Electric heating – Heating devices – Combined with diverse-type art device
Patent
1981-01-12
1984-06-19
Envall, Jr., Roy N.
Electric heating
Heating devices
Combined with diverse-type art device
5284, 5421, 219364, 219359, 219502, H05B 354
Patent
active
044554729
ABSTRACT:
A bed heater with two spaced, perforated, non-metallic plates between which there is arranged spaced loops of an insulated cover-type resistance heating fuse wire. At least some side area between the plates is open allowing lateral movement of air to prevent overheating. Power is supplied through a parallel SCR and diode circuit controlled by an R-C circuit including a temperature responsive resistor and a light responsive resistor.
REFERENCES:
patent: 1570162 (1926-01-01), McKeehan et al.
patent: 2452234 (1948-10-01), Gerdes
patent: 2565390 (1951-08-01), Mitnowsky
patent: 3352490 (1967-11-01), Dalzell et al.
patent: 3882363 (1975-05-01), Misencik
Envall Jr. Roy N.
Phillips C. A.
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