Patent US4220945A successfully refreshed from Google Patents.
US4220945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printed circuit substrate with resistance coat
Assignee: Nitto Denko Corp
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Filing: 1978-03-07
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Granted: 1980-09-02
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Expires: 1998-03-07
Abstract
Abstract A printed circuit substrate with a resistance coat comprises an insulating support having provided at least on the one side thereof a highly conductive material layer interposed with a resistance coat. The resistance coat comprises tin-nickel alloy.
Inventors
- 👤 Takeshi Kakuhashi
- 👤 Yasufumi Miyake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:59
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/16; H05K1/167; H05K3/00; H05K3/38; H05K3/382; H05K3/384; H05K2201/00; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0355; H05K2203/00; H05K2203/03; H05K2203/0361; H05K2203/07; H05K2203/0703; H05K2203/0723; H05K3/02; H05K3/022
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
55 words
A printed circuit substrate with a resistance coat, comprising an insulating support having provided at least on one side thereof a plated resistance coat of a tin-nickel alloy consisting essentially of about 50-85% by weight tin and about 15-50% by weight nickel, and further comprising a highly conductive material layer disposed over said resistance coat.
Claim 2
Dependent Claim
55 words
A printed circuit substrate with a resistance coat, comprising an insulating support having provided at least on one side thereof a plated resistance coat of a tin-nickel alloy consisting essentially of about 50-85% by weight tin and about 15-50% by weight nickel, and further comprising a highly conductive material layer disposed over said resistance coat.
Claim 3
Dependent Claim
24 words
The printed circuit substrate as recited in claim 1, wherein said resistance coat comprises a tin-nickel alloy containing 64 to 70% by weight tin.
Claim 4
Dependent Claim
20 words
The printed circuit substrate as recited in claim 1, wherein said resistance coat is applied by electroplating or chemical plating.
Claim 5
Dependent Claim
29 words
The printed circuit substrate as recited in claim 1, wherein the thickness of said resistance coat comprising tin-nickel alloy is in a range of about 70 to 2000 A.
Claim 6
Dependent Claim
32 words
The printed circuit substrate as recited in claim 1, wherein a sheet resistance of said resistance coat comprising tin-nickel alloy is in a range of about 20 to 450 ohms per square.
Claim 7
Dependent Claim
18 words
The printed circuit substrate as recited in claim 1, wherein said highly conductive material layer is copper foil.
Claim 8
Dependent Claim
33 words
The printed circuit substrate as recited in claim 1, wherein the ratio of tin content to nickel content is said resistance coat is substantially the same as the ratios of their atomic weights.
References Cited (Backward Citations)
US859608A
Cited
US2662957A
Cited
US2632831A
Cited
US2803729A
Cited
US3337426A
Cited
US3396055A
Cited
US3522085A
Cited
US3808576A
Cited
US4017712A
Cited
US4038457A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-02 | 1984-03-03 | 1984-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-02 | 1988-03-03 | 1988-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-02 | 1992-03-03 | 1992-09-02 | $7700.00 | Window Closed / Lapsed |