US3850765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bright solder plating
Assignee: Oxy Metal Finishing Corp
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Filing: 1973-05-21
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Granted: 1974-11-26
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Expires: 1993-05-21
Abstract
Abstract Disclosed is a method and composition for electroplating a layer of bright solder on a base metal. In addition to soluble divalent tin and lead salts, the bath contains formaldehyde, an aryl primary amine, a condensation product of an aromatic aldehyde and an aromatic amine and a polynuclear aromatic disulfonic acid. Deposits obtained by this bath are not only mirror bright, but exhibit no haze. An important advantage is that the solderability of the deposit may be correlated to its physical appearance.
Inventors
- 👤 G Karustis
- 👤 E Leahy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:59
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/56; C25D3/60; H; H05; H05K; H05K3/00; H05K3/30; H05K3/32; H05K3/34; H05K3/3465; H05K3/3473
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
74 words
AN AQUEOUS ACIDIC COMPOSITION SUITABLE FOR ELECTROPLATING A BRIGHT TIN-LEAD ALLOY OF HIGH SOLDERABILITY, COMPRISING: A. 3.5-60 G/L DIVALENT TIN; B. 30-45 WT. PERCENT DIVALENT LEAD, BASED ON THE TOTAL OF LEAD AND TIN IN THE BATH; C. 6-12 G/L FORMALDEHYDE; D. AT LEAST 0.1 G/L OF AN ARYL PRIMARY AMINE; E. AT LEAST 0.001 G/L OF A CONDENSATION PRODUCT OF AN AROMATIC ALDLEHYDE AND AN AROMATIC AMINE; AND F. A SURFACTANT COMBINATION COMPRISING:
Claim 2
Dependent Claim
74 words
AN AQUEOUS ACIDIC COMPOSITION SUITABLE FOR ELECTROPLATING A BRIGHT TIN-LEAD ALLOY OF HIGH SOLDERABILITY, COMPRISING: A. 3.5-60 G/L DIVALENT TIN; B. 30-45 WT. PERCENT DIVALENT LEAD, BASED ON THE TOTAL OF LEAD AND TIN IN THE BATH; C. 6-12 G/L FORMALDEHYDE; D. AT LEAST 0.1 G/L OF AN ARYL PRIMARY AMINE; E. AT LEAST 0.001 G/L OF A CONDENSATION PRODUCT OF AN AROMATIC ALDLEHYDE AND AN AROMATIC AMINE; AND F. A SURFACTANT COMBINATION COMPRISING:
Claim 3
Dependent Claim
3 words
AN ANIONIC SURFACTANT;
Claim 4
Dependent Claim
3 words
AN ANIONIC SURFACTANT;
Claim 5
Dependent Claim
4 words
A AMPHOTERIC SURFACTANT; AND
Claim 6
Dependent Claim
4 words
A AMPHOTERIC SURFACTANT; AND
Claim 7
Dependent Claim
20 words
The composition of claim 1 additionally comprising at least 0.001 g/l of a polynuclear aromatic disulfonic acid or salt thereof.
Claim 8
Dependent Claim
4 words
an amphoteric surfactant; and
Claim 9
Dependent Claim
4 words
an amphoteric surfactant; and
Claim 10
Dependent Claim
3 words
a non-ionic surfactant.
Claim 11
Dependent Claim
3 words
a non-ionic surfactant.
Claim 12
Dependent Claim
40 words
The composition of claim 2 wherein said sulfonic acid comprises at least two fused aromatic rings and two sulfonic acid substituents, said rings substituted or not with alkyl or alkoxy groups of up to four carbon atoms or a halide.
Claim 13
Dependent Claim
3 words
A NON-IONIC SURFACTANT.
Claim 14
Dependent Claim
3 words
A NON-IONIC SURFACTANT.
Claim 15
Dependent Claim
13 words
The composition of claim 1 wherein said aryl primary amine has the formula:
Claim 16
Dependent Claim
14 words
The composition of claim 4 wherein said condensation product is represented by the formula:
Claim 17
Dependent Claim
23 words
A method of electroplating solder on a base metal surface comprising electrolyzing the composition of claim 1 with said base metal as cathode.
Claim 18
Dependent Claim
20 words
The method of claim 6 wherein said composition additionally comprises at least 0.001 g/l of a polynuclear aromatic disulfonic acid.
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) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |