US4264379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for coating copper and copper alloy
Assignee: Olin Corp
•
Filing: 1980-01-11
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Granted: 1981-04-28
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Expires: 2000-01-11
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
2026-10-28 11:35
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: 16
Claim 1
Independent Claim
92 words
A method for producing a thin substantially invisible and pore-free film over a copper and copper alloy surface, said film providing increased resistance to tarnish and improved solderability to said surface, comprising: (a) providing a material selected from the group consisting of copper and copper alloys; (b) applying to said material a solution containing an organophosphonic acid and a chromate free oxidizing agent for at least 4 seconds to form said film as a surface coating of a compound of said organophosphonic acid; (c) rinsing said material; and (d) drying said material.
Claim 2
Independent Claim
92 words
A method for producing a thin substantially invisible and pore-free film over a copper and copper alloy surface, said film providing increased resistance to tarnish and improved solderability to said surface, comprising: (a) providing a material selected from the group consisting of copper and copper alloys; (b) applying to said material a solution containing an organophosphonic acid and a chromate free oxidizing agent for at least 4 seconds to form said film as a surface coating of a compound of said organophosphonic acid; (c) rinsing said material; and (d) drying said material.
Claim 3
Dependent Claim
45 words
A method according to claim 1, wherein the said acid is a phosphonic acid having a structure derived by the replacement of one of the three hydroxyl groups of phosphoric acid by a hydrocarbon radical having a C atom linked directly to a P atom.
Claim 4
Dependent Claim
15 words
A method according to claim 1, wherein the said acid contains a monovalent hydrocarbon radical.
Claim 5
Dependent Claim
14 words
A method according to claim 1, wherein the said acid contains an alkyl group.
Claim 6
Dependent Claim
14 words
A method according to claim 1, wherein the said acid contains an acyl group.
Claim 7
Dependent Claim
14 words
A method according to claim 1, wherein the said acid contains a hydroxylalkyl group.
Claim 8
Dependent Claim
24 words
A method according to claim 1, wherein the organophosphonic acid solution is maintained at a temperature of about 20° C. to about 100° C.
Claim 9
Dependent Claim
21 words
A method according to claim 1, wherein the said solution is applied to said material for 4 to about 20 seconds.
Claim 10
Dependent Claim
25 words
A method according to claim 1, wherein the said acid is applied in aqueous solution at a concentration of about 0.1% to 40% by weight.
Claim 11
Dependent Claim
26 words
A method according to claim 1, wherein the said oxidizing agent is applied in aqueous solution at a concentration of about 0.1% to 15% by weight.
Claim 12
Dependent Claim
14 words
A method according to claim 1, wherein the said oxidizing agent is nitric acid.
Claim 13
Dependent Claim
22 words
A method according to claim 1, wherein the said oxidizing agent is applied to said material prior to applying said organophosphonic acid.
Claim 14
Dependent Claim
14 words
A method according to claim 1, wherein the said acid has the structure ##STR8##
Claim 15
Dependent Claim
14 words
A method according to claim 1, wherein the said acid has the structure ##STR9##
Claim 16
Dependent Claim
14 words
A method according to claim 1, wherein the said acid has the structure ##STR10##
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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) | 1984-04-27 | 1984-10-27 | 1985-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-27 | 1988-10-27 | 1989-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-27 | 1992-10-27 | 1993-04-28 | $7700.00 | Window Closed / Lapsed |