USRE28597E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resistor
Assignee: —
•
Filing: 1975-02-20
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Granted: 1975-10-28
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Expires: 1995-02-20
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 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
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:36
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/06; H01C7/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
81 words
A resistor comprising an insulating base, a metal foil bonded onto said insulating base with an adhesive, the difference between the linear expansion coefficient of said metal foil and that of said insulating base being 26 to 66 X 10 7/*C, said metal foil being formed in a resistance pattern of a desired length by etching, lead wires connected to the respective ends of said metal foil and a mold covering an assembly of said base, metal foil and lead wires.
Claim 2
Dependent Claim
81 words
A resistor comprising an insulating base, a metal foil bonded onto said insulating base with an adhesive, the difference between the linear expansion coefficient of said metal foil and that of said insulating base being 26 to 66 X 10 7/*C, said metal foil being formed in a resistance pattern of a desired length by etching, lead wires connected to the respective ends of said metal foil and a mold covering an assembly of said base, metal foil and lead wires.
Claim 3
Dependent Claim
27 words
A resistor according to 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 4
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 5
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 6
Dependent Claim
34 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 7
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) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |