Patent US2644775A successfully refreshed from Google Patents.
US2644775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of bright annealing and cleaning
Assignee: Occidental Chemical Corp
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Filing: 1950-07-01
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Granted: 1953-07-07
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Expires: 1970-07-01
Abstract
No abstract record available.
Inventors
- 👤 Harry R Spence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:48
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/68; C21D1/70
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
56 words
A PROCESS FOR HEAT TREATING METALLIC ARTICLES COMPRISING SUBJECTING THE METAL TO THE ACTION OF THE FUMES OF A MIXTURE OF SODIUM HYDROXIDE AND SODIUM FLUORIDE, UNTIL A PROTECTIVE COATING OF SAID COMPOSITION IS DEPOSITED ON THE METALLIC SURFACE, ANNEALING THE METAL, AND SUBSEQUENTLY REMOVING THE PROTECTIVE COATING BY QUENCHING THE ARTICLE IN AN AQUEOUS MEDIUM.
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US2237434A
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US2283170A
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US2507314A
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US2477561A
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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) | 1956-07-06 | 1957-01-05 | 1957-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-06 | 1961-01-05 | 1961-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-06 | 1965-01-05 | 1965-07-07 | $7700.00 | Window Closed / Lapsed |