US5262247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thin copper foil for printed wiring board
Assignee: Fukuda Kinoku Hakafun Kogyo KK
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Filing: 1992-11-30
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Granted: 1993-11-16
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Expires: 2012-11-30
Abstract
Abstract A thin copper foil for a printed wiring board comprising a copper foil supporter having a surface with a roughness; a parting payer consisting of chrome compound; a thin copper foil layer formed on the parting layer which will be attached to a board as printed wiring. A copper-nickel compound metal layer is interposed between the parting layer and the thin copper foil layer, wherein said copper-nickel compound metal layer is formed to be integral with the thin copper foil layer with a peel strength therebetween such that said copper-nickel compound metal layer will be left on the thin copper layer when the parting layer with the copper foil supporter is peeled off.
Inventors
- 👤 Toshiyuki Kajiwara
- 👤 Yoshinori Tanii
- 👤 Kazuhiko Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:24
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/02; H05K3/022; H05K3/025; H05K2201/00; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0338; H05K2203/00; H05K2203/01; H05K2203/0147; H05K2203/0152; H05K2203/03; H05K2203/0307; H05K2203/0315; H05K2203/0361; H05K2203/07; H05K2203/0703; H05K2203/0723; H05K2203/0726; H05K3/38; H05K3/382; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12431; Y10T428/12438; Y10T428/12472; Y10T428/12493; Y10T428/12535; Y10T428/12611; Y10T428/12771; Y10T428/12861; Y10T428/12903; Y10T428/1291; Y10T428/12993
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
135 words
A thin copper foil for a printed wiring board comprising: a copper foil supporter having a surface with a roughness of at least 1 μm; a parting layer consisting of chrome compound formed by a chromate treatment of first surface; a thin copper foil layer formed on the parting layer which will be attached to a board as printed wiring to thereby form the printed wiring board; and a copper-nickel compound metal layer interposed between the parting layer and the thin copper foil layer, wherein said copper-nickel compound metal layer is formed to be integral with the thin copper foil layer with a peel strength there between such that said copper-nickel compound metal layer will be left on the thin copper foil layer when the parting layer with the copper foil supporter is peeled off.
Claim 2
Dependent Claim
135 words
A thin copper foil for a printed wiring board comprising: a copper foil supporter having a surface with a roughness of at least 1 μm; a parting layer consisting of chrome compound formed by a chromate treatment of first surface; a thin copper foil layer formed on the parting layer which will be attached to a board as printed wiring to thereby form the printed wiring board; and a copper-nickel compound metal layer interposed between the parting layer and the thin copper foil layer, wherein said copper-nickel compound metal layer is formed to be integral with the thin copper foil layer with a peel strength there between such that said copper-nickel compound metal layer will be left on the thin copper foil layer when the parting layer with the copper foil supporter is peeled off.
Claim 3
Dependent Claim
69 words
A thin copper foil for a printed wiring board as claimed in claim 1 wherein: the surface of the copper foil supporter has a roughness within a range of 1-10 μm; the composition of the copper-nickel compound metal layer includes copper of 1-90 weight % and nickel the remaining percentage and has a thickness of 0.01-6 μm; and the thin copper foil layer has a thickness of 1-10 μm.
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) | 1996-11-15 | 1997-05-17 | 1997-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-15 | 2001-05-17 | 2001-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-15 | 2005-05-17 | 2005-11-16 | $7700.00 | Window Closed / Lapsed |