Browse Prior Art Database

Permanent Encoding Magnetizable Stripes

IP.com Disclosure Number: IPCOM000074342D
Original Publication Date: 1971-Apr-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Herron, TF: AUTHOR

Abstract

Credit cards or tickets with magnetizable stripes are permanently encoded by a matrix of selectively extendable encoding wires that depress the magnetic material to create dot indentations that provide a null signal when the stripe is magnetically sensed.

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Permanent Encoding Magnetizable Stripes

Credit cards or tickets with magnetizable stripes are permanently encoded by a matrix of selectively extendable encoding wires that depress the magnetic material to create dot indentations that provide a null signal when the stripe is magnetically sensed.

Card or ticket 11 (see A) is positioned between die base 12 and encoder 13. Wires 14 about 0.030 inch in diameter are arranged in a matrix within respective tubular guides 15 and selectively extendable approximately 0.030 inch toward corresponding aligned recesses 16 in 12 to physically displace magnetic material in magnetizable stripe 17 on 11, when 17 is positioned therebetween. When the stripe is later presaturated and then read, a null or significantly lowered signal will occur wherever 17 was depressed. A 2 x 3 matrix of wires (see
B) provides six plunger positions 1-6, enabling this alphanumeric code: 0 = 0 A = 15 K = 36 U = 245 1 = 1 B = 16 L = 126 V = 246 2 = 2 C = 123 M = 45 W = 256 3 = 3 D = 23 N = 46 X = 1234 4 = 4 E = 24 O = 126 Y = 1235 5 = 5 F = 25 P = 56 Z = 1236 6 = 6 G = 26 Q = 136 Space = 1246 7 = 12 H = 124 R = 234 Period = 1256 8 = 13 I = 34 S = 235 Comma = 1345 9 = 14 J = 35 T = 236 Sum = 1456 Start Start = 123456.

At the end of the encoded data, all message bits between a start symbol and sum symbol could be summed and the resultant added as a suffix as a checking feature, as in C.

If desired, wires 14 can be suitably heated to facilitate penetration...