Patents Assigned to Polytel Corporation
  • Capacitive multikey keyboard for inputting data into a computer
    Patent number: 4616213
    Abstract: A multikey keyboard for inputting data into a computer, wherein pressing a key places in circuit the point of intersection of a row conductor and column conductor respectively connected to portions of separate row and column sequential series of capacitors whose cumulative capacitance correspond to the specific row and columns of the pressed key, thus allowing the computer to establish which key was pressed by measuring the capacitance between the events involving said completed keyboard circuits.
    Type: Grant
    Filed: January 14, 1983
    Date of Patent: October 7, 1986
    Assignee: Polytel Corporation
    Inventor: Sherif Danish