US3917486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Immersion tin bath composition and process for using same
Assignee: Kollmorgen Corp
•
Filing: 1973-07-24
•
Granted: 1975-11-04
•
Expires: 1993-07-24
Abstract
Abstract The present invention relates to a novel immersion tin bath composition and a novel and improved method of depositing a smooth, even, metallic tin coating over metallic surfaces, providing improved solderability.
Inventors
- 👤 Jr Frederick W Schneble
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:18
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/1803; C23C18/1824; C23C18/1837; C23C18/1844; C23C18/52; C23C18/54
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
28 words
A IMMERSION TIN PLATING BATH COMPOSITION FOR DEPOSITING A SMOOTH, EVEEN TIN COATING ON METALLIZED SURFACE CAPABLE OF CHEMICALLY DISPLACING TIN FROM A TIN PLATING, SAID COMPOSITION COMPRISING
Claim 2
Dependent Claim
28 words
A IMMERSION TIN PLATING BATH COMPOSITION FOR DEPOSITING A SMOOTH, EVEEN TIN COATING ON METALLIZED SURFACE CAPABLE OF CHEMICALLY DISPLACING TIN FROM A TIN PLATING, SAID COMPOSITION COMPRISING
Claim 3
Dependent Claim
85 words
The immersion tin plating bath composition as defined in claim 1 wherein said soluble stannous salt is selected from the group consisting of stannous salts of halides, sulfate, fluoborate, nitrate, and acetate; the sulfur component comprises a mixture of alkali metal polysulfides and at least one other sulfur-containing compound; the wetting agent is selected from the group consisting of organic anionic, non-ionic and cationic surfactants; and said mineral acid is selected from the group consisting of hydrochloric acid, sulfuric acid, nitric acid and phosphoric acid.
Claim 4
Dependent Claim
20 words
The immersion tin plating bath as defined in claim 2 wherein said ingredients are present in the following concentration ranges:
Claim 5
Dependent Claim
18 words
The tin plating bath composition of claim 2 wherein the sulfur component contains alkali metal polysulfides and thiourea.
Claim 6
Dependent Claim
42 words
The tin plating bath composition as defined in claim 2 wherein said stannous salt is stannous chloride, said sulfur component contains thiourea and alkali metal polysulfides, and said mineral acid is hydrochloric acid and said wetting agent is a fluorinated carboxylic acid.
Claim 7
Dependent Claim
26 words
The tin plating bath composition of claim 5 wherein said fluorinated carboxylic acid is present at a concentration of from about 0.1 to about 5 g/l.
Claim 8
Dependent Claim
38 words
The immersion tin plating bath composition of claim 3 wherein said sulfur component contains thiourea and alkali metal polysulfides wherein said alkali metal polysulfides are present in the range of 0.005 to 0.2 g/l of the bath composition.
Claim 9
Dependent Claim
17 words
The tin plating bath composition of claim 7 wherein said ingredients are present in the following concentrations:
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) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |