Registers – Calculators – Input-output calculator to indicator – printer – etc.
Patent
1976-03-02
1977-07-12
Canney, Vincent P.
Registers
Calculators
Input-output calculator to indicator, printer, etc.
235 6112M, G06K 714, G06K 1906, G01N 2130
Patent
active
040356230
ABSTRACT:
A method of recording machine-readable security data on a record medium, such as a cash dispenser card, is described in which the security data is deposited on the record medium as a sequence of magnetic characters. The characters may include a first magnetic character which when scanned in a given direction by a magnetic pick-up head having a sensing gap generates a characteristic signal exceeding a first threshold level in a positive direction but not exceeding a second lower threshold level in a negative direction, a second magnetic character which when scanned in the said given direction by a magnetic pick-up head having a sensing gap generates a characteristic signal exceeding the second lower threshold level in a negative direction but not exceeding the first threshold level in a positive direction, and/or a third magnetic character which when scanned in the said given direction generates a characteristic signal exceeding both the first threshold level in a positive direction and the second threshold level in a negative direction. The first and second characters may comprise left-handed and right-handed right-angled triangles respectively and the third character may comprise a rectangle. The invention permits the recording off of any desired binary sequence by arranging that the first character represents a binary "1" and the second character represents a binary "0".
REFERENCES:
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patent: 3723710 (1973-03-01), Crouse
patent: 3749889 (1973-07-01), Vaskunes et al.
patent: 3753255 (1973-08-01), Di Vero
patent: 3812328 (1974-05-01), Tramposch
patent: 3818446 (1974-06-01), Benson
patent: 3891831 (1975-06-01), Coles, Jr.
Eastell Robert W.
Harrison John
Sharples Allan
Canney Vincent P.
McCorquodale & Company Limited
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