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US2887418A
Expired / Lapsed
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Composition for and method of chrome pickling of magnesium shapes
Assignee: Dow Chemical Co
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Filing: 1956-12-24
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Granted: 1959-05-19
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Expires: 1976-12-24
Abstract
No abstract record available.
Inventors
- 👤 Whitby Lawrence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:53
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/24; C23C22/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
IN A PROCESS OF CHROMATE COATING OF A MAGNESIUM ARTICLE BY SUBJECTING THE ARTICLE TO THE ACTION OF A CHROME PICKLE SOLUTION CONSISTING ESSENTIALLY OF AN AQUEOUS SOLUTION OF NITRIC ACID AND AN ALKALI METAL DICHROMATE THE STEP OF ADMIXING IN SAID CHROME PICKLE SOLUTION BETWEEN 0.01 AND 0.5 PERCENT BY WEIGHT OF A SURFACTANT SELECTED FROM THE CLASS CONSISTING OF ALKYLARYL SULFONATES, ALKYL SULFATES, ALKANESULFONATES, HALO-SUBSTITUTED ALKANE SULFONATES, SULFONATED ESTERS, AND ALKYLARYL POLYETHER SULFONATES.
Claim 2
Dependent Claim
75 words
IN A PROCESS OF CHROMATE COATING OF A MAGNESIUM ARTICLE BY SUBJECTING THE ARTICLE TO THE ACTION OF A CHROME PICKLE SOLUTION CONSISTING ESSENTIALLY OF AN AQUEOUS SOLUTION OF NITRIC ACID AND AN ALKALI METAL DICHROMATE THE STEP OF ADMIXING IN SAID CHROME PICKLE SOLUTION BETWEEN 0.01 AND 0.5 PERCENT BY WEIGHT OF A SURFACTANT SELECTED FROM THE CLASS CONSISTING OF ALKYLARYL SULFONATES, ALKYL SULFATES, ALKANESULFONATES, HALO-SUBSTITUTED ALKANE SULFONATES, SULFONATED ESTERS, AND ALKYLARYL POLYETHER SULFONATES.
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) | 1962-05-18 | 1962-11-17 | 1963-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-18 | 1966-11-17 | 1967-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-18 | 1970-11-17 | 1971-05-19 | $7700.00 | Window Closed / Lapsed |