Patents by Inventor Elizabeth C. Stewart

Elizabeth C. Stewart 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: 11205695
    Abstract: Methods of fabricating a thick oxide feature on a semiconductor wafer include forming a oxide layer having a thickness of at least six micrometers and depositing a photoresist layer on the oxide layer. The oxide layer has a first etch rate of X with a given etchant, the photoresist layer has a second etch rate of Y with the given etchant and the ratio of X:Y is less than 4:1. Prior to etching the photoresist layer and the oxide layer, the photoresist layer is patterned with a grayscale mask that creates a photoresist layer having a sidewall that forms an angle with the horizontal that is less than or equal to 10 degrees.
    Type: Grant
    Filed: December 21, 2017
    Date of Patent: December 21, 2021
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Elizabeth C. Stewart, Jeffrey Alan West, Thomas D. Bonifield, Jay Sung Chun, Byron Lovell Williams
  • Patent number: 11087451
    Abstract: A method comprises obtaining a wafer comprising a plurality of components, wherein each of the plurality of components exposes a first surface of the component present in a first focal plane and a second surface of the component present in a second focal plane. The method comprises generating, by an optical tool, a first image of the first surface and a second image of the second surface of one of the plurality of components. The method comprises comparing, by a processor, the first image with a first reference image to produce a first value and the second image with a second reference image to produce a second value. The method comprises generating, by the processor, a wafer map indicating a quality state of the one of the plurality of components based on the first and second values.
    Type: Grant
    Filed: December 19, 2017
    Date of Patent: August 10, 2021
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Elizabeth C. Stewart, Young Sawk Oh, Zhiyi Yu, Jeffrey A. West, Thomas D. Bonifield
  • Patent number: 10886120
    Abstract: An integrated circuit a semiconductor substrate includes a device die with includes transistors configured to execute an electrical function. A first interconnect layer of the device die is configured to route electrical signals or power to terminals of the transistors. An interlevel dielectric (ILD) layer is located over the interconnect layer. A metal electrode located over the ILD layer. A dielectric barrier layer is located between the ILD layer and the metal electrode. A scribe seal surrounds the device die. A first opening within the dielectric barrier layer surrounds the metal electrode. Second and third openings within the dielectric barrier layer are located between the first opening and the scribe seal.
    Type: Grant
    Filed: August 16, 2019
    Date of Patent: January 5, 2021
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Jeffrey Alan West, Adrian Salinas, Elizabeth C. Stewart, Dhanoop Varghese, Thomas D. Bonifield
  • Publication number: 20200058485
    Abstract: An integrated circuit a semiconductor substrate includes a device die with includes transistors configured to execute an electrical function. A first interconnect layer of the device die is configured to route electrical signals or power to terminals of the transistors. An interlevel dielectric (ILD) layer is located over the interconnect layer. A metal electrode located over the ILD layer. A dielectric barrier layer is located between the ILD layer and the metal electrode. A scribe seal surrounds the device die. A first opening within the dielectric barrier layer surrounds the metal electrode. Second and third openings within the dielectric barrier layer are located between the first opening and the scribe seal.
    Type: Application
    Filed: August 16, 2019
    Publication date: February 20, 2020
    Inventors: Jeffrey Alan West, Adrian Salinas, Elizabeth C. Stewart, Dhanoop Varghese, Thomas D. Bonifield
  • Publication number: 20190198604
    Abstract: Methods of fabricating a thick oxide feature on a semiconductor wafer include forming a oxide layer having a thickness of at least six micrometers and depositing a photoresist layer on the oxide layer. The oxide layer has a first etch rate of X with a given etchant, the photoresist layer has a second etch rate of Y with the given etchant and the ratio of X:Y is less than 4:1. Prior to etching the photoresist layer and the oxide layer, the photoresist layer is patterned with a grayscale mask that creates a photoresist layer having a sidewall that forms an angle with the horizontal that is less than or equal to 10 degrees.
    Type: Application
    Filed: December 21, 2017
    Publication date: June 27, 2019
    Inventors: Elizabeth C. Stewart, Jeffrey Alan West, Thomas D. Bonifield, Jay Sung Chun, Byron Lovell Williams
  • Publication number: 20190188839
    Abstract: A method comprises obtaining a wafer comprising a plurality of components, wherein each of the plurality of components exposes a first surface of the component present in a first focal plane and a second surface of the component present in a second focal plane. The method comprises generating, by an optical tool, a first image of the first surface and a second image of the second surface of one of the plurality of components. The method comprises comparing, by a processor, the first image with a first reference image to produce a first value and the second image with a second reference image to produce a second value. The method comprises generating, by the processor, a wafer map indicating a quality state of the one of the plurality of components based on the first and second values.
    Type: Application
    Filed: December 19, 2017
    Publication date: June 20, 2019
    Inventors: Elizabeth C. STEWART, Young Sawk OH, Zhiyi YU, Jeffrey A. WEST, Thomas D. BONIFIELD
  • Patent number: 4737307
    Abstract: A cleansing composition capable of removing smegma comprises in an aqueous solution a cleansing agent comprising a mixture of surface active agents in the indicated amounts as follows:(i) from a trace to 0.2% by weight, based on the total weight of said composition, as an active material of cetylpyridinium chloride,(ii) from a trace to not more than 20 ppm chlorine dioxide, plus 20 ppm sodium hypochlorite,(iii) from a trace to 1% by weight, based on the total weight of said composition as an active material, of polyoxyethylene (20) sorbitan monostearate, and(iv) sodium benzoate from a trace to 2%.
    Type: Grant
    Filed: July 23, 1987
    Date of Patent: April 12, 1988
    Inventors: Robert L. Brown, Elizabeth C. Stewart
  • Patent number: 4692262
    Abstract: A cleansing composition capable of removing smegma comprises in an aqueous solution a cleansing agent comprising a mixture of surface active agents in the indicated amounts as follows:(i) from a trace to 0.2% by weight, based on the total weight of said composition, as an active material of cetylpyridinium chloride,(ii) from a trace to not more than 20 ppm chlorine dioxide,(iii) from a trace to 1% by weight, based on the total weight of said composition as an active material, of polyoxyethylene (20) sorbitan monosterate, and(iv) sodium lauryl sulfate from a trace to 2%.
    Type: Grant
    Filed: September 18, 1986
    Date of Patent: September 8, 1987
    Inventors: Robert L. Brown, Elizabeth C. Stewart