Patent US5332486A successfully refreshed from Google Patents.
US5332486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-oxidant coatings for copper foils
Assignee: Gould Electronics Inc
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Filing: 1993-01-29
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Granted: 1994-07-26
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Expires: 2013-01-29
Abstract
Abstract This invention relates to a method for increasing oxidation protection and decreasing the nonuniformities in an electrodeposited layer of a treated copper foil or treated copper-based alloy foil, comprising depositing a protective anti-oxidation coating onto at least one surface of said foil from a solution comprising arsenic. The invention also encompasses the copper foil or copper-based alloy foil coated to improve appearance and oxidation resistance of the foil.
Inventors
- 👤 Dino F. DiFranco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:41
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/38; H05K3/382; H05K3/384; C; C25; C25D; C25D1/00; C25D1/04; C25D5/00; C25D5/48; H05K3/22; H05K3/28; H05K3/282; H05K2201/00; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0355; H05K2203/00; H05K2203/07; H05K2203/0703; H05K2203/0723; H05K3/24; H05K3/244; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12431; Y10T428/12438; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12903
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
47 words
A method for increasing oxidation protection and decreasing the nonuniformities in an electrodeposited layer of a treated copper foil or treated copper-based alloy foil, comprising electrodepositing a protective anti-oxidation coating onto at least one surface of said foil from a solution comprising ions of chromium and arsenic.
Claim 2
Independent Claim
47 words
A method for increasing oxidation protection and decreasing the nonuniformities in an electrodeposited layer of a treated copper foil or treated copper-based alloy foil, comprising electrodepositing a protective anti-oxidation coating onto at least one surface of said foil from a solution comprising ions of chromium and arsenic.
Claim 3
Dependent Claim
31 words
The method according to claim 1 wherein said arsenic is present in solution in the pentavalent oxidation state and in a concentration range of about 5 ppm to about 400 ppm.
Claim 4
Dependent Claim
21 words
The method according to claim 2 wherein arsenic is added to said bath as arsenic acid, ortho-arsenic acid or pyro-arsenic acid.
Claim 5
Dependent Claim
23 words
The method according to claim 2 wherein said arsenic is present in the concentration range of about 100 ppm to about 200 ppm.
Claim 6
Dependent Claim
15 words
The method according to claim 4 wherein said concentration of arsenic is about 150 ppm.
Claim 7
Dependent Claim
20 words
The method according to claim 1 wherein said anti-oxidation coating is deposited on wrought copper foil or copper-based alloy foil.
Claim 8
Dependent Claim
20 words
The method according to claim 1 wherein said anti-oxidation coating is deposited on electroformed copper foil or copper-based alloy foil.
Claim 9
Dependent Claim
13 words
The method according to claim 1 wherein said anti-oxidation coating further contains zinc.
Claim 10
Dependent Claim
28 words
The method according to claim 1 wherein said coating is applied to said surface of said foil by electroplating at current density of no greater than 25 ASF.
Claim 11
Dependent Claim
22 words
The method according to claim 9 wherein said anti-oxidation coating comprises about 0.1 μg/dm 2 to about 20 μg/dm 2 of arsenic.
Claim 12
Dependent Claim
100 words
A treated copper foil or copper-based alloy foil having on at least one surface thereof an electrodeposited anti-tarnish layer comprising chromium and a minor effective amount of arsenic said minor effective amount of arsenic being effective to provide said foil improved appearance and resistance to oxidation wherein said foil exhibits increased oxidation resistance as indicated by an HTO rating of about 1.0 to about 2.0 measured at 250° C. for 15 minutes and improved appearance as indicated by a uniformity rating of about 95 percent to about 100 percent wherein said foil is produced by the method of claim 1.
Claim 13
Dependent Claim
84 words
A copper foil having on at least one surface thereof an electrodeposited anti-tarnish layer comprising chromium and a minor effective amount of arsenic said minor effective amount of arsenic being effective to provide said foil improved appearance and resistance to oxidation wherein said foil exhibits increased oxidation resistance as indicated by an HTO rating of about 1.0 to about 2.0 measured at 250° C. for 15 minutes and improved appearance as indicated by a uniformity rating of about 95 percent to about 100 percent.
Claim 14
Dependent Claim
84 words
A copper foil having on at least one surface thereof an electrodeposited anti-tarnish layer comprising chromium and a minor effective amount of arsenic said minor effective amount of arsenic being effective to provide said foil improved appearance and resistance to oxidation wherein said foil exhibits increased oxidation resistance as indicated by an HTO rating of about 1.0 to about 2.0 measured at 250° C. for 15 minutes and improved appearance as indicated by a uniformity rating of about 95 percent to about 100 percent.
Claim 15
Dependent Claim
30 words
A foil according to claim 22 wherein said anti-tarnish layer further comprises a major amount of zinc and said layer is adjacent to a shiny side of said copper foil.
Claim 16
Dependent Claim
27 words
The foil according to claim 11 wherein said HTO rating is in the range of about 1.0 to about 1.5 and said uniformity rating is about 100%.
Claim 17
Dependent Claim
23 words
The foil according to claim 11 wherein said coated foil comprises from about 5 μg/dm 2 to about 10 μg/dm 2 of arsenic.
References Cited (Backward Citations)
US3625844A
Cited
USRE30180E
Cited
US3853716A
Cited
US4131517A
Cited
GB2030176A
Cited
GB2073779A
Cited
US4456508A
Cited
US4387006A
Cited
US4469567A
Cited
US5057193A
Cited
US4952285A
Cited
US5098796A
Cited
US5022968A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-07-25 | 1998-01-24 | 1998-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-25 | 2002-01-24 | 2002-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-25 | 2006-01-24 | 2006-07-26 | $7700.00 | Window Closed / Lapsed |