Patents Assigned to Kyokuto Electric Co., Ltd.
  • Card or book involving luminescence
    Patent number: 4286399
    Abstract: At least one of two openable leaves is provided with at least one light-emitting diode, a thin battery for lighting the diode and a switch assembly. On opening the leaves, the diode emits light, which is extinguished when the leaves are closed to provide an indication of unique interest.
    Type: Grant
    Filed: March 19, 1980
    Date of Patent: September 1, 1981
    Assignees: Matsushita Electric Industrial Co., Ltd., Kyokuto Electric Co., Ltd.
    Inventors: Masao Funahashi, Shigeru Maeda