Doubly-controlled aquarium safety heater

Details Doubly-controlled aquarium safety heater Doubly-controlled aquarium safety heater

1990-12-24

1992-05-12

Walberg, Teresa J.

Electric heating

Heating devices

With heater-unit housing, casing, or support means

219497, 219506, 392498, 392447, H05B 380, H05B 102

Patent

active

051130572

ABSTRACT:
An aquarium heater includes a heating coil and a thermostat formed in a glass tube, a thermo-sensitive resistor distantly connected to the thermostat for ensuring a reliable sensing of water temperature in the aquarium without being thermally influenced by the heating coil, and a thermal type circuit breaker provided in a circuit of the thermostat and the heating coil for safely switching off a power supply to the heating coil once the thermostat is out of order to prevent killing of fishes raised in the aquarium.

REFERENCES:
patent: 1981251 (1934-11-01), Roth
patent: 3107290 (1963-10-01), Willinger
patent: 3746836 (1973-07-01), Summerfield
patent: 3803386 (1974-04-01), Rodrigues
patent: 3890486 (1975-06-01), Fitzgerald
patent: 3895217 (1975-07-01), Hall
patent: 3896289 (1975-07-01), Di Renna
patent: 4021643 (1977-05-01), Hall
patent: 4072847 (1978-02-01), Craven
patent: 4379220 (1983-04-01), Middleman

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