Registers – Calculators – Tabular
Patent
1985-05-20
1986-11-25
Fuller, Benjamin R.
Registers
Calculators
Tabular
235 78RC, G06C 300
Patent
active
046250999
ABSTRACT:
There is disclosed a calculator adapted to determine optimum monthly fertility time periods of a female formed by a first scale divided into 365 equal units, each unit assigned a day and each month of a full calendar year, a second scale positioned in operative relation to the first scale, the second scale including a plurality of information segments, each of the information segments being sized to correspond with a different menstrual cycle length calculated by the time period between the first day of successive menstrual cycles and ranging between 23 cycle days and 35 cycle days, each of the information segments being spaced from the next adjacent information segment by a spacer segment, each of the spacer segments being of equal size, and each information segment further provided with an optimum fertility indicator segment sized in accordance with a time period equal to two days prior and two days following ovulation, whereby the manipulation of the second scale by placing the indicator indicating the first day of a menstrual cycle of a given cycle length in registry with a particular day and month as noted on the first scale, the optimum fertility indicator formed on the second scale will be automatically positioned with respect to certain days of certain months on the first scale thereby to alert the user as to the optimum fertility time period for conception.
REFERENCES:
patent: 3278118 (1966-10-01), Klein, Jr.
patent: 3279696 (1966-10-01), Sherman
patent: 3289324 (1966-12-01), Benson
patent: 3929279 (1975-12-01), Dibley
Demeur Basil E.
Fuller Benjamin R.
Knechtel Robert E.
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