Electrical resistors – Resistance value responsive to a condition – Current and/or voltage
Patent
1991-10-30
1994-01-18
Lateef, Marvin M.
Electrical resistors
Resistance value responsive to a condition
Current and/or voltage
338 22SD, 252502, H01C 710
Patent
active
052802639
ABSTRACT:
A PTC element displaying low volume resistivity and excellent PTC characteristics contains conductive carbonaceous particles having a large particle size, small specific surface area and being essentially unstructured such particles being, for example, thermal black or mesocarbon microparticles. The conductive particles are heat treated in an inactive atmosphere, blended with a crystalline polymer and then cross-linked by gamma radiation. In a variant form, the polymer can be chemically grafted onto the particles. The very low resistivity and excellent PTC characteristics of this PTC device make it suitable for miniaturization.
REFERENCES:
patent: 4545926 (1985-10-01), Fouts, Jr. et al.
patent: 4560524 (1985-12-01), Smuckler
patent: 4910389 (1990-03-01), Sherman et al.
Daito Communication Apparatus Co. Ltd.
Lateef Marvin M.
Morrison Thomas R.
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