×

Magnetic data reader employing magnetically operated solid state switches, and reader-lock combination

  • US 3,995,145 A
  • Filed: 03/07/1975
  • Issued: 11/30/1976
  • Est. Priority Date: 03/07/1975
  • Status: Expired due to Term
First Claim
Patent Images

1. An apparatus for electronically sensing at least one magnetized portion of a card, comprising:

  • a magnet and a solid state switching element mounted in relatively close proximity to one another;

    said switching element having at least two distinct states;

    said switching element being normally in one of its said states in the absence of a magnetic field from a specific magnet pole of at least a predetermined strength;

    said switching element being changeable to its other state when a magnetic field of at least a predetermined magnetic strength from a magnetic pole of specific polarity is moved into relatively close proximity therewith; and

    means for receiving a card having a magnetized portion therein for moving said magnet into sufficiently close proximity with said switching element to change said switching element from one of its states to the other of its states.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×