Patent US3606784A successfully refreshed from Google Patents.
US4038457A
Expired / Lapsed
US
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Fusible metal film resistor
Assignee: Panasonic Holdings Corp
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Filing: 1976-02-12
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Granted: 1977-07-26
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Expires: 1996-02-12
Abstract
Abstract A fusible metal film resistor comprising a substrate of an electrically insulating material and a resistive film formed on the substrate, which consists of nickel, 4 to 12 weight % of phosphorus and 0.05 to 10 weight % of at least one additive metal of iron, tin, manganese and bismuth, has a stable and small temperature coefficient of resistance suitable as a precision resistor at a normal load and disconnects easily and rapidly at abnormal overload due to a rapid decrease of resistance at a high temperature which leads to fusion of the film as a result of heat generated by increased current.
Inventors
- 👤 Terukazu Kinugasa
- 👤 Hyogo Hirohata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:25
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/22; H01H; H01H85/00; H01H85/02; H01H85/04; H01H85/041; H01H85/046; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
57 words
A fusible metal film resistor comprising a substrate of an electrically insulating material and a resistive film formed on said substrate, said resistive film consisting essentially of nickel, 4 to 12 weight % of phosphorus, and 0.05 to 10 weight % of at least one member selected from the group consisting of iron, tin, manganese and bismuth.
Claim 2
Dependent Claim
57 words
A fusible metal film resistor comprising a substrate of an electrically insulating material and a resistive film formed on said substrate, said resistive film consisting essentially of nickel, 4 to 12 weight % of phosphorus, and 0.05 to 10 weight % of at least one member selected from the group consisting of iron, tin, manganese and bismuth.
Claim 3
Dependent Claim
15 words
A fusible metal film resistor according to claim 1, wherein said one member is iron.
Claim 4
Dependent Claim
15 words
A fusible metal film resistor according to claim 1, wherein said one member is tin.
Claim 5
Dependent Claim
15 words
A fusible metal film resistor according to claim 1, wherein said one member is manganese.
Claim 6
Dependent Claim
15 words
A fusible metal film resistor according to claim 1, wherein said one member is bismuth.
Claim 7
Dependent Claim
23 words
A fusible metal film resistor according to claim 1, wherein said resistive film is heated at a temperature of 100° to 300° C.
Claim 8
Dependent Claim
31 words
A fusible metal film resistor according to claim 2, wherein said resistive film consists of 5.0 to 10 weight % of phosphorus, 0.05 to 6.0 weight % of iron and nickel.
Claim 9
Dependent Claim
16 words
A fusible metal film resistor according to claim 1 wherein said substrate is ceramic or glass.
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) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |