Patents Assigned to Leona Electronics Co., Ltd.
  • Calculator
    Patent number: 4892999
    Abstract: A see-through calculator or memory device comprises a transparent base, a see-through printed circuit board and a transparent switch panel. Liquid is housed in a cavity in the base, formed by welding to the base a panel above a recess in the base.
    Type: Grant
    Filed: July 15, 1988
    Date of Patent: January 9, 1990
    Assignee: Leona Electronics Co., Ltd.
    Inventor: Ho Wai-Kwan