Check digit calculator

Details Check digit calculator Check digit calculator

1978-10-27

1981-06-09

Hix, L. T.

Registers

Calculators

Bar

235124, G06C 2700, G01D 1322

Patent

active

042726743

ABSTRACT:
A calculator for calculating check digits which are obtained from code numbers according to a modulus 10, modulus 11 or similar check. In accordance with one embodiment of the invention, the desired check digit original numerals are indicated in response to the determination of a code number and weights and the desired check digit is readily obtained from the sum of the check digit original numerals. In accordance with another embodiment, the desired check digit is directly indicated in response to the setting of a code number. In accordance with still another improved embodiment, the desired check digit according to the modulus 10 and that according to the modulus 11 are selectively indicated in response to the setting of a code number.

REFERENCES:
patent: 349459 (1886-09-01), Shattuck et al.
patent: 713444 (1902-11-01), Johnson
patent: 983682 (1911-02-01), Cheape
patent: 1088889 (1914-03-01), Falvey et al.
patent: 1619230 (1927-03-01), Wright
patent: 1777692 (1930-10-01), Fuss
patent: 2550675 (1951-05-01), Curtis
patent: 2732130 (1956-01-01), Rosenberg
patent: 2950048 (1960-08-01), Luhn
patent: 3281071 (1966-10-01), Curran
patent: 3785553 (1974-01-01), Brown

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