US2471899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of separating constituents of alloys by fractional crystallization
Assignee: Spolek Pro Chemickou A Hutni Vyrobu Narodni Podnik Unite
•
Filing: 1947-03-01
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Granted: 1949-05-31
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Expires: 1967-03-01
Abstract
No abstract record available.
Inventors
- 👤 Regner Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:07
CPC Classifications
C; C22; C22B; C22B7/00; C22B7/001; C22B7/004; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1831023A
Cited
GB540536A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-30 | 1952-11-29 | 1953-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-30 | 1956-11-29 | 1957-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-30 | 1960-11-29 | 1961-05-31 | $7700.00 | Window Closed / Lapsed |