US2861019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromate-coating magnesium and its alloys
Assignee: Dow Chemical Co
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Filing: 1956-06-07
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Granted: 1958-11-18
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Expires: 1976-06-07
Abstract
No abstract record available.
Inventors
- 👤 Long Herbert K De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:44
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
IN A METHOD OF PRODUCING A COATING ON AN ARTICLE COMPOSED OF AT LEAST 85 PERCENT MAGNESIUM, THE STEP WHICH CONSISTS OF SUBJECTING THE ARTICLE, FOR A PERIOD OF BETWEEN 1 AND 5 MINUTES, TO THE ACTION OF AN AQUEOUS SOLUTION AT A PH BETWEEN 0.9 AND 1.8 CONTAINING AS EFFECTIVE CONSTITUENTS BASED UPON THE WEIGHT OF THE SOLUTION BETWEEN ABOUT 0.25 AND 3.0 PERCENT OF CHROMIUM TRIOXIDE AND A SULFATE SELECTED FROM THE CLASS CONSISTING OF AMMONIUM, HYDROGEN AND ALKALI METAL AND ALKALINE EARTH METAL SULFATES IN AN AMOUNT SUFFICIENT TO PROVIDE THE CHEMICAL EQUIVALENT SO4 GROUP CORRESPONDING TO THE SULFATE FRACTION CONTAINED IN 0.1 TO 3.0 PERCENT AMMONIUM SULFATE.
Claim 2
Dependent Claim
111 words
IN A METHOD OF PRODUCING A COATING ON AN ARTICLE COMPOSED OF AT LEAST 85 PERCENT MAGNESIUM, THE STEP WHICH CONSISTS OF SUBJECTING THE ARTICLE, FOR A PERIOD OF BETWEEN 1 AND 5 MINUTES, TO THE ACTION OF AN AQUEOUS SOLUTION AT A PH BETWEEN 0.9 AND 1.8 CONTAINING AS EFFECTIVE CONSTITUENTS BASED UPON THE WEIGHT OF THE SOLUTION BETWEEN ABOUT 0.25 AND 3.0 PERCENT OF CHROMIUM TRIOXIDE AND A SULFATE SELECTED FROM THE CLASS CONSISTING OF AMMONIUM, HYDROGEN AND ALKALI METAL AND ALKALINE EARTH METAL SULFATES IN AN AMOUNT SUFFICIENT TO PROVIDE THE CHEMICAL EQUIVALENT SO4 GROUP CORRESPONDING TO THE SULFATE FRACTION CONTAINED IN 0.1 TO 3.0 PERCENT AMMONIUM SULFATE.
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) | 1961-11-17 | 1962-05-19 | 1962-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-17 | 1966-05-19 | 1966-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-17 | 1970-05-19 | 1970-11-18 | $7700.00 | Window Closed / Lapsed |