Electronic calculator

Details Electronic calculator Electronic calculator

1978-02-21

1980-08-12

Atkinson, Charles E.

Boots, shoes, and leggings

35 31C, 364737, G09B 1902

Patent

active

042176565

ABSTRACT:
An electronic calculator comprises a keyboard for receiving numerical data, storage registers for storing the numerical data, a processor unit for processing the numerical data stored in the storage registers, a display unit for visually displaying the numerical data, a blocking circuit for blocking the visual display of a computed result from the processor unit, and a releasing circuit to discontinue the blocking of the visual display of the result, thereby causing the operator of the calculator to not know the result until receiving instructions.

REFERENCES:
patent: 2700755 (1955-01-01), Burkhart
patent: 3584398 (1971-06-01), Meyer et al.
patent: 3612843 (1971-10-01), Aptroot-Soloway
patent: 3699667 (1972-10-01), Gomez
patent: 3787988 (1974-01-01), Nakajima et al.
patent: 3854226 (1974-12-01), Divine et al.
patent: 3925909 (1975-12-01), Duncan
patent: 3947976 (1976-04-01), Hafel
patent: 3974575 (1976-08-01), Duncan
patent: 4016411 (1977-04-01), Genin
patent: 4114294 (1978-09-01), Marmer
patent: 4126949 (1978-11-01), Simone

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