Electrically impedant articles

Details Electrically impedant articles Electrically impedant articles

1979-05-17

1982-01-26

Albritton, C. L.

Electrical resistors

Flexible or folding

Tape or sheet

219548, 219549, 338 22R, H01C 306, H01C 700

Patent

active

043131018

ABSTRACT:
An electrically impedant article comprising an electrode embedded in a polymeric body having dispersed therein electrically conducting carbon black in which the body around the electrode contains a lower percentage of conductive carbon black than do other regions of the body further away from the electrode, the carbon black in said region around the electrode being of higher conductivity than the carbon black in said other regions. The polymeric body preferably comprises a silicone rubber. The article can be a heating tape having a pair of spaced parallel electrodes and may have a positive non-linear temperature co-efficient of impedance.

REFERENCES:
patent: 2861163 (1958-11-01), Asakawa
patent: 3096210 (1963-07-01), Boonstra
patent: 3166688 (1965-01-01), Rowand et al.
patent: 3435401 (1969-03-01), Epstein
patent: 3666876 (1972-05-01), Forster
patent: 3793716 (1974-02-01), Smith-Johannsen
patent: 3858144 (1974-12-01), Bedard et al.
patent: 3861029 (1975-01-01), Smith-Johannsen et al.
patent: 4020014 (1977-04-01), Service et al.
patent: 4055526 (1977-10-01), Kiyokawa et al.
patent: 4177376 (1979-12-01), Horsma

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