Patent US3970983A successfully refreshed from Google Patents.
US3970983A
Expired / Lapsed
US
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Resistor with low temperature coefficient
Assignee: Advantest Corp
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Filing: 1975-01-27
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Granted: 1976-07-20
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Expires: 1995-01-27
Abstract
Abstract A resistor with a low temperature coefficient comprises, by way of example, a main wire wound resistor having a low temperature coefficient on the order of -4.0 PPM and a resistance on the order of 1 KΩ connected in series with an auxiliary resistor having a temperature coefficient the magnitude of which is substantially greater than that of the main resistor and the polarity of which is opposite to that of the latter, for example, on the order of 4000 PPM and having a resistance which is greatly reduced as compared with that of the main resistor, for example, on the order of 1Ω. The composite resistor has a resistance of approximately 1 KΩ and a temperature coefficient which is less than 0.5 PPM.
Inventors
- 👤 Isao Hayasaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:47
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
109 words
A resistor having a low thermal coefficient comprising a main wire resistor having a thermal coefficient of α 1 , and an auxiliary resistor having a value of resistance less than that of said main resistor connected in series with the main wire resistor, said auxiliary resistor having a thermal coefficient of α 2 which is of opposite sign to that of α 1 , the resistance value of said auxiliary resistor being R 0 α 1 /α 2 , where R 0 represents the composite series resistance of the main wire resistor and the auxiliary resistor, and where the ratio α 1 /α 2 does not exceed 0.01.
Claim 2
Dependent Claim
109 words
A resistor having a low thermal coefficient comprising a main wire resistor having a thermal coefficient of α 1 , and an auxiliary resistor having a value of resistance less than that of said main resistor connected in series with the main wire resistor, said auxiliary resistor having a thermal coefficient of α 2 which is of opposite sign to that of α 1 , the resistance value of said auxiliary resistor being R 0 α 1 /α 2 , where R 0 represents the composite series resistance of the main wire resistor and the auxiliary resistor, and where the ratio α 1 /α 2 does not exceed 0.01.
Claim 3
Dependent Claim
15 words
A resistor according to claim 1 in which the auxiliary resistor comprises a copper wire.
Claim 4
Dependent Claim
22 words
A resistor according to claim 1, further including a common bobbin on which the main resistor and the auxiliary resistor are wound.
Claim 5
Dependent Claim
73 words
A resistor according to claim 2 in which the bobbin is formed with at least four flanges which divide the length of the bobbin into a principal part around which the main resistor is wound, an auxiliary part around which the auxiliary resistor is wound, and a connection part intermediate the principal and auxiliary parts, one end each of the main resistor and the auxiliary resistor being connected together at the connection part.
Claim 6
Dependent Claim
49 words
A resistor according to claim 1 in which the main resistor is formed of a material which exhibits a resistance-temperature characteristic in the form of a quadratic curve having a pole, and in which the auxiliary resistor is formed of a material which exhibits a substantially linear resistance-temperature characteristic.
References Cited (Backward Citations)
US381304A
Cited
US1985691A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-20 | 1980-01-19 | 1980-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-20 | 1984-01-19 | 1984-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-20 | 1988-01-19 | 1988-07-20 | $7700.00 | Window Closed / Lapsed |