US2697660A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of titanium by washing and froth flotation
Assignee: Individual
•
Filing: 1951-04-25
•
Granted: 1954-12-21
•
Expires: 1971-04-25
Abstract
No abstract record available.
Inventors
- 👤 Merle E Sibert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:38
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02; B03D1/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB190413759A
Cited
GB190708567A
Cited
US2205854A
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US2274237A
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US2537068A
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US2553444A
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US2557455A
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US2543407A
Cited
US2543399A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-20 | 1958-06-21 | 1958-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-20 | 1962-06-21 | 1962-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-20 | 1966-06-21 | 1966-12-21 | $7700.00 | Window Closed / Lapsed |