US4565610A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bath and process for plating lead and lead/tin alloys
Assignee: Shipley Co Inc
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Filing: 1985-04-15
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Granted: 1986-01-21
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Expires: 2005-04-15
Abstract
Abstract This invention relates to the electrodeposition of tin, lead and particularly tin-lead alloys from an electroplating bath comprising a lead and/or tin alkylsulfonate, an alkylsulfonic acid in a sufficient amount to impart a pH below about 3 to the bath, and various additives to improve the brightness of the deposits, the useful current density ranges, and/or the solderability of tin-lead alloy deposits including quaternary nitrogen wetting agents containing a fatty acid radical, alkylene oxides, pyridine compounds, aromatic aldehydes, acetaldehyde and/or a bismuth compound.
Inventors
- 👤 Fred I. Nobel
- 👤 Barnet Ostrow
- 👤 David N. Schram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:51
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/30; C25D3/32; C25D3/34; C25D3/36; C25D3/56; C25D3/60; H; H05; H05K; H05K3/00; H05K3/30; H05K3/32; H05K3/34; H05K3/3465; H05K3/3473
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
64 words
An electroplating bath for the electrodeposition of lead and lead-tin alloys comprising an aqueous solution containing the metal or metals as a lower alkylsulfonate salt, a soluble alkylsulfonic acid in a sufficient amount to give a pH below about 3 to the bath, an aromatic aldehyde and a soluble bismuth compound in a sufficient amount to extend current density range for producing bright deposits.
Claim 2
Dependent Claim
64 words
An electroplating bath for the electrodeposition of lead and lead-tin alloys comprising an aqueous solution containing the metal or metals as a lower alkylsulfonate salt, a soluble alkylsulfonic acid in a sufficient amount to give a pH below about 3 to the bath, an aromatic aldehyde and a soluble bismuth compound in a sufficient amount to extend current density range for producing bright deposits.
Claim 3
Dependent Claim
18 words
The bath of claim 1 containing acetaldehyde in a sufficient amount to extend the useful current density range.
Claim 4
Dependent Claim
62 words
An electroplating bath for the electrodeposition of lead-tin alloys comprising an aqueous solution containing lead and tin as soluble alkyl-sulfonates, a sufficient amount of a soluble alkylsulfonic acid salt to impart a pH value below about 3 to said bath, and an aromatic aldehyde and a soluble bismuth compound in a sufficient amount to extend current density range for producing bright deposits.
Claim 5
Dependent Claim
62 words
An electroplating bath for the electrodeposition of lead-tin alloys comprising an aqueous solution containing lead and tin as soluble alkyl-sulfonates, a sufficient amount of a soluble alkylsulfonic acid salt to impart a pH value below about 3 to said bath, and an aromatic aldehyde and a soluble bismuth compound in a sufficient amount to extend current density range for producing bright deposits.
Claim 6
Dependent Claim
18 words
The bath of claim 3 containing acetaldehyde in a sufficient amount to extend the useful current density range.
Claim 7
Dependent Claim
21 words
A method for electroplating lead-tin alloys wnhich comprises immersing a substrate to be plated into the electroplating bath of claim 4.
Claim 8
Dependent Claim
21 words
A method for electroplating lead-tin alloys which comprises immersing a substrate to be plated into the electroplating bath of claim 3.
Claim 9
Independent Claim
73 words
A method for electroplating lead and lead-tin alloys which comprises immersing a substrate to be plated into an electroplating bath comprising an aqueous solution containing lead and tin as soluble alkyl-sulfonates, a sufficient amount of a soluble alkylsulfonic acid salt to impart a pH value below about 3 to said bath, and an aromatic aldehyde and a soluble bismuth compound in a sufficient amount to extend current density range for producing bright deposits.
Claim 10
Independent Claim
73 words
A method for electroplating lead and lead-tin alloys which comprises immersing a substrate to be plated into an electroplating bath comprising an aqueous solution containing lead and tin as soluble alkyl-sulfonates, a sufficient amount of a soluble alkylsulfonic acid salt to impart a pH value below about 3 to said bath, and an aromatic aldehyde and a soluble bismuth compound in a sufficient amount to extend current density range for producing bright deposits.
Claim 11
Dependent Claim
23 words
The method of claim 7 wherein the electroplating bath further comprises acetaldehyde in a sufficient amount to extend the useful current density range.
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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) | 1989-01-20 | 1989-07-22 | 1990-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-20 | 1993-07-22 | 1994-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-20 | 1997-07-22 | 1998-01-21 | $7700.00 | Window Closed / Lapsed |