Fractional calculator

Details Fractional calculator Fractional calculator

1983-02-10

1985-10-01

Heyman, John S.

Boots, shoes, and leggings

235145R, 235310, 364710, G06F 314, G06F 738

Patent

active

045450226

ABSTRACT:
A fractional calculator (10) has a keyboard (12) with numeral keys (18) and denominator keys (20). Through use of the numeral keys (18) and the denominator keys (20), fractional inputs may be entered into the calculator and calculations carried out on the inputs through use of function keys (22). A decimal/U.S. toggle key (26) allows the calculator to be used in either a conventional decimal mode or a fractional mode. When the calculator is used in a fractional mode, key (30) is used to differentiate between integers and numerators of fractions entered by means of the numeral keys (18). Key (28) may be used to distinguish between feet and inches in mixed unit entries during fractional mode operation. Display (14) includes indicators (38, 39, 40, 42, 44) for different modes of operation and different types of entries.

REFERENCES:
patent: 3973113 (1976-08-01), Goldsamt
patent: 3978328 (1976-08-01), Fabry et al.
patent: 4064398 (1977-12-01), Kishimoto et al.
patent: 4081859 (1978-03-01), Goldsamt et al.
patent: 4481598 (1984-11-01), Ishiwata

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