Patents by Inventor Toshihiko Sawai

Toshihiko Sawai 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).

  • Electron tube including aluminum seal ring
    Patent number: 5594301
    Abstract: An electron tube, such as, a photomultiplier, includes an aluminum seal ring 4 disposed between a Kovar cylinder 1, and a quartz faceplate 5 having a photocathode 6. The electron tube further includes a borosilicate stem plate 2, an anode 8, and a dynode 7. The aluminum seal ring 4 provides for increased air tightness, reliability, quantum efficiency, and gain.
    Type: Grant
    Filed: January 22, 1996
    Date of Patent: January 14, 1997
    Assignee: Hamamatsu Photonics K.K.
    Inventors: Toshihiko Sawai, Masayuki Inuzuka, Toyohiko Terada
  • Optical window and radiation position-sensitive detector using the same
    Patent number: 4960997
    Abstract: An optical window comprises a plurality of glass members and a plurality of reflective members each being formed between the adjacent glass members. Each reflective member is made of a glass medium which is the same as the glass member and grain regions made of a material having large reflectance and interspersed in the glass medium. A radiation position-sensitive detector comprises a scintillator, the optical window of the invention, and a multi-anode type photomultiplier tube which has a plurality of photomultipliers.
    Type: Grant
    Filed: January 18, 1989
    Date of Patent: October 2, 1990
    Assignee: Hamamatsu Photonics Kabushiki Kaisha
    Inventors: Mitsuo Watanabe, Toshihiko Sawai