Boots – shoes – and leggings
Patent
1980-06-04
1983-01-25
Malzahn, David H.
Boots, shoes, and leggings
364709, G06F 305, G06F 1542
Patent
active
043707270
ABSTRACT:
The present invention is intended to solve the problem of the reliable acquisition of accurate temperature data for a miniature calculator provided for the application of family planning methods. The calculator is provided with a receptacle removably carrying a thermometric probe for providing the temperature measurement in a digital form. The circuits of the probe comprise an oscillator including a temperature responsive resistance element to be placed in contact with the area of the temperature to be measured, Tx. The output frequency fx of this oscillator is a function of Tx, and is measured by a counter controlled by a signal formed from a reference frequency fr provided by a reference oscillator and further provided to a frequency divider. A comparator compares the contents of the counter to that of a memory, and in case the counter contents is higher than the stored contents, the comparator controls the entry thereof to the memory so that the probe operates as a maximum thermometer. The contents of the memory is read in serial fashion by the system of the calculator when the probe is replaced into its receptacle.
REFERENCES:
patent: 3940742 (1976-02-01), Hudspeth et al.
patent: 3978325 (1976-08-01), Goldstein et al.
patent: 3999050 (1976-12-01), Pitroda
patent: 4151596 (1979-04-01), Howells
Bioself International Inc.
Malzahn David H.
LandOfFree
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