US3988254A
Expired / Lapsed
US
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De-smutting agent
Assignee: Fujifilm Holdings Corp
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Filing: 1974-06-14
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Granted: 1976-10-26
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Expires: 1994-06-14
Abstract
Abstract A de-smutting agent comprising an aqueous solution containing a water-soluble hydrogen peroxymonosulfate and a water-soluble hydrogen sulfate and a method for removing smut from aluminum.
Inventors
- 👤 Teruo Mori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:00
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C23G1/12; C23G1/125
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
68 words
A method of removing smut from aluminum comprising treating the surface of said aluminum with a de-smutting agent consisting essentially of an aqueous solution containing at least 0.1% by weight of a water-soluble hydrogen peroxy-monosulfate of the formula MHSO 5 wherein M is an alkali metal ion or an ammonium group and at least 0.1 mol/liter of a water-soluble hydrogen sulfate so that the de-smutting agent is acidic.
Claim 2
Independent Claim
68 words
A method of removing smut from aluminum comprising treating the surface of said aluminum with a de-smutting agent consisting essentially of an aqueous solution containing at least 0.1% by weight of a water-soluble hydrogen peroxy-monosulfate of the formula MHSO 5 wherein M is an alkali metal ion or an ammonium group and at least 0.1 mol/liter of a water-soluble hydrogen sulfate so that the de-smutting agent is acidic.
Claim 3
Dependent Claim
32 words
The method of claim 1 wherein said de-smutting agent contains at least one of a polyphosphoric acid having two or more phosphorous atoms in the same molecule and a water-soluble neutral salt.
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) | 1979-10-26 | 1980-04-26 | 1980-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-26 | 1984-04-26 | 1984-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-26 | 1988-04-26 | 1988-10-26 | $7700.00 | Window Closed / Lapsed |