Patent US3824521A successfully refreshed from Google Patents.
US3824521A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resistor
Assignee: TDK Corp
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Filing: 1973-09-24
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Granted: 1974-07-16
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Expires: 1993-09-24
Abstract
Abstract An improved thin-film resistor low in the resistance temperature coefficient is provided. A metal film or foil is bonded with a thermosetting resin onto an insulating base plate having a lower linear expansion coefficient than the metal and is etchingprocessed so as to be of a desired resistance pattern. The difference in the linear expansion coefficient between the metal and the insulating base is selected to be 26 to 66 X 10 7/*C. The metal and base are covered with a resin so as to be a molded assembly, together with lead wires connected to both ends of the metal.
Inventors
- 👤 M Zama
- 👤 H Takashina
- 👤 K Horii
- 👤 K Ohya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:57
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/22; H01C7/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
26 words
A resistor according claim 1 wherein said metal foil is of an Ni - Cr alloy of a weight ratio of Ni/Cr of 90/10 to 70/30.
Claim 2
Dependent Claim
22 words
A resistor according to claim 2 wherein Cu, Al, Si and Mn are added as additives to said Ni - Cr alloy.
Claim 3
Dependent Claim
29 words
A resistor according to claim 1 wherein the ratio of the thickness of the insulating base to the thickness of the metal foil is 100 to 1,000 : 1.
Claim 4
Dependent Claim
36 words
A resistor according to claim 1 wherein the linear expansion coefficient of said metal foil is substantially 136 X 10 7 /*C and the linear expansion coefficient of said base is 70 X 10 7 /*C.
Claim 5
Dependent Claim
40 words
A resistor according to claim 1 wherein said metal foil is of an alloy of Ni/Cr of 85/15 containing 4 percent by weight Cu, 2 percent by weight Al, 1 percent by weight Si and 1 percent by weight Mn.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |