Patents by Inventor Tomonori Okabe

Tomonori Okabe 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).

  • Lamp circuit with disconnected lamp detecting device
    Patent number: 5099177
    Abstract: A plurality of current transformers connected in series provide secondary winding sides respectively connected to lamps. A constant-current source is provided to supply constant current to these lamps. Each lamp is connected to the corresponding terminal unit including a short-circuit switch for short-circuiting the secondary winding side of the transformer when the lamp is disconnected. A master station issues a request for detecting a disconnected lamp or checking whether or not failure occurs in the terminal unit to each terminal unit in the form of an instant power interruption. Each terminal unit has a proper identification time assigned thereto.
    Type: Grant
    Filed: March 5, 1991
    Date of Patent: March 24, 1992
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Shozo Taniguchi, Tomonori Okabe, Ryoji Doya, Kazutoyo Narita, Kiyoshi Noda, Katsuyuki Ueda