed in parallel to the length one next to another across the width. Each cell includes a barrier material overlying the surface and a first electrode overlying the barrier material. Each cell further includes an absorber formed overlying the first electrode. The absorber includes a copper gallium indium diselenide compound material characterized by an energy band-gap of about 1 eV to 1.1 eV. Each cell additionally includes a buffer material overlying the absorber and a bi-layer zinc oxide material comprising a high resistivity transparent layer overlying the buffer material and a low resistivity transparent layer overlying the high resistivity transparent layer.
    Type: Application
    Filed: April 13, 2011
    Publication date: October 27, 2011
    Applicant: Stion Corporation
    Inventors: Robert D. Wieting, Rajiv Pethe, Kannan Ramanathan, May Shao, Ashish Tandon
  • Publication number: 20110220198
    Abstract: A method for forming a bifacial thin film photovoltaic cell includes providing a glass substrate having a surface region covered by an intermediate layer and forming a thin film photovoltaic cell on the surface region. Additionally, the thin film photovoltaic cell includes an anode overlying the intermediate layer, an absorber over the anode, and a window layer and cathode over the absorber mediated by a buffer layer. The anode comprises an aluminum doped zinc oxide (AZO) layer forming a first interface with the intermediate layer and a second interface with the absorber. The AZO layer is configured to induce Fermi level pinning at the first interface and a strain field from the first interface to the second interface.
    Type: Application
    Filed: March 16, 2011
    Publication date: September 15, 2011
    Applicant: Stion Corporation
    Inventors: Ashish Tandon, Fred Mikulec
  • Patent number: 7577172
    Abstract: In accordance with the invention, increased maximum modulation speeds and improved hole distribution are obtained for light emitting devices. Barrier layers of a quantum well structure for a light emitting device are formed with varying barrier energy heights. Quantum well layers of the quantum well structure are formed between the barrier layers.
    Type: Grant
    Filed: June 1, 2005
    Date of Patent: August 18, 2009
    Assignee: Agilent Technologies, Inc.
    Inventors: Ashish Tandon, Kostadin Djordjev, Chao-Kun Lin, Michael R. T. Tan
  • Patent number: 7443561
    Abstract: Double well structures in electro-absorption modulators are created in quantum well active regions by embedding deep ultra thin quantum wells. The perturbation introduced by the embedded, deep ultra thin quantum well centered within a conventional quantum well lowers the confined energy state for the wavefunction in the surrounding larger well and typically results in the hole and electron distributions being more confined to the center of the conventional quantum well. The extinction ratio provided by the electro-absorption modulator is typically increased.
    Type: Grant
    Filed: June 8, 2005
    Date of Patent: October 28, 2008
    Assignee: Avago Technologies Fiber IP (Singapore) Pte. Ltd.
    Inventors: David P. Bour, Ashish Tandon, Michael R. T. Tan
  • Patent number: 7358523
    Abstract: Subwells are added to quantum wells of light emitting semiconductor structures to shift their emission wavelengths to longer wavelengths. Typical applications of the invention are to InGaAs, InGaAsSb, InP and GaN material systems, for example.
    Type: Grant
    Filed: October 20, 2004
    Date of Patent: April 15, 2008
    Assignee: Avago Technologies Fiber IP Pte Ltd
    Inventors: Michael R. T. Tan, Ashish Tandon, David P. Bour
  • Publication number: 20070289853
    Abstract: Embodiments of the invention provide for improved separation of switching material by creating a diversion of the activating force. In one embodiment at least one structural element is positioned in close proximity to an inlet for the actuating force to influence the actuating force to fully separate the switching material. Structural elements may include protrusions, either adjacent to the inlet or approximately across the channel from the inlet, as well as at least one additional inlet. The diversion can be created, if desired, by forces coming from opposite sides. Embodiments of the invention make use of non-wettable surfaces lining the channel in regions where switching material is to break into separate volumes, and wettable surfaces away from such regions. Embodiments of the invention provide for multi-pole, multi-throw switching.
    Type: Application
    Filed: June 14, 2006
    Publication date: December 20, 2007
    Inventors: Timothy Beerling, Ashish Tandon, Atul Goel
  • Patent number: 7269196
    Abstract: The method comprises forming barrier layers of AlxGa1-xAs, forming a quantum well layer of InGaAs between the barrier layers, and forming an interfacial layer between the quantum well layer and each of the barrier layers.
    Type: Grant
    Filed: July 6, 2004
    Date of Patent: September 11, 2007
    Assignee: Avago Technologies Fiber IP (Singapore) Pte. Ltd.
    Inventors: Ashish Tandon, Michael R. T. Tan, Ying-Lan Chang
  • Publication number: 20060279828
    Abstract: Double well structures in electro-absorption modulators are created in quantum well active regions by embedding deep ultra thin quantum wells. The perturbation introduced by the embedded, deep ultra thin quantum well centered within a conventional quantum well lowers the confined energy state for the wavefunction in the surrounding larger well and typically results in the hole and electron distributions being more confined to the center of the conventional quantum well. The extinction ratio provided by the electro-absorption modulator is typically increased.
    Type: Application
    Filed: June 8, 2005
    Publication date: December 14, 2006
    Inventors: David Bour, Ashish Tandon, Michael Tan
  • Publication number: 20060274801
    Abstract: In accordance with the invention, increased maximum modulation speeds and improved hole distribution are obtained for light emitting devices. Barrier layers of a quantum well structure for a light emitting device are formed with varying barrier energy heights. Quantum well layers of the quantum well structure are formed between the barrier layers.
    Type: Application
    Filed: June 1, 2005
    Publication date: December 7, 2006
    Inventors: Ashish Tandon, Kostadin Djordjev, Chao-Kun Lin, Michael Tan