Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1982-09-27
1984-02-21
McCarthy, Helen M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
106 85, 252506, 252508, 252509, 252511, 315 58, 501 32, 501 44, 501 58, 501 59, 501 65, 501 66, 501 77, 524588, H01C 700, C03C 308, C03C 316
Patent
active
044330928
ABSTRACT:
A lead-free green ceramic body useful after firing as an electrical resistor, and a method for producing such a resistor, are disclosed. The method preferably comprises the steps of preparing a uniform, finely-divided mixture by blending, by weight, substantially 69 percent of a glass frit with substantially 8 percent of AlPO.sub.4, substantially 3 percent of conductive carbon and substantially 20 percent of a phenyl lower alkyl silicone resin which is curable to form a temporary binder for the conductive carbon and the glass frit. One preferred frit consists essentially of substantially 43 percent SiO.sub.2, 20 percent B.sub.2 O.sub.3, 21 percent Na.sub.2 O, 3 percent CaO, 8 percent BaO and 5 percent Li.sub.2 O. A shape is then pressed from the mixture; the shape is heated to 450-550 degrees F. for about 30 minutes and cooled to ambient temperature. Silver paint is then applied to the cooled shape and the painted shape is fired to vitrify the frit of the resistor. A lead-free carbon resistor according to the invention eliminates health hazards of human exposure to toxic lead compounds used in many resistors. A preferred resistor according to the invention also maintains an essentially constant resistance over time.
REFERENCES:
patent: 2459282 (1949-01-01), McDougal et al.
patent: 2526059 (1950-10-01), Zabel et al.
patent: 2536962 (1951-01-01), Sorg
patent: 3382574 (1968-05-01), Chadwick
patent: 3627551 (1971-12-01), Olstowski
patent: 3742423 (1973-06-01), Chadwick
patent: 3909459 (1975-09-01), Friese et al.
patent: 3931084 (1976-01-01), Buckley et al.
patent: 4046581 (1977-09-01), Cassidy
patent: 4051074 (1977-09-01), Asada
patent: 4173731 (1979-11-01), Takagi et al.
patent: 4345179 (1982-08-01), Asai et al.
Champion Spark Plug Company
McCarthy Helen M.
Purdue John C.
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