US2239370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of metals by distillation
Assignee: Freeport Minerals Corp
•
Filing: 1939-07-15
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Granted: 1941-04-22
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Expires: 1959-07-15
Abstract
No abstract record available.
Inventors
- 👤 William H Osborn
- 👤 Sidney B Tuwiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:30
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/10; B01D3/14; B01D3/16; B01D3/18; B01D3/20; B01D5/00; B01D5/0003; B01D5/0033; B01D5/0036; B01D5/0048; C; C22; C22B; C22B5/00; C22B5/02; C22B5/16
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) | 1944-04-21 | 1944-10-21 | 1945-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-04-21 | 1948-10-21 | 1949-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-04-21 | 1952-10-21 | 1953-04-22 | $7700.00 | Window Closed / Lapsed |