US4094701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for cleaning tin surfaces
Assignee: MAN-GILL CHEMICAL COMPANY AN OH CORP
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Filing: 1976-03-18
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Granted: 1978-06-13
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Expires: 1996-03-18
Abstract
Abstract An aqueous alkaline solution containing an organic tannin is used to clean a tin surface. The composition is particularly useful for cleaning tin surfaces because the presence of the tannin inhibits etching of the tin surface which normally occurs under alkaline conditions.
Inventors
- 👤 Douglas D. Fekete
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:21
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/14; C23G1/16; C23G1/18; C23G1/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
43 words
A process for cleaning a tin surface without substantial etching thereof comprising contacting the surface with an aqueous alkaline solution having a pH value of at least 9.0 and containing an organic tannin in an amount sufficient to inhibit etching of the surface.
Claim 2
Dependent Claim
43 words
A process for cleaning a tin surface without substantial etching thereof comprising contacting the surface with an aqueous alkaline solution having a pH value of at least 9.0 and containing an organic tannin in an amount sufficient to inhibit etching of the surface.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein the tannin concentration of the solution is at least 0.01 wt.%.
Claim 4
Dependent Claim
18 words
The process of claim 1 wherein the solution is maintained at a temperature of 100° to 180° F.
Claim 5
Dependent Claim
15 words
The process of claim 1 wherein the solution pH value is between 10 and 13.
Claim 6
Dependent Claim
24 words
The process of claim 1 wherein the solution additionally contains a surfactant in an amount sufficient to improve the cleaning ability of the solution.
References Cited (Backward Citations)
GB190719292A
Cited
US1628163A
Cited
US2215814A
Cited
US2836566A
Cited
GB1293440A
Cited
US3888783A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-12 | 1981-12-12 | 1982-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-12 | 1985-12-12 | 1986-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-12 | 1989-12-12 | 1990-06-13 | $7700.00 | Window Closed / Lapsed |