US4452650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copper and copper alloy coating
Assignee: Olin Corp
•
Filing: 1982-02-25
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Granted: 1984-06-05
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Expires: 2002-02-25
Abstract
Abstract Copper or copper alloy sheet or foil displaying excellent solderability and high resistance to tarnish is prepared by the provision over its surface of a coating containing a copper salt of an organophosphonic acid. To form the coating, the sheet or foil is immersed for a short time in an aqueous solution containing a phosphonic acid, rinsed and dried, the treatment being combined with or preceded by oxidation of the sheet surface.
Inventors
- 👤 Elmer J. Caule
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:41
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/22; H05K3/28; H05K3/282; C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/48; C23C22/52
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
53 words
A readily solderable material resistant to tarnishing in a sulfide vapor, said material being selected from the group consisting of copper and copper alloys, said material having a surface coating of a chromate-free compound of an organophosphonic acid having the structure ##STR8## said surface coating comprising a thin, invisible and substantially pore-free layer.
Claim 2
Dependent Claim
53 words
A readily solderable material resistant to tarnishing in a sulfide vapor, said material being selected from the group consisting of copper and copper alloys, said material having a surface coating of a chromate-free compound of an organophosphonic acid having the structure ##STR8## said surface coating comprising a thin, invisible and substantially pore-free layer.
Claim 3
Dependent Claim
13 words
A material as in claim 1 wherein said compound comprises a copper salt.
Claim 4
Dependent Claim
53 words
A readily solderable material resistant to tarnishing in a sulfide vapor, said material being selected from the group consisting of copper and copper alloys, said material having a surface coating of a chromate-free compound of an organophosphonic acid having the structure ##STR9## said surface coating comprising a thin, invisible and substantially pore-free layer.
Claim 5
Dependent Claim
53 words
A readily solderable material resistant to tarnishing in a sulfide vapor, said material being selected from the group consisting of copper and copper alloys, said material having a surface coating of a chromate-free compound of an organophosphonic acid having the structure ##STR9## said surface coating comprising a thin, invisible and substantially pore-free layer.
Claim 6
Dependent Claim
13 words
A material as in claim 3 wherein said compound comprises a copper salt.
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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) | 1987-06-05 | 1987-12-05 | 1988-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-05 | 1991-12-05 | 1992-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-05 | 1995-12-05 | 1996-06-05 | $7700.00 | Window Closed / Lapsed |