Patents by Inventor Chihoko AKIYAMA

Chihoko AKIYAMA 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: 11749622
    Abstract: A field effect transistor includes: a semiconductor region including a first inactive region, an active region, and a second inactive region arranged side by side in a first direction; a gate electrode, a source electrode, and a drain electrode on the active region; a gate pad on the first inactive region; a gate guard on and in contact with the semiconductor region, the gate guard being apart from the gate pad and located between an edge on the first inactive region side of the semiconductor region and the gate pad; a drain pad on the second inactive region; a drain guard on and in contact with the semiconductor region, the drain guard being apart from the drain pad and located between an edge on the second inactive region side of the semiconductor region and the drain pad; and a metal film electrically connected to the gate guard.
    Type: Grant
    Filed: June 30, 2021
    Date of Patent: September 5, 2023
    Assignee: SUMITOMO DEVICE INNOVATIONS, INC.
    Inventor: Chihoko Akiyama
  • Publication number: 20210327827
    Abstract: A field effect transistor includes: a semiconductor region including a first inactive region, an active region, and a second inactive region arranged side by side in a first direction; a gate electrode, a source electrode, and a drain electrode on the active region; a gate pad on the first inactive region; a gate guard on and in contact with the semiconductor region, the gate guard being apart from the gate pad and located between an edge on the first inactive region side of the semiconductor region and the gate pad; a drain pad on the second inactive region; a drain guard on and in contact with the semiconductor region, the drain guard being apart from the drain pad and located between an edge on the second inactive region side of the semiconductor region and the drain pad; and a metal film electrically connected to the gate guard.
    Type: Application
    Filed: June 30, 2021
    Publication date: October 21, 2021
    Applicant: SUMITOMO ELECTRIC DEVICE INNOVATIONS, INC.
    Inventor: Chihoko AKIYAMA
  • Patent number: 11081452
    Abstract: A field effect transistor includes: a semiconductor region including a first inactive region, an active region, and a second inactive region arranged side by side in a first direction; a gate electrode, a source electrode, and a drain electrode on the active region; a gate pad on the first inactive region; a gate guard on and in contact with the semiconductor region, the gate guard being apart from the gate pad and located between an edge on the first inactive region side of the semiconductor region and the gate pad; a drain pad on the second inactive region; a drain guard on and in contact with the semiconductor region, the drain guard being apart from the drain pad and located between an edge on the second inactive region side of the semiconductor region and the drain pad; and a metal film electrically connected to the gate guard.
    Type: Grant
    Filed: February 26, 2020
    Date of Patent: August 3, 2021
    Assignee: SUMITOMO ELECTRIC DEVICE INNOVATIONS, INC.
    Inventor: Chihoko Akiyama
  • Publication number: 20210104610
    Abstract: A semiconductor device includes a substrate, an active region and an inactive region surrounding the active region, a gate electrode, a drain electrode and a source electrode on the active region, a drain interconnection including a drain finger and a drain bar, and a source interconnection including a source finger and a source bar. The source bar is located on an opposite side of the drain bar across the active region in a first direction. The source electrode includes a first side facing the drain bar in the first direction and a first depression in a middle of the first side. A first depth of the first depression in the first direction is equal or more than a first interval between the drain bar and the first side in the first direction.
    Type: Application
    Filed: December 16, 2020
    Publication date: April 8, 2021
    Applicant: SUMITOMO ELECTRIC DEVICE INNOVATIONS, INC.
    Inventor: Chihoko AKIYAMA
  • Patent number: 10903323
    Abstract: A semiconductor device includes a substrate, an active region and an inactive region surrounding the active region, a gate electrode, a drain electrode and a source electrode on the active region, a drain interconnection including a drain finger and a drain bar, and a source interconnection including a source finger and a source bar. The source bar is located on an opposite side of the drain bar across the active region in a first direction. The source electrode includes a first side facing the drain bar in the first direction and a first depression in a middle of the first side. A first depth of the first depression in the first direction is equal or more than a first interval between the drain bar and the first side in the first direction.
    Type: Grant
    Filed: September 5, 2019
    Date of Patent: January 26, 2021
    Assignee: SUMITOMO ELECTRIC DEVICE INNOVATIONS, INC.
    Inventor: Chihoko Akiyama
  • Publication number: 20200279818
    Abstract: A field effect transistor includes: a semiconductor region including a first inactive region, an active region, and a second inactive region arranged side by side in a first direction; a gate electrode, a source electrode, and a drain electrode on the active region; a gate pad on the first inactive region; a gate guard on and in contact with the semiconductor region, the gate guard being apart from the gate pad and located between an edge on the first inactive region side of the semiconductor region and the gate pad; a drain pad on the second inactive region; a drain guard on and in contact with the semiconductor region, the drain guard being apart from the drain pad and located between an edge on the second inactive region side of the semiconductor region and the drain pad; and a metal film electrically connected to the gate guard.
    Type: Application
    Filed: February 26, 2020
    Publication date: September 3, 2020
    Applicant: SUMITOMO ELECTRIC DEVICE INNOVATIONS, INC.
    Inventor: Chihoko AKIYAMA
  • Publication number: 20200091302
    Abstract: A semiconductor device includes a substrate, an active region and an inactive region surrounding the active region, a gate electrode, a drain electrode and a source electrode on the active region, a drain interconnection including a drain finger and a drain bar, and a source interconnection including a source finger and a source bar. The source bar is located on an opposite side of the drain bar across the active region in a first direction. The source electrode includes a first side facing the drain bar in the first direction and a first depression in a middle of the first side. A first depth of the first depression in the first direction is equal or more than a first interval between the drain bar and the first side in the first direction.
    Type: Application
    Filed: September 5, 2019
    Publication date: March 19, 2020
    Applicant: SUMITOMO ELECTRIC DEVICE INNOVATIONS, INC.
    Inventor: Chihoko AKIYAMA