US3778309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Descaling process for alloys containing chromium
Assignee: Huntington Alloys Corp
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Filing: 1971-06-25
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Granted: 1973-12-11
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Expires: 1991-06-25
Abstract
Abstract PROCESS FOR DESCALLING HIGH CHROMIUM ALLOY MEMBERS IN WHICH THE SCALED ALLOY MEMBERS ARE FIRST PROVIDED WITH A COATING OF SODIUM CARBONATE AND THEN HEATED TO OBTAIN A RECTION BETWEEN THE COATING AND THE SCALE. THE REACTION PRODUCT IS READILY REMOVED FROM THE MEMBERS, AS BY RINSING IN WATER, FOR EXAMPLE, AND THE REMAINING SCALE MAY THEN BE REMOVED BY CONVENTIONAL MEANS, I.E., AN ACID PICKLING BATH.
Inventors
- 👤 Jackson R Pennoyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:02
CPC Classifications
C; C23; C23G; C23G5/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |