Secret coded card system

• US 3,312,372 A
• Filed: 05/28/1964
• Issued: 04/04/1967
• Est. Priority Date: 05/28/1964
• Status: Expired due to Term

• Current Assignee: Irving B. Cooper Jr
• Original Assignee: Irving B. Cooper Jr
• Inventors: Cooper, Irving B. Jr.
• Application Number:
  US04/370,843
• Time in Patent Office: 1,041 Days
• US Class Current: 222/2
• CPC Class Codes: G06K 7/087 flux-sensitive, e.g. magnetic, detectors G06K7/10336 takes precedence
• CPC Class Codes: G06Q 20/342 Cards defining paid or billed services or quantities
• CPC Class Codes: G07F 7/025 by means, e.g. cards, providing billing information at the time of purchase, e.g. identification of seller or purchaser, quantity of goods delivered or to be delivered

Claims

1. A CODED CARD READER HAVING AN A.C. POWER SUPPLY AND INCLUDING AN E-CORE TRANSFORMER HAVING A CENTER LEG AND A PAIR OF OUTER LEGS FOR PROVIDING TWO MAGNETIC FLUX PATHS INCLUDING THE CENTER LEG IN COMMON, A FLUX SENSING COIL ON SAID CENTER LEG AND EXCITATION WINDINGS FOR PRODUCING EQUAL FLUX IN EACH OF THE MAGNETIC FLUX PATHS, SAID FLUX BEING OPPOSITELY DIRECTED IN THE CENTER LEG OF THE TRANSFORMER, AND A SECOND TRANSFORMER ENERGIZED BY SAID POWER SUPPLY IN PARALLEL WITH THE E-CORE TRANSFORMER, SAID SECOND TRANSFORMER HAVING A SECONDARY WINDING TO PRODUCE SIGNALS RESPONSIVE TO THE PHASE VARIATIONS OF THE POWER SUPPLY TO PROVIDE A REFERENCE FOR THE POLARITY OF ANY SIGNAL PRODUCED BY SAID SENSING COIL UPON THE DISTORTION OF THE FLUX IN ONE OF THE MAGNETIC FLUX PATHS RELATIVE TO THE OTHER.