Patents by Inventor Tetuji Hirao

Tetuji Hirao 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).

  • Short arc type super high pressure discharge lamp
    Patent number: 7170229
    Abstract: A short arc type super high pressure discharge lamp has a pair of electrodes, a light emitting portion in which greater than 0.15 mg/mm3 of mercury is enclosed, and sealing portions provided on both sides of the light emitting portion, wherein at least one of the pair of electrodes has a thick portion which extends into one of the sealing portions and a coil is wound around the thick portion in the one of the sealing portion via a gap.
    Type: Grant
    Filed: April 21, 2004
    Date of Patent: January 30, 2007
    Assignee: Ushio Denki Kabushiki Kaisha
    Inventor: Tetuji Hirao
  • Short arc type super high pressure discharge lamp
    Publication number: 20040256992
    Abstract: A short arc type super high pressure discharge lamp has a pair of electrodes, a light emitting portion in which greater than 0.15 mg/mm3 is enclosed, and sealing portions provided on both side of the light emitting portion, wherein at least one of the pair of electrodes has a thick portion which extends into one of the sealing portions and a coil is wound around the thick portion in the one of the sealing portion via gap.
    Type: Application
    Filed: April 21, 2004
    Publication date: December 23, 2004
    Inventor: Tetuji Hirao