Patents by Inventor JOSEPHINE BEA CHANG

JOSEPHINE BEA CHANG 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: 10985243
    Abstract: A transistor is provided that comprises a source region overlying a base structure, a drain region overlying the base structure, and a block of semiconducting material overlying the base structure and being disposed between the source region and the drain region. The block of semiconducting material comprises a gate controlled region adjacent the source region, and a drain access region disposed between the gate controlled region and the drain region. The drain access region is formed of a plurality of semiconducting material ridges spaced apart from one another by non-channel trench openings, wherein at least a portion of the non-channel trench openings being filled with a doped material to provide a depletion region to improve breakdown voltage of the transistor.
    Type: Grant
    Filed: August 13, 2020
    Date of Patent: April 20, 2021
    Assignee: NORTHROP GRUMMAN SYSTEMS CORPORATION
    Inventors: Josephine Bea Chang, Eric J. Stewart, Ken Alfred Nagamatsu, Robert S. Howell, Shalini Gupta
  • Publication number: 20200373384
    Abstract: A transistor is provided that comprises a source region overlying a base structure, a drain region overlying the base structure, and a block of semiconducting material overlying the base structure and being disposed between the source region and the drain region. The block of semiconducting material comprises a gate controlled region adjacent the source region, and a drain access region disposed between the gate controlled region and the drain region. The drain access region is formed of a plurality of semiconducting material ridges spaced apart from one another by non-channel trench openings, wherein at least a portion of the non-channel trench openings being filled with a doped material to provide a depletion region to improve breakdown voltage of the transistor.
    Type: Application
    Filed: August 13, 2020
    Publication date: November 26, 2020
    Applicant: NORTHROP GRUMMAN SYSTEMS CORPORATION
    Inventors: JOSEPHINE BEA CHANG, ERIC J. STEWART, KEN ALFRED NAGAMATSU, ROBERT S. HOWELL, SHALINI GUPTA
  • Patent number: 10804387
    Abstract: A vertical transistor is provided that includes a base structure and a superlattice structure overlying the base structure. The superlattice structure comprises a multichannel ridge having sidewalls. The multichannel ridge comprises a plurality of heterostructures that each form a channel of the multichannel ridge. The vertical transistor also includes a source region that overlies the base structure and is in contact with a first end of the superlattice structure, a floating drain that overlies the base structure and is in contact with a second end of the superlattice structure, and a drain. When the vertical transistor is in an ‘ON’ state, current flows from the source region through the channels of the multichannel ridge to the floating drain, which funnels the current to the drain through at least a portion of the base structure.
    Type: Grant
    Filed: March 21, 2019
    Date of Patent: October 13, 2020
    Assignee: NORTHROP GRUMMAN SYSTEMS CORPORATION
    Inventors: Josephine Bea Chang, Robert S. Howell, Matthew R. King
  • Publication number: 20200303536
    Abstract: A vertical transistor is provided that includes a base structure and a superlattice structure overlying the base structure. The superlattice structure comprises a multichannel ridge having sidewalls. The multichannel ridge comprises a plurality of heterostructures that each form a channel of the multichannel ridge. The vertical transistor also includes a source region that overlies the base structure and is in contact with a first end of the superlattice structure, a floating drain that overlies the base structure and is in contact with a second end of the superlattice structure, and a drain. When the vertical transistor is in an ‘ON’ state, current flows from the source region through the channels of the multichannel ridge to the floating drain, which funnels the current to the drain through at least a portion of the base structure.
    Type: Application
    Filed: March 21, 2019
    Publication date: September 24, 2020
    Applicant: NORTHROP GRUMMAN SYSTEMS CORPORATION
    Inventors: JOSEPHINE BEA CHANG, ROBERT S. HOWELL, MATTHEW R. KING
  • Patent number: 10784341
    Abstract: A transistor is provided that comprises a source region overlying a base structure, a drain region overlying the base structure, and a block of semiconducting material overlying the base structure and being disposed between the source region and the drain region. The block of semiconducting material comprises a gate controlled region adjacent the source region, and a drain access region disposed between the gate controlled region and the drain region. The drain access region is formed of a plurality of semiconducting material ridges spaced apart from one another by non-channel trench openings, wherein at least a portion of the non-channel trench openings being filled with a doped material to provide a depletion region to improve breakdown voltage of the transistor.
    Type: Grant
    Filed: January 21, 2019
    Date of Patent: September 22, 2020
    Assignee: NORTHROP GRUMNIAN SYSTEMS CORPORATION
    Inventors: Josephine Bea Chang, Eric J. Stewart, Ken Alfred Nagamatsu, Robert S. Howell, Shalini Gupta
  • Publication number: 20200235202
    Abstract: A transistor is provided that comprises a source region overlying a base structure, a drain region overlying the base structure, and a block of semiconducting material overlying the base structure and being disposed between the source region and the drain region. The block of semiconducting material comprises a gate controlled region adjacent the source region, and a drain access region disposed between the gate controlled region and the drain region. The drain access region is formed of a plurality of semiconducting material ridges spaced apart from one another by non-channel trench openings, wherein at least a portion of the non-channel trench openings being filled with a doped material to provide a depletion region to improve breakdown voltage of the transistor.
    Type: Application
    Filed: January 21, 2019
    Publication date: July 23, 2020
    Applicant: NORTHROP GRUMMAN SYSTEMS CORPORATION
    Inventors: JOSEPHINE BEA CHANG, ERIC J. STEWART, KEN ALFRED NAGAMATSU, ROBERT S. HOWELL, SHALINI GUPTA