Patent US4744622A successfully refreshed from Google Patents.
Patent US4184928A successfully refreshed from Google Patents.
US4184928A
Expired / Lapsed
US
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Method of preparing a steel surface for painting or enamelling
Assignee: Hh-Produkter Magnusson and Co
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Filing: 1978-08-30
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Granted: 1980-01-22
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Expires: 1998-08-30
Abstract
Abstract A method of preparing a steel surface for painting or enamelling in which the surface is coated with a tin-zinc alloy by electrodeposition from an aqueous electrolyte containing zinc sulphamate, tin sulphate and sulphamic acid.
Inventors
- 👤 Hugo Hoije
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:14
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/56; C25D3/565; C25D3/60; C25D5/00; C25D5/04; C25D5/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
73 words
A method of preparing a steel surface for painting or enamelling which comprises the step of coating the surface with a tin-zinc alloy by electrodeposition from an aqueous electrolyte containing zinc sulphamate, tin sulphate and sulphamic acid, the proportion of tin sulphate to zinc sulphate being such as to provide a weight ratio of not less than 20:80 and not more than 60:40 between the tin and the zinc present in the solution.
Claim 2
Independent Claim
73 words
A method of preparing a steel surface for painting or enamelling which comprises the step of coating the surface with a tin-zinc alloy by electrodeposition from an aqueous electrolyte containing zinc sulphamate, tin sulphate and sulphamic acid, the proportion of tin sulphate to zinc sulphate being such as to provide a weight ratio of not less than 20:80 and not more than 60:40 between the tin and the zinc present in the solution.
Claim 3
Dependent Claim
55 words
An electrolyte for electrodepositing a metallic coating on a steel surface preparatory to painting or enamelling said surface, comprising of an aqueous solution containing zinc sulphamate, tin sulphate and sulphamic acid, the weight ratio of the contents of tin and zinc of the solution amounting to not less than 20:80 and not more than 60:40.
Claim 4
Dependent Claim
55 words
An electrolyte for electrodepositing a metallic coating on a steel surface preparatory to painting or enamelling said surface, comprising of an aqueous solution containing zinc sulphamate, tin sulphate and sulphamic acid, the weight ratio of the contents of tin and zinc of the solution amounting to not less than 20:80 and not more than 60:40.
Claim 5
Dependent Claim
12 words
An electrolyte as claimed in claim 2 which additionally contains malic 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) | 1983-01-21 | 1983-07-23 | 1984-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-21 | 1987-07-23 | 1988-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-21 | 1991-07-23 | 1992-01-22 | $7700.00 | Window Closed / Lapsed |