Communications: electrical – Systems – Call station
Patent
1975-10-21
1977-07-12
Swann, III, Glen R.
Communications: electrical
Systems
Call station
73362AR, 126273R, 324 65P, 340409, G08B 1900, G08B 2900
Patent
active
040357872
ABSTRACT:
Food temperature responsive apparatus for controlling an oven. The apparatus includes a temperature sensing thermistor which may be included in a probe adapted for insertion into food being cooked in an oven. The apparatus includes simplified and effective means, in the form of voltage dividers and comparators, for performing the functions of de-energizing the oven heating means and energizing an audible alarm when interior food temperature reaches a preset temperature, protecting against an open-circuited or a short-circuited condition in a sensing circuit which includes the thermistor, guarding against responding to transient electrical noise, and latching the oven heating means in a de-energized condition once it has been de-energized. Even though the thermistor has a non-linear resistance versus temperature characteristic, the apparatus provides a linear temperature presetting scale and includes a linear temperature presetting potentiometer.
REFERENCES:
patent: 2510526 (1950-06-01), Smith
patent: 3201991 (1965-08-01), Mansberg
patent: 3581300 (1971-05-01), Eloranta
patent: 3611336 (1971-10-01), Chen
patent: 3667476 (1972-06-01), Muller
patent: 3671817 (1972-06-01), Seipp
patent: 3767937 (1973-10-01), Schmidgall
patent: 3806921 (1974-04-01), Pappas
patent: 3859644 (1975-01-01), Main
patent: 3883753 (1975-05-01), Harrison, Jr. et al.
Boos Francis H.
General Electric Company
Schnedler Steven C.
Swann III Glen R.
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