US3004879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brightening and cleaning composition and treatment for magnesium and magnesium-base alloys
Assignee: Dow Chemical Co
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Filing: 1958-11-03
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Granted: 1961-10-17
•
Expires: 1978-11-03
Abstract
No abstract record available.
Inventors
- 👤 Whitby Lawrence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:24
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/22; C11D7/36; C11D7/02; C11D7/04; C11D7/08; C23; C23F; C23F3/00; C23F3/02; C23F3/03
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
81 words
THE METHOD OF CLEANING AND BRIGHTENING THE SURFACES OF A METAL ARTICLE COMPOSED OF AT LEAST 85 PERCENT MAGNESIUM CONSISTING OF ADMIXING BY VOLUME 100 PARTS OF AN ALKYL HYDROGEN ORTHO-PHOSPHATE WITH BETWEEN 10 AND 100 PARTS OF AN AQUEOUS SOLUTION OF NITRIC ACID CONTAINING BETWEEN 52 AND 95 PERCENT BY WEIGHT OF HNO3 AND CONTACTING THE SURFACES OF SAID ARTICLES WITH THE SOLUTION SO MADE, AT A TEMPERATURE OF BETWEEN 15* AND 30* C. FOR BETWEEN 0.5 AND 15 MINUTES.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-16 | 1965-04-17 | 1965-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-16 | 1969-04-17 | 1969-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-16 | 1973-04-17 | 1973-10-17 | $7700.00 | Window Closed / Lapsed |