Electrical resistors – Resistance value responsive to a condition – Current and/or voltage
Patent
1988-03-14
1990-07-24
Miller, Jr., George H.
Electrical resistors
Resistance value responsive to a condition
Current and/or voltage
338 20, 361120, 200148B, H01C 710
Patent
active
049437950
ABSTRACT:
A composite sintered oxide resistor comprising crystal grains of zinc oxide and crystal grains of a zinc oxide compound of other metal or semi-metal element than zinc, and a grain boundary layer having an electric resistance equal to or lower than that of the crystal grains of zinc oxide between the individual crystal grains and which has a very large withstanding capacity against switch surge, a small non-linear coefficient of voltage in the voltage-current characteristics, a positive, smaller resistance-temperature coefficient, and a small percent change in resistivity after heat treatment at 500.degree. C. in the atmosphere.
REFERENCES:
patent: 4219862 (1980-08-01), Nitta et al.
patent: 4276578 (1981-06-01), Levinson et al.
patent: 4285839 (1981-08-01), Wong
patent: 4319215 (1982-03-01), Yamazaki et al.
patent: 4460497 (1984-07-01), Gupta et al.
patent: 4658324 (1987-04-01), Inaba
"The Physics of Metal Oxide Varistors", Levinson et al., Journal of Applied Physics, vol. 46, No. 3, pp. 1332-1334, Mar. 1975.
Kosugi Tetsuo
Ogihara Satoru
Owada Shinichi
Shirakawa Shingo
Yamazaki Takeo
Hitachi , Ltd.
Lateef Marvin M.
Miller Jr. George H.
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