US5338619A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copper foil for printed circuits and method of producing same
Assignee: Fukuda Metal Foil and Powder Co Ltd
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Filing: 1992-08-04
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Granted: 1994-08-16
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Expires: 2012-08-04
Abstract
Abstract A copper foil for printed circuits having a rust-preventive and heat-discoloration resistant coat, comprising a first layer of zinc or an alloy or a compound or a composition including zinc mainly, and a second layer including a silane coupling agent and phosphorus or a phosphorus compound, said second layer being positioned on the first layer. A method of producing a copper foil for printed circuits comprising the steps of treating the shiny side of a copper foil in a manner of cathode electrolysis in an alkaline solution including zinc ions and chrome ions, or providing the shiny side of a copper foil with a thin plating layer of zinc or a zinc alloy, and thereafter applying onto the treated surface of the copper foil a solution including a silane coupling agent and phosphorus or a phosphorus compound.
Inventors
- 👤 Katsuhito Fukuda
- 👤 Masato Takami
- 👤 Hirokazu Hasegawa
- 👤 Chiaki Nakajima
- 👤 Kenji Isihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:21
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/38; H05K3/389; H05K3/382; H05K3/384; H05K2201/00; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0355; H05K2203/00; H05K2203/07; H05K2203/0703; H05K2203/0723; H05K3/02; H05K3/022; H05K3/22; H05K3/24; H05K3/244; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12542; Y10T428/12549; Y10T428/12556; Y10T428/12611; Y10T428/12771; Y10T428/12785; Y10T428/12792; Y10T428/12861; Y10T428/12903
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
73 words
A copper foil for printed circuits having a heat-discoloration and a rust-preventive resistant coat on a shiny side thereof, comprising: a first layer of a zinc composition comprising zinc and an oxide of chromium formed on the shiny side of said copper foil, and a second layer comprising a silane coupling agent containing 0.01-20 mg/m 2 of Si and a phosphorous compound with 0.01-20 mg/m 2 of phosphorous formed on the first layer.
Claim 2
Dependent Claim
73 words
A copper foil for printed circuits having a heat-discoloration and a rust-preventive resistant coat on a shiny side thereof, comprising: a first layer of a zinc composition comprising zinc and an oxide of chromium formed on the shiny side of said copper foil, and a second layer comprising a silane coupling agent containing 0.01-20 mg/m 2 of Si and a phosphorous compound with 0.01-20 mg/m 2 of phosphorous formed on the first layer.
Claim 3
Dependent Claim
16 words
The copper foil of claim 1 wherein said zinc composition includes 1-50 mg/m 2 of zinc.
Claim 4
Dependent Claim
83 words
A copper foil for printed circuits having a heat-discoloration and a rust-preventive resistant coat on a shiny side thereof, comprising: a first layer of zinc of a zinc alloy formed on the shiny side of said copper foil, a second layer of a chromium oxide formed by chromate treatment on said first layer, and a third layer comprising a silane coupling agent with 0.01-20 mg/m 2 of Si and a phosphorus compound with 0.01-20 mg/m 2 of phosphorous formed on the second layer.
Claim 5
Dependent Claim
83 words
A copper foil for printed circuits having a heat-discoloration and a rust-preventive resistant coat on a shiny side thereof, comprising: a first layer of zinc of a zinc alloy formed on the shiny side of said copper foil, a second layer of a chromium oxide formed by chromate treatment on said first layer, and a third layer comprising a silane coupling agent with 0.01-20 mg/m 2 of Si and a phosphorus compound with 0.01-20 mg/m 2 of phosphorous formed on the second layer.
Claim 6
Dependent Claim
19 words
The copper foil of claim 3 wherein said zinc or said zinc alloy includes 1-50 mg/m 2 of zinc.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-08-15 | 1998-02-14 | 1998-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-15 | 2002-02-14 | 2002-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-15 | 2006-02-14 | 2006-08-16 | $7700.00 | Window Closed / Lapsed |