Patents by Inventor Atsushi Takekiyo

Atsushi Takekiyo 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).

  • Power feeding apparatus for discharge lamp
    Patent number: 6838838
    Abstract: In a power feeding apparatus, current flowing through the discharge lamp is controlled not to exceed a current limit value. Until the discharge status changes to the arc discharge, the current limit value is a first current limit value, and after that, the current limit value changes to the second current limit value. The first current limit value is 70% of the second current limit value or less, and further, for 0.2 ms or greater, the first current limit value is maintained after the discharge status changes to the arc discharge.
    Type: Grant
    Filed: May 28, 2003
    Date of Patent: January 4, 2005
    Assignee: Ushio Denki Kabushiki Kaisha
    Inventors: Masashi Okamoto, Minoru Fukuda, Atsushi Takekiyo
  • Power feeding apparatus for discharge lamp
    Publication number: 20030222605
    Abstract: The object of the present invention is to provide a power feeding apparatus without having a problem that the life time of the lamp is shortened when the discharge status changes to arc discharge.
    Type: Application
    Filed: May 28, 2003
    Publication date: December 4, 2003
    Inventors: Masashi Okamoto, Minoru Fukuda, Atsushi Takekiyo