US4440608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and bath for the electrodeposition of tin-lead alloys
Assignee: Mcgean Rohco Inc
•
Filing: 1982-08-16
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Granted: 1984-04-03
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Expires: 2002-08-16
Abstract
Abstract A process is provided for the electrodeposition of alloys of tin and lead by passing electrical current through an anode, an aqueous acidic plating solution and a cathode, wherein the aqueous acidic plating bath includes at least one organic compound having a formula ##STR1## wherein X=O, S, or NH and R 2 and R 3 are H, or lower alkyl and R 1 is ##STR2## .
Inventors
- 👤 Vincent C. Opaskar
- 👤 Sidney C. Beach
- 👤 Robert J. Zellner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:17
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/56; C25D3/60
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
81 words
In the process of electrodepositing alloys of tin and lead on a substrate by passing electrical current through an anode, an aqueous acidic fluoride containing plating solution and a cathode, the improvement which comprises including in the aqueous acidic plating bath from about 0.025 to about 5.0 g/l of at least one organic compound having the formula ##STR18## wherein X is O, S, or NH and R 2 and R 3 are H, or lower alkyl and R 1 is ##STR19##
Claim 2
Dependent Claim
81 words
In the process of electrodepositing alloys of tin and lead on a substrate by passing electrical current through an anode, an aqueous acidic fluoride containing plating solution and a cathode, the improvement which comprises including in the aqueous acidic plating bath from about 0.025 to about 5.0 g/l of at least one organic compound having the formula ##STR18## wherein X is O, S, or NH and R 2 and R 3 are H, or lower alkyl and R 1 is ##STR19##
Claim 3
Dependent Claim
19 words
The process of claim 1 in which R 2 and R 3 are individually either ethyl, methyl or hydrogen.
Claim 4
Dependent Claim
15 words
The process of claim 2 wherein said bath also includes an ethoxylated alkyl substituted phenol.
Claim 5
Dependent Claim
23 words
The process of claim 2 in which the ethoxylated alkyl substituted phenol is present in an amount from about 0.005 to 10 g/l.
Claim 6
Dependent Claim
12 words
The process of claim 1 in which the organic compound is thiourea.
Claim 7
Dependent Claim
76 words
The process of claim 1 in which the acidic aqueous plating solution contains from about 10 to about 80 g/l of tin as fluoborate, from about 5 to about 25 g/l of lead as fluoborate, from about 100 to about 600 g/l of fluoboric acid, an ethoxylated alkyl substituted phenol in an amount ranging from about 0.1 to about 6 g/l and a urea compound in an amount ranging from about 0.025 to about 5 g/l.
Claim 8
Dependent Claim
62 words
A bath for the electrodeposition of alloys of tin and lead comprising an aqueous acidic fluoride containing lead-tin plating solution having dissolved therein from about 0.025 to about 5.0 g/l of at least one compound having the formula ##STR20## wherein X is O, S, or NH and R 2 and R 3 are H, or lower alkyl and R 1 is ##STR21##
Claim 9
Dependent Claim
62 words
A bath for the electrodeposition of alloys of tin and lead comprising an aqueous acidic fluoride containing lead-tin plating solution having dissolved therein from about 0.025 to about 5.0 g/l of at least one compound having the formula ##STR20## wherein X is O, S, or NH and R 2 and R 3 are H, or lower alkyl and R 1 is ##STR21##
Claim 10
Dependent Claim
19 words
The bath of claim 7 in which R 2 and R 3 are individually either ethyl, methyl or hydrogen.
Claim 11
Dependent Claim
13 words
The bath of claim 7 which also contains an ethoxylated alkyl substituted phenol.
Claim 12
Dependent Claim
25 words
The bath of claim 9 in which the ethoxylated aliphatic substituted phenol is present in an amount ranging from about 0.005 to about 10 g/l.
Claim 13
Dependent Claim
12 words
The bath of claim 7 in which the organic compound is thiourea.
Claim 14
Dependent Claim
77 words
The bath of claim 7 in which the acidic aqueous plating solution contains from about 10 to about 80 g/l of tin as fluoborate, from about 5 to about 25 g/l of lead as fluoborate and from about 100 to about 600 g/l of fluoboric acid, an ethoxylated alkyl substituted phenol in an amount ranging from about 0.1 to about 6 g/l, and a urea compound in an amount ranging from about 0.025 to about 5 g/l.
References Cited (Backward Citations)
US4194913A
Cited
US4053372A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-04-03 | 1987-10-03 | 1988-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-03 | 1991-10-03 | 1992-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-03 | 1995-10-03 | 1996-04-03 | $7700.00 | Window Closed / Lapsed |