Circuit protection devices

Details Circuit protection devices Circuit protection devices

1980-04-21

1982-02-23

Mayewsky, Volodymyr Y.

Electric heating

Heating devices

With heating unit structure

219505, 219510, 219548, 252511, 264105, 338 22R, 338212, H05B 310

Patent

active

043170277

ABSTRACT:
Electrical devices which comprise two planar electrodes and a conductive polymer element, at least a part of which is a PTC element. The conductive polymer element has an intermediate portion of increased resistance, resulting from the presence of insulating or high resistance portions within the conductive polymer element, so that when a hot zone is formed in the PTC element, it is located at or near the intermediate portion, away from the electrodes.

REFERENCES:
patent: 3351882 (1967-11-01), Kohler et al.
patent: 4017715 (1977-04-01), Whitney et al.
patent: 4177376 (1979-12-01), Horsma et al.
patent: 4177446 (1979-12-01), Diaz
patent: 4238812 (1980-12-01), Middleman et al.
"Investigation of Current-Interruption by Metal Filled Epoxy Resin" by Littlewood and Briggs, J. Phys. D: Appl. Phys., vol. II, 1978, pp. 1457-1462.
"PTC Resistor", R. F. Blaha, Proceedings of the Electronic Components Conference, 1971, pp. 44-50.
"Solid State Bistable Power Switch Study", H. Shulman and J. Bartko, Aug. 1968, National Aeronautics and Space Administration, under Contract No. NAS 12-647.

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