Patents by Inventor Hiromi Koyama

Hiromi Koyama 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: 9236460
    Abstract: A semiconductor device is disclosed. The semiconductor device is capable of obtaining a high reverse recovery resistant amount by allowing sheet resistance of a peripheral portion in a p type diffusion region that is in contact with a metal electrode through an insulating film on a surface to be as high as possible and reducing an increase in cost if possible. The semiconductor device includes: a p type diffusion region that is disposed in a surface layer of the one main surface of an n type semiconductor substrate; and a voltage-resistant region that surrounds the p type diffusion region.
    Type: Grant
    Filed: May 16, 2013
    Date of Patent: January 12, 2016
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventors: Hiromi Koyama, Takashi Shiigi, Akihiro Fukuchi, Seiji Momota, Toshiyuki Matsui
  • Publication number: 20130307019
    Abstract: A semiconductor device is disclosed. The semiconductor device is capable of obtaining a high reverse recovery resistant amount by allowing sheet resistance of a peripheral portion in a p type diffusion region that is in contact with a metal electrode through an insulating film on a surface to be as high as possible and reducing an increase in cost if possible. The semiconductor device includes: a p type diffusion region that is disposed in a surface layer of the one main surface of an n type semiconductor substrate; and a voltage-resistant region that surrounds the p type diffusion region.
    Type: Application
    Filed: May 16, 2013
    Publication date: November 21, 2013
    Applicant: FUJI ELECTRIC CO., LTD.
    Inventors: Hiromi KOYAMA, Takashi SHIIGI, Akihiro FUKUCHI, Seiji MOMOTA, Toshiyuki MATSUI
  • Patent number: 5088781
    Abstract: A handle structure includes a handle lever and a grip member in latched engagement with the handle lever. The grip member has a recess formed therein and includes a sleeve-like outer member and an inner member received in the outer member. The inner and outer members are detachably engaged with one another, and the inner member is detachably engaged with the handle lever by a latch pawl that engages with a latch opening in the handle lever. The upper latch pawl is exposed to the outside of the grip member through a window opening formed in the outer member and the latch opening. The engagement between the inner member and the handle lever can be released through the window opening.
    Type: Grant
    Filed: January 8, 1991
    Date of Patent: February 18, 1992
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Tomio Ono, Hiromi Koyama
  • Patent number: 5088777
    Abstract: A lock device for locking a detachable roof to a car body, which a housing mounted to the detachable roof, the housing defining a certain clearance through which the interior of the housing is exposed to the outside of the housing; a handle lever including a base portion pivotally arranged in the housing and a grip portion projected into the outside of the housing, the base portion being formed with a curved guide slot which has at least a locking part; a lock member linked to the handle lever in such a manner that, when the handle lever is pivoted to a lock position, the lock member becomes operative and, when the handle lever is pivoted to an unlock position, the lock member becomes inoperative; a guide pin movably received in the housing and slidably engaged with the curved guide slot of the handle lever, the guide pin suppressing the handle lever from pivoting from the lock position toward the unlock position when received in the locking part of the guide slot; a slide member incorporated with the guide p
    Type: Grant
    Filed: January 8, 1991
    Date of Patent: February 18, 1992
    Assignees: Nissan Motor Co., Ltd., Ohi Seisakusho Co., Ltd.
    Inventors: Tomio Ono, Ryo Tsuruo, Hiromi Koyama, Ryoji Fujihara