Patents by Inventor Yasuo Kadota

Yasuo Kadota 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).

  • Bipolar transistor with reduced collector resistance
    Patent number: 5109262
    Abstract: A bipolar transistor in which a base region and a collector lead-out portion is separated is disclosed. The base region and an active collector portion under the base region is surrounded by a narrow trench filling an insulating film, and the trench is in turn surrounded by the collector lead-out portion. A collector electrode is contacted to the upper surface of the collector lead-out portion such that the collector contact surrounds the active collector portion via the trench, in the plan view.
    Type: Grant
    Filed: August 10, 1990
    Date of Patent: April 28, 1992
    Assignee: NEC Corporation
    Inventors: Yasuo Kadota, Junzoh Shimizu
  • Method of manufacturing a bipolar transistor
    Patent number: 5039624
    Abstract: A bipolar transistor having an intrinsic base portion for forming emitter-base PN junction with an emitter region and an extrinsic base portion for connecting a base electrode is disclosed. A concavity is formed between the intrinsic and extrinsic base portions, and the intrinsic base portion is electrically connected to the base electrode through a passage formed under the concavity and through the extrinsic base portion. The emitter region is contacted at its side to an insulating film formed in the concavity.
    Type: Grant
    Filed: April 26, 1989
    Date of Patent: August 13, 1991
    Assignee: NEC Corporation
    Inventor: Yasuo Kadota
  • Method of manufacturing bipolar transistor
    Patent number: 4980305
    Abstract: A bipolar transistor in which a base region and a collector lead-out portion is separated is disclosed. The base region and an active collector portion under the base region is surrounded by a narrow trench filling an insulating film, and the trench is in turn surrounded by the collector lead-out portion. A collector electrode is contacted to the upper surface of the collector lead-out portion such that the collector contact surrounds the active collector portion via the trench, in the plan view.
    Type: Grant
    Filed: June 26, 1989
    Date of Patent: December 25, 1990
    Assignee: NEC Corporation
    Inventors: Yasuo Kadota, Junzoh Shimizu