Patents by Inventor Iwao Hirayama

Iwao Hirayama 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: 5838644
    Abstract: An electroluminescent display which is simple to manufacture and which is capable of high luminance consists of a transparent electrode disposed on a transparent substrate. On the transparent electrode are sequentially laminated layers including a fluorescent print pattern layer, a luminescent layer, an insulating layer and a rear electrode layer. The fluorescent layer is preferably formed of a fluorescent pigment and a fluoride resin binder and is provided at a portion of the electroluminescent display at which a display is to be created, such as the time indicating indicia on the dial of a timepiece. In a preferred embodiment, the electroluminescent display is provided as a timepiece dial and has a central hole therethrough for providing shafts for driving an hour hand, a minute hand and a second hand.
    Type: Grant
    Filed: October 27, 1995
    Date of Patent: November 17, 1998
    Assignee: Seiko Precision Inc.
    Inventors: Koji Yoneda, Koji Hirose, Shigehiko Aoki, Iwao Hirayama