Patents by Inventor David S. Lyttle

David S. Lyttle 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: 11591714
    Abstract: A method of producing silicon carbide is disclosed. The method comprises the steps of providing a sublimation furnace comprising a furnace shell, at least one heating element positioned outside the furnace shell, and a hot zone positioned inside the furnace shell surrounded by insulation. The hot zone comprises a crucible with a silicon carbide precursor positioned in the lower region and a silicon carbide seed positioned in the upper region. The hot zone is heated to sublimate the silicon carbide precursor, forming silicon carbide on the bottom surface of the silicon carbide seed. Also disclosed is the sublimation furnace to produce the silicon carbide as well as the resulting silicon carbide material.
    Type: Grant
    Filed: November 30, 2020
    Date of Patent: February 28, 2023
    Assignee: GTAT Corporation
    Inventors: Roman V. Drachev, Santhanaraghavan Parthasarathy, Andriy M. Andrukhiv, David S. Lyttle
  • Patent number: 11505876
    Abstract: A method of producing silicon carbide is disclosed. The method comprises the steps of providing a sublimation furnace comprising a furnace shell, at least one heating element positioned outside the furnace shell, and a hot zone positioned inside the furnace shell surrounded by insulation. The hot zone comprises a crucible with a silicon carbide precursor positioned in the lower region and a silicon carbide seed positioned in the upper region. The hot zone is heated to sublimate the silicon carbide precursor, forming silicon carbide on the bottom surface of the silicon carbide seed. Also disclosed is the sublimation furnace to produce the silicon carbide as well as the resulting silicon carbide material.
    Type: Grant
    Filed: October 9, 2020
    Date of Patent: November 22, 2022
    Assignee: GTAT CORPORATION
    Inventors: Roman V. Drachev, Santhanaraghavan Parthasarathy, Andriy M. Andrukhiv, David S. Lyttle
  • Patent number: 11434582
    Abstract: A method of producing silicon carbide is disclosed. The method comprises the steps of providing a sublimation furnace comprising a furnace shell, at least one heating element positioned outside the furnace shell, and a hot zone positioned inside the furnace shell surrounded by insulation. The hot zone comprises a crucible with a silicon carbide precursor positioned in the lower region and a silicon carbide seed positioned in the upper region. The hot zone is heated to sublimate the silicon carbide precursor, forming silicon carbide on the bottom surface of the silicon carbide seed. Also disclosed is the sublimation furnace to produce the silicon carbide as well as the resulting silicon carbide material.
    Type: Grant
    Filed: February 27, 2020
    Date of Patent: September 6, 2022
    Assignee: GTAT Corporation
    Inventors: Roman V. Drachev, Santhanaraghavan Parthasarathy, Andriy M. Andrukhiv, David S. Lyttle
  • Patent number: 11421343
    Abstract: A method of producing silicon carbide is disclosed. The method comprises the steps of providing a sublimation furnace comprising a furnace shell, at least one heating element positioned outside the furnace shell, and a hot zone positioned inside the furnace shell surrounded by insulation. The hot zone comprises a crucible with a silicon carbide precursor positioned in the lower region and a silicon carbide seed positioned in the upper region. The hot zone is heated to sublimate the silicon carbide precursor, forming silicon carbide on the bottom surface of the silicon carbide seed. Also disclosed is the sublimation furnace to produce the silicon carbide as well as the resulting silicon carbide material.
    Type: Grant
    Filed: September 15, 2020
    Date of Patent: August 23, 2022
    Assignee: GTAT Corporation
    Inventors: Roman V. Drachev, Andriy M. Andrukhiv, David S. Lyttle, Santhanaraghavan Parthasarathy
  • Publication number: 20210095392
    Abstract: A method of producing silicon carbide is disclosed. The method comprises the steps of providing a sublimation furnace comprising a furnace shell, at least one heating element positioned outside the furnace shell, and a hot zone positioned inside the furnace shell surrounded by insulation. The hot zone comprises a crucible with a silicon carbide precursor positioned in the lower region and a silicon carbide seed positioned in the upper region. The hot zone is heated to sublimate the silicon carbide precursor, forming silicon carbide on the bottom surface of the silicon carbide seed. Also disclosed is the sublimation furnace to produce the silicon carbide as well as the resulting silicon carbide material.
    Type: Application
    Filed: September 15, 2020
    Publication date: April 1, 2021
    Inventors: Roman V. Drachev, Andriy M. Andrukhiv, David S. Lyttle, Santhanaraghavan Parthasarathy
  • Publication number: 20210087706
    Abstract: A method of producing silicon carbide is disclosed. The method comprises the steps of providing a sublimation furnace comprising a furnace shell, at least one heating element positioned outside the furnace shell, and a hot zone positioned inside the furnace shell surrounded by insulation. The hot zone comprises a crucible with a silicon carbide precursor positioned in the lower region and a silicon carbide seed positioned in the upper region. The hot zone is heated to sublimate the silicon carbide precursor, forming silicon carbide on the bottom surface of the silicon carbide seed. Also disclosed is the sublimation furnace to produce the silicon carbide as well as the resulting silicon carbide material.
    Type: Application
    Filed: November 30, 2020
    Publication date: March 25, 2021
    Inventors: Roman V. Drachev, Santhanaraghavan Parthasarathy, Andriy M. Andrukhiv, David S. Lyttle
  • Publication number: 20210032770
    Abstract: A method of producing silicon carbide is disclosed. The method comprises the steps of providing a sublimation furnace comprising a furnace shell, at least one heating element positioned outside the furnace shell, and a hot zone positioned inside the furnace shell surrounded by insulation. The hot zone comprises a crucible with a silicon carbide precursor positioned in the lower region and a silicon carbide seed positioned in the upper region. The hot zone is heated to sublimate the silicon carbide precursor, forming silicon carbide on the bottom surface of the silicon carbide seed. Also disclosed is the sublimation furnace to produce the silicon carbide as well as the resulting silicon carbide material.
    Type: Application
    Filed: October 9, 2020
    Publication date: February 4, 2021
    Inventors: Roman V. Drachev, Parthasarathy Santhanaraghavan, Andriy M. Andrukhiv, David S. Lyttle
  • Patent number: 10851473
    Abstract: A method of producing silicon carbide is disclosed. The method comprises the steps of providing a sublimation furnace comprising a furnace shell, at least one heating element positioned outside the furnace shell, and a hot zone positioned inside the furnace shell surrounded by insulation. The hot zone comprises a crucible with a silicon carbide precursor positioned in the lower region and a silicon carbide seed positioned in the upper region. The hot zone is heated to sublimate the silicon carbide precursor, forming silicon carbide on the bottom surface of the silicon carbide seed. Also disclosed is the sublimation furnace to produce the silicon carbide as well as the resulting silicon carbide material.
    Type: Grant
    Filed: September 5, 2014
    Date of Patent: December 1, 2020
    Assignee: GTAT Corporation
    Inventors: Roman V. Drachev, Parthasarathy Santhanaraghavan, Andriy M. Andrukhiv, David S. Lyttle
  • Patent number: 10801126
    Abstract: A method of producing silicon carbide is disclosed. The method comprises the steps of providing a sublimation furnace comprising a furnace shell, at least one heating element positioned outside the furnace shell, and a hot zone positioned inside the furnace shell surrounded by insulation. The hot zone comprises a crucible with a silicon carbide precursor positioned in the lower region and a silicon carbide seed positioned in the upper region. The hot zone is heated to sublimate the silicon carbide precursor, forming silicon carbide on the bottom surface of the silicon carbide seed. Also disclosed is the sublimation furnace to produce the silicon carbide as well as the resulting silicon carbide material.
    Type: Grant
    Filed: September 5, 2014
    Date of Patent: October 13, 2020
    Assignee: GTAT Corporation
    Inventors: Roman V. Drachev, Parthasarathy Santhanaraghavan, Andriy M. Andrukhiv, David S. Lyttle
  • Patent number: 10793971
    Abstract: A method of producing silicon carbide is disclosed. The method comprises the steps of providing a sublimation furnace comprising a furnace shell, at least one heating element positioned outside the furnace shell, and a hot zone positioned inside the furnace shell surrounded by insulation. The hot zone comprises a crucible with a silicon carbide precursor positioned in the lower region and a silicon carbide seed positioned in the upper region. The hot zone is heated to sublimate the silicon carbide precursor, forming silicon carbide on the bottom surface of the silicon carbide seed. Also disclosed is the sublimation furnace to produce the silicon carbide as well as the resulting silicon carbide material.
    Type: Grant
    Filed: September 5, 2014
    Date of Patent: October 6, 2020
    Assignee: GTAT Corporation
    Inventors: Roman V. Drachev, Andriy M. Andrukhiv, David S. Lyttle, Parthasarathy Santhanaraghavan
  • Publication number: 20200199777
    Abstract: A method of producing silicon carbide is disclosed. The method comprises the steps of providing a sublimation furnace comprising a furnace shell, at least one heating element positioned outside the furnace shell, and a hot zone positioned inside the furnace shell surrounded by insulation. The hot zone comprises a crucible with a silicon carbide precursor positioned in the lower region and a silicon carbide seed positioned in the upper region. The hot zone is heated to sublimate the silicon carbide precursor, forming silicon carbide on the bottom surface of the silicon carbide seed. Also disclosed is the sublimation furnace to produce the silicon carbide as well as the resulting silicon carbide material.
    Type: Application
    Filed: February 27, 2020
    Publication date: June 25, 2020
    Inventors: Roman V. Drachev, Parthasarathy Santhanaraghavan, Andriy M. Andrukhiv, David S. Lyttle
  • Patent number: 10633762
    Abstract: A method of producing silicon carbide is disclosed. The method comprises the steps of providing a sublimation furnace comprising a furnace shell, at least one heating element positioned outside the furnace shell, and a hot zone positioned inside the furnace shell surrounded by insulation. The hot zone comprises a crucible with a silicon carbide precursor positioned in the lower region and a silicon carbide seed positioned in the upper region. The hot zone is heated to sublimate the silicon carbide precursor, forming silicon carbide on the bottom surface of the silicon carbide seed. Also disclosed is the sublimation furnace to produce the silicon carbide as well as the resulting silicon carbide material.
    Type: Grant
    Filed: September 5, 2014
    Date of Patent: April 28, 2020
    Assignee: GTAT Corporation.
    Inventors: Roman V. Drachev, Parthasarathy Santhanaraghavan, Andriy M. Andrukhiv, David S. Lyttle
  • Patent number: 9512542
    Abstract: A method of producing silicon carbide is disclosed. The method comprises the steps of providing a sublimation furnace comprising a furnace shell, at least one heating element positioned outside the furnace shell, and a hot zone positioned inside the furnace shell surrounded by insulation. The hot zone comprises a crucible with a silicon carbide precursor positioned in the lower region and a silicon carbide seed positioned in the upper region. The hot zone is heated to sublimate the silicon carbide precursor, forming silicon carbide on the bottom surface of the silicon carbide seed. Also disclosed is the sublimation furnace to produce the silicon carbide as well as the resulting silicon carbide material.
    Type: Grant
    Filed: September 5, 2014
    Date of Patent: December 6, 2016
    Assignee: GTAT Corporation
    Inventors: Roman V. Drachev, Parthasarathy Santhanaraghavan, Andriy M. Andrukhiv, David S. Lyttle
  • Publication number: 20150072101
    Abstract: A method of producing silicon carbide is disclosed. The method comprises the steps of providing a sublimation furnace comprising a furnace shell, at least one heating element positioned outside the furnace shell, and a hot zone positioned inside the furnace shell surrounded by insulation. The hot zone comprises a crucible with a silicon carbide precursor positioned in the lower region and a silicon carbide seed positioned in the upper region. The hot zone is heated to sublimate the silicon carbide precursor, forming silicon carbide on the bottom surface of the silicon carbide seed. Also disclosed is the sublimation furnace to produce the silicon carbide as well as the resulting silicon carbide material.
    Type: Application
    Filed: September 5, 2014
    Publication date: March 12, 2015
    Inventors: Roman V. Drachev, Parthasarathy Santhanaraghavan, Andriy M. Andrukhiv, David S. Lyttle
  • Publication number: 20150068446
    Abstract: A method of producing silicon carbide is disclosed. The method comprises the steps of providing a sublimation furnace comprising a furnace shell, at least one heating element positioned outside the furnace shell, and a hot zone positioned inside the furnace shell surrounded by insulation. The hot zone comprises a crucible with a silicon carbide precursor positioned in the lower region and a silicon carbide seed positioned in the upper region. The hot zone is heated to sublimate the silicon carbide precursor, forming silicon carbide on the bottom surface of the silicon carbide seed. Also disclosed is the sublimation furnace to produce the silicon carbide as well as the resulting silicon carbide material.
    Type: Application
    Filed: September 5, 2014
    Publication date: March 12, 2015
    Inventors: Roman V. Drachev, Andriy M. Andrukhiv, David S. Lyttle, Parthasarathy Santhanaraghavan
  • Publication number: 20150068447
    Abstract: A method of producing silicon carbide is disclosed. The method comprises the steps of providing a sublimation furnace comprising a furnace shell, at least one heating element positioned outside the furnace shell, and a hot zone positioned inside the furnace shell surrounded by insulation. The hot zone comprises a crucible with a silicon carbide precursor positioned in the lower region and a silicon carbide seed positioned in the upper region. The hot zone is heated to sublimate the silicon carbide precursor, forming silicon carbide on the bottom surface of the silicon carbide seed. Also disclosed is the sublimation furnace to produce the silicon carbide as well as the resulting silicon carbide material.
    Type: Application
    Filed: September 5, 2014
    Publication date: March 12, 2015
    Inventors: Roman V. Drachev, Parthasarathy Santhanaraghavan, Andriy M. Andrukhiv, David S. Lyttle
  • Publication number: 20150068445
    Abstract: A method of producing silicon carbide is disclosed. The method comprises the steps of providing a sublimation furnace comprising a furnace shell, at least one heating element positioned outside the furnace shell, and a hot zone positioned inside the furnace shell surrounded by insulation. The hot zone comprises a crucible with a silicon carbide precursor positioned in the lower region and a silicon carbide seed positioned in the upper region. The hot zone is heated to sublimate the silicon carbide precursor, forming silicon carbide on the bottom surface of the silicon carbide seed. Also disclosed is the sublimation furnace to produce the silicon carbide as well as the resulting silicon carbide material.
    Type: Application
    Filed: September 5, 2014
    Publication date: March 12, 2015
    Inventors: Roman V. Drachev, Parthasarathy Santhanaraghavan, Andriy M. Andrukhiv, David S. Lyttle
  • Publication number: 20150068457
    Abstract: A method of producing silicon carbide is disclosed. The method comprises the steps of providing a sublimation furnace comprising a furnace shell, at least one heating element positioned outside the furnace shell, and a hot zone positioned inside the furnace shell surrounded by insulation. The hot zone comprises a crucible with a silicon carbide precursor positioned in the lower region and a silicon carbide seed positioned in the upper region. The hot zone is heated to sublimate the silicon carbide precursor, forming silicon carbide on the bottom surface of the silicon carbide seed. Also disclosed is the sublimation furnace to produce the silicon carbide as well as the resulting silicon carbide material.
    Type: Application
    Filed: September 5, 2014
    Publication date: March 12, 2015
    Inventors: Roman V. Drachev, Parthasarathy Santhanaraghavan, Andriy M. Andrukhiv, David S. Lyttle